[IR] Strawman for dedicated FNeg IR instruction

[cameron.mcinally]

Summary

This is a first whack at a dedicated FNeg IR instruction...

I've over-engineered the UnaryOperator class a little, with the intention of adding more Unary operations in the future. E.g. integer Neg (and maybe Abs, Copysign, etc.).

I don't work on some of these parts of LLVM, so I have some questions for the group. The majority are about reordering enums without breaking public interfaces. I'll comment on this code inline shortly.

Also, changing one of the operator enums appears to have exposed a bug in the MergeFuctions pass. I'll also comment on this inline.

[cameron.mcinally]

include/llvm/Bitcode/LLVMBitCodes.h

346

It wasn't clear to me if it was safe to reorder these values. Any thoughts on this?

479

Same thing here about organizing the enum members.

lib/AsmParser/LLParser.cpp

3322

The lexer/parser is another area that I'm not too familiar with. A thorough review would be appreciated.

lib/Bitcode/Reader/BitcodeReader.cpp

2345

I'm not that familiar with the Bitcode format. Any suggestions on the best way to produce a test case for this? Or is it just the obvious, produce bitcode and make sure it works as expected?

[cameron.mcinally]

include/llvm-c/Core.h

143

Reordering these values appears to have exposed a bug in the MergeFunctions pass (*I think*). It seems that the hash accumulator can overflow with these larger numbers. Although, I could be mistaken.

@dyatkovskiy

[cameron.mcinally]

include/llvm-c/Core.h

143

Ah, sorry. This was the wrong bit of code. Will correct...

include/llvm/IR/Instruction.def

221

Reordering these values appears to have exposed a bug in the MergeFunctions pass (*I think*). It seems that the hash accumulator can overflow with these larger numbers. Although, I could be mistaken.

@dyatkovskiy

[lebedev.ri]

with the intention of adding more Unary operations in the future. E.g. integer Neg (and maybe Abs, Copysign, etc.).

While there are very clear reasons for FNeg to exist, this isn't so true for any of the others listed here..

include/llvm-c/Core.h

66

This strongly suggests that you can not reorder/renumber the existing enumerators.

lib/Bitcode/Writer/BitcodeWriter.cpp

521

There is no integer neg opcode to handle.

[cameron.mcinally]

In D53877#1280756, @lebedev.ri wrote:

with the intention of adding more Unary operations in the future. E.g. integer Neg (and maybe Abs, Copysign, etc.).

While there are very clear reasons for FNeg to exist, this isn't so true for any of the others listed here..

I don't disagree with that. On the other hand, these do seem like common enough operators to justify retiring the intrinsics and creating IR operators for them.

Also, integer Neg may have a stronger case for a dedicated IR instruction than the others. It's currently implemented as -0-x (Sub), which is pretty weird.

lib/Bitcode/Writer/BitcodeWriter.cpp

521

Right, integer Neg is handled the same as FNeg is now. I.e. -0-x (Sub). I'm suggesting that integer Neg should also have a dedicated IR instruction. Although, that case is not as clear cut as it is for FNeg.

[lebedev.ri]

In D53877#1280892, @cameron.mcinally wrote:

In D53877#1280756, @lebedev.ri wrote:

with the intention of adding more Unary operations in the future. E.g. integer Neg (and maybe Abs, Copysign, etc.).

While there are very clear reasons for FNeg to exist, this isn't so true for any of the others listed here..

I don't disagree with that. On the other hand, these do seem like common enough operators to justify retiring the intrinsics and creating IR operators for them.

From what i know, the bar isn't "common enough operator", the bar is more like "too easy to break the existing multi-op pattern".
Funnel shift (rotates) has recently met it, and was added as an operator.
But anyway.

Also, integer Neg may have a stronger case for a dedicated IR instruction than the others. It's currently implemented as -0-x (Sub), which is pretty weird.

[dexonsmith]

include/llvm/Bitcode/LLVMBitCodes.h

346

No. Reordering will break bitcode compatibility.

lib/Bitcode/Reader/BitcodeReader.cpp

2345

New IR we usually test in test/Assembler. You should test double-round-tripping through bitcode (llvm-as | llvm-dis | llvm-as | llvm-dis) and pass through verify-uselistorder. Have a look at existing tests there.

I don't think it applies here, but in cases where you need to upgrade existing bitcode to something new, we check in tiny bitcode files generated with a known released version of llvm and test that it upgrades correctly in test/Bitcode.

[cameron.mcinally]

lib/IR/Verifier.cpp

3011

Just caught this bad copy-and-paste. Will address in next revision...

[arsenm]

Needs some dedicated assembler tests. In particular I would like to see parsing tests with the fast math flags

include/llvm/Bitcode/LLVMBitCodes.h

479

Any guesses for why 14 wasn't used before?

lib/Bitcode/Writer/BitcodeWriter.cpp

521

I would remove this comment. I don't think there's a reason to have an integer neg

[cameron.mcinally]

Updating diff to add test/Assembler tests. This includes both fastmath flags and double-round-tripping tests.

Note that the constant folding test added needs work since FNeg is not currently being folded.

@arsenm @dexonsmith

[cameron.mcinally]

include/llvm/Bitcode/LLVMBitCodes.h

479

It looks like @void removed it as part of the "unwind removal" project. There's not a whole lot of history beyond that attached. The commit is r149911, and the message says:

"[unwind removal] Remove a the obsolete 'unwind' enum value."

That line was the only one that changed in this commit.

[arsenm]

include/llvm-c/Core.h

125

If you're renumbering all of these anyway, might as well fix AddrSpaceCast to be consecutive?

lib/AsmParser/LLParser.cpp

6122–6123

Put these on separate lines?

test/Assembler/fast-math-flags.ll

81

Looks like extra whitespace in the test and output (I would hope this test would use -strict-whitespace, but it looks like this is an issue with the rest of the tests here as well)

[cameron.mcinally]

include/llvm-c/Core.h

125

Ah, forgot about these. Are we all in agreement that it's safe to reorder these values? I don't fully understand the library interactions, so I'm not sure.

I'll go ahead and implement your suggestion. If it turns out it's not safe, I'll revert the change later.

[cameron.mcinally]

Reorder LLVMAddrSpaceCast as @arsenm suggested.

It's still not clear whether it's safe to reorder these values though.

[cameron.mcinally]

test/Assembler/fast-math-flags.ll

81

Created D53981 to correct the general whitespace problem.

[cameron.mcinally]

Remove extra whitespace from test/Assembler/fast-math-flags.ll.

[jyknight]

include/llvm-c/Core.h

66

You should _NOT_ renumber the existing constants in the llvm-c/* APIs. External users are depending on them being stable.

(Adding a comment indicating that while you're in here would be good).

[cameron.mcinally]

include/llvm-c/Core.h

66

That settles it! Thanks, James.

So LLVMAddrSpaceCast is grouped correctly, but the value is out of order. Is that the correct way to add a new member?

Or should I just add FNeg to the end of the list?

[cameron.mcinally]

Don't reorder the members in llvm-c/Core.h as suggested by @jyknight.

[arsenm]

lib/IR/Verifier.cpp

3011

Missing failing verifier tests

[cameron.mcinally]

lib/IR/Verifier.cpp

3011

I'm not familiar with the Verifier tests, so please excuse my naivete...

Is it possible to trip these asserts with llvm-as? It looks like the parser will catch an incorrect type on the operand before we get to these asserts.

[cameron.mcinally]

Add a comment about not reordering the llvm-c/Core.h enum values, as @jyknight suggested.

Sorry, this slipped my mind yesterday...

[cameron.mcinally]

Add newlines to lib/AsmParser/LLParser.cpp, as suggested by @arsenm.

[arsenm]

Bitcode compatibility tests are missing?

[cameron.mcinally]

In D53877#1290637, @arsenm wrote:

Bitcode compatibility tests are missing?

There's some BC coverage with the double-round-tripping test/Assembler tests that were added (I think?).

Could you point me to an example test in test/Bitcode, so that I know what I should be exercising? I don't see many tests that exercise the FP operations. Well, not directly at least.

[arsenm]

In D53877#1290716, @cameron.mcinally wrote:

In D53877#1290637, @arsenm wrote:

Bitcode compatibility tests are missing?

There's some BC coverage with the double-round-tripping test/Assembler tests that were added (I think?).

Could you point me to an example test in test/Bitcode, so that I know what I should be exercising? I don't see many tests that exercise the FP operations. Well, not directly at least.

test/Bitcode/compatibility.ll

[cameron.mcinally]

Ah, I think I see some problems with llvm-bcanalyzer. Will address...

<UnknownCode14 abbrevid=5 op0=1 op1=0/>

[cameron.mcinally]

Add two test/Bitcode tests and address one llvm-bcanalyzer issue, as suggested by @arsenm.

[arsenm]

test/Bitcode/compatibility.ll

1004 ↗

(On Diff #173035)

Should also test the fast math flags since you had to handle those

[cameron.mcinally]

Add bitcode tests for fastmath flags, as @arsenm suggested. Thanks for bearing with me, Matt.

[arsenm]

LGTM

[cameron.mcinally]

Wow, that's great. Thanks, Matt!

It was mentioned earlier, but changing the enum values in Instruction.def appears to have exposed a bug in the MergeFunctions pass. I'll try to work that out with the author(s) of that pass and then commit this (assuming, of course, there are no changes to this patch).

[cameron.mcinally]

Update test/Transforms/MergeFunc/call-and-invoke-with-ranges.ll to account for changes in the Instruction.def enum values.

This test was also touched the last time these enum values were modified, in r255522. So, it appears to just be a fragile test. I'm simply reverting the change to that test from r255522.

Apologies for the last minute revision. This patch now tests cleanly and is ready to land upon approval.

[majnemer]

include/llvm/Bitcode/LLVMBitCodes.h

479

I don't think we should reuse the function code number.

[cameron.mcinally]

Rebase and create new function code number, as suggested by @majnemer.

[cameron.mcinally]

David also gave a LGTM for the call-and-invoke-with-ranges.ll change off-line. If he's okay with the function code number change in LLVMBitCodes.h, I'll go ahead and commit this patch.

Thanks again, David.

[cameron.mcinally]

@majnemer has approved the changes offline. Will commit this patch imminently...

[arsenm]

I just realized the LangRef changes are missing

[cameron.mcinally]

In D53877#1297257, @arsenm wrote:

I just realized the LangRef changes are missing

Bah! I must have inadvertently dropped them at some point along the way. I'll create a new patch now for it...

[cameron.mcinally]

In D53877#1297257, @arsenm wrote:

I just realized the LangRef changes are missing

Just FYI that I am working on this. Our in-house machines don't support the Sphinx package, so I'm having trouble generating the docs. Trying to find a workaround now...

[lebedev.ri]

llvm/trunk/include/llvm-c/Core.h

1523–1524 ↗

(On Diff #173876)

@cameron.mcinally Should anything have been added here for UnaryOperator ?

[lebedev.ri]

llvm/trunk/include/llvm/Bitcode/LLVMBitCodes.h

373 ↗

(On Diff #173876)

@cameron.mcinally also, shouldn't this be UNOP_FNEG?

[cameron.mcinally]

llvm/trunk/include/llvm-c/Core.h

1523–1524 ↗

(On Diff #173876)

Yes, I believe you're correct. Will add that under a separate Diff. Thanks.

llvm/trunk/include/llvm/Bitcode/LLVMBitCodes.h

373 ↗

(On Diff #173876)

I'm not sure. The BINOPs are overloaded for INT/FP types. E.g. BINOP_ADD is also FP. I suppose there are no plans for an INT UNOP_NEG though. Do you feel strongly about this change?

[lebedev.ri]

llvm/trunk/include/llvm/Bitcode/LLVMBitCodes.h

373 ↗

(On Diff #173876)

I don't expect we'll ever have integer neg, so the current UNOP_NEG looks at least inconsistent (you use fneg) elsewhere.
So yes please, let's change this :)

[cameron.mcinally]

llvm/trunk/include/llvm-c/Core.h

1523–1524 ↗

(On Diff #173876)

@lebedev.ri, do you know of any existing tests for these macros? I see a number of uses, but no unittests/etc.

[lebedev.ri]

llvm/trunk/include/llvm-c/Core.h

1523–1524 ↗

(On Diff #173876)

I don't know how this can be reached, but based on the name (LLVMCCoreValues) i can guess this is for C API.

include/llvm-c/Core.h

  */
 
 /**
  * @defgroup LLVMCCoreTypes Types and Enumerations
  *
  * @{
  */
 
+/// External users depend on the following values being stable. It is not safe
+/// to reorder them.
 typedef enum {
   /* Terminator Instructions */
   LLVMRet            = 1,
   LLVMBr             = 2,
   LLVMSwitch         = 3,
   LLVMIndirectBr     = 4,
   LLVMInvoke         = 5,
   /* removed 6 due to API changes */
   LLVMUnreachable    = 7,
 
+  /* Standard Unary Operators */
+  LLVMFNeg           = 66,
+
   /* Standard Binary Operators */
   LLVMAdd            = 8,
   LLVMFAdd           = 9,
   LLVMSub            = 10,
   LLVMFSub           = 11,
   LLVMMul            = 12,
   LLVMFMul           = 13,
   LLVMUDiv           = 14,
typedef enum {
   LLVMFCmp           = 43,
   LLVMPHI            = 44,
   LLVMCall           = 45,
   LLVMSelect         = 46,
   LLVMUserOp1        = 47,
   LLVMUserOp2        = 48,
   LLVMVAArg          = 49,
   LLVMExtractElement = 50,
   LLVMInsertElement  = 51,
   LLVMShuffleVector  = 52,
   LLVMExtractValue   = 53,
   LLVMInsertValue    = 54,
 
   /* Atomic operators */
   LLVMFence          = 55,
   LLVMAtomicCmpXchg  = 56,
   LLVMAtomicRMW      = 57,
 
   /* Exception Handling Operators */
   LLVMResume         = 58,
   LLVMLandingPad     = 59,
   LLVMCleanupRet     = 61,
   LLVMCatchRet       = 62,
   LLVMCatchPad       = 63,
   LLVMCleanupPad     = 64,
   LLVMCatchSwitch    = 65
 } LLVMOpcode;
 
 typedef enum {
   LLVMVoidTypeKind,        /**< type with no size */
   LLVMHalfTypeKind,        /**< 16 bit floating point type */
   LLVMFloatTypeKind,       /**< 32 bit floating point type */
   LLVMDoubleTypeKind,      /**< 64 bit floating point type */
   LLVMX86_FP80TypeKind,    /**< 80 bit floating point type (X87) */
   LLVMFP128TypeKind,       /**< 128 bit floating point type (112-bit mantissa)*/

include/llvm/Bitcode/LLVMBitCodes.h

CST_CODE_INLINEASM_OLD = 18,   // INLINEASM:     [sideeffect|alignstack,
                                  //                 asmstr,conststr]
   CST_CODE_CE_SHUFVEC_EX = 19,   // SHUFVEC_EX:    [opty, opval, opval, opval]
   CST_CODE_CE_INBOUNDS_GEP = 20, // INBOUNDS_GEP:  [n x operands]
   CST_CODE_BLOCKADDRESS = 21,    // CST_CODE_BLOCKADDRESS [fnty, fnval, bb#]
   CST_CODE_DATA = 22,            // DATA:          [n x elements]
   CST_CODE_INLINEASM = 23,       // INLINEASM:     [sideeffect|alignstack|
                                  //                 asmdialect,asmstr,conststr]
   CST_CODE_CE_GEP_WITH_INRANGE_INDEX = 24, //      [opty, flags, n x operands]
+  CST_CODE_CE_UNOP = 25,         // CE_UNOP:      [opcode, opval]
 };
 
 /// CastOpcodes - These are values used in the bitcode files to encode which
 /// cast a CST_CODE_CE_CAST or a XXX refers to.  The values of these enums
 /// have no fixed relation to the LLVM IR enum values.  Changing these will
 /// break compatibility with old files.
 enum CastOpcodes {
   CAST_TRUNC = 0,
   CAST_ZEXT = 1,
   CAST_SEXT = 2,
   CAST_FPTOUI = 3,
   CAST_FPTOSI = 4,
   CAST_UITOFP = 5,
   CAST_SITOFP = 6,
   CAST_FPTRUNC = 7,
   CAST_FPEXT = 8,
   CAST_PTRTOINT = 9,
   CAST_INTTOPTR = 10,
   CAST_BITCAST = 11,
   CAST_ADDRSPACECAST = 12
 };
 
+/// UnaryOpcodes - These are values used in the bitcode files to encode which
+/// unop a CST_CODE_CE_UNOP or a XXX refers to.  The values of these enums
+/// have no fixed relation to the LLVM IR enum values.  Changing these will
+/// break compatibility with old files.
+enum UnaryOpcodes {
+  UNOP_NEG = 0
+};
+
 /// BinaryOpcodes - These are values used in the bitcode files to encode which
 /// binop a CST_CODE_CE_BINOP or a XXX refers to.  The values of these enums
 /// have no fixed relation to the LLVM IR enum values.  Changing these will
 /// break compatibility with old files.
 enum BinaryOpcodes {
   BINOP_ADD = 0,
   BINOP_SUB = 1,
   BINOP_MUL = 2,
enum FunctionCodes {
   FUNC_CODE_INST_INSERTELT = 7,  // INSERTELT:  [ty, opval, opval, opval]
   FUNC_CODE_INST_SHUFFLEVEC = 8, // SHUFFLEVEC: [ty, opval, opval, opval]
   FUNC_CODE_INST_CMP = 9,        // CMP:        [opty, opval, opval, pred]
 
   FUNC_CODE_INST_RET = 10,    // RET:        [opty,opval<both optional>]
   FUNC_CODE_INST_BR = 11,     // BR:         [bb#, bb#, cond] or [bb#]
   FUNC_CODE_INST_SWITCH = 12, // SWITCH:     [opty, op0, op1, ...]
   FUNC_CODE_INST_INVOKE = 13, // INVOKE:     [attr, fnty, op0,op1, ...]
-  // 14 is unused.
+  FUNC_CODE_INST_UNOP = 14,   // UNOP:       [opcode, ty, opval]
   FUNC_CODE_INST_UNREACHABLE = 15, // UNREACHABLE
 
   FUNC_CODE_INST_PHI = 16, // PHI:        [ty, val0,bb0, ...]
   // 17 is unused.
   // 18 is unused.
   FUNC_CODE_INST_ALLOCA = 19, // ALLOCA:     [instty, opty, op, align]
   FUNC_CODE_INST_LOAD = 20,   // LOAD:       [opty, op, align, vol]
   // 21 is unused.
   // 22 is unused.
   FUNC_CODE_INST_VAARG = 23, // VAARG:      [valistty, valist, instty]

include/llvm/CodeGen/GlobalISel/IRTranslator.h

private:
   /// Translate return (ret) instruction.
   /// The target needs to implement CallLowering::lowerReturn for
   /// this to succeed.
   /// \pre \p U is a return instruction.
   bool translateRet(const User &U, MachineIRBuilder &MIRBuilder);
 
   bool translateFSub(const User &U, MachineIRBuilder &MIRBuilder);
 
+  bool translateFNeg(const User &U, MachineIRBuilder &MIRBuilder);
+
   bool translateAdd(const User &U, MachineIRBuilder &MIRBuilder) {
     return translateBinaryOp(TargetOpcode::G_ADD, U, MIRBuilder);
   }
   bool translateSub(const User &U, MachineIRBuilder &MIRBuilder) {
     return translateBinaryOp(TargetOpcode::G_SUB, U, MIRBuilder);
   }
   bool translateAnd(const User &U, MachineIRBuilder &MIRBuilder) {
     return translateBinaryOp(TargetOpcode::G_AND, U, MIRBuilder);

include/llvm/IR/Constants.h

public:
   bool isGEPWithNoNotionalOverIndexing() const;
 
   /// Select constant expr
   ///
   /// \param OnlyIfReducedTy see \a getWithOperands() docs.
   static Constant *getSelect(Constant *C, Constant *V1, Constant *V2,
                              Type *OnlyIfReducedTy = nullptr);
 
+  /// get - Return a unary operator constant expression,
+  /// folding if possible.
+  ///
+  /// \param OnlyIfReducedTy see \a getWithOperands() docs.
+  static Constant *get(unsigned Opcode, Constant *C1, unsigned Flags = 0, 
+                       Type *OnlyIfReducedTy = nullptr);
+
   /// get - Return a binary or shift operator constant expression,
   /// folding if possible.
   ///
   /// \param OnlyIfReducedTy see \a getWithOperands() docs.
   static Constant *get(unsigned Opcode, Constant *C1, Constant *C2,
                        unsigned Flags = 0, Type *OnlyIfReducedTy = nullptr);
 
   /// Return an ICmp or FCmp comparison operator constant expression.

include/llvm/IR/InstVisitor.h

#include "llvm/IR/Instruction.def"
   }
   RetTy visitTerminator(Instruction &I)    { DELEGATE(Instruction);}
 
   // Next level propagators: If the user does not overload a specific
   // instruction type, they can overload one of these to get the whole class
   // of instructions...
   //
   RetTy visitCastInst(CastInst &I)                { DELEGATE(UnaryInstruction);}
+  RetTy visitUnaryOperator(UnaryOperator &I)      { DELEGATE(UnaryInstruction);}
   RetTy visitBinaryOperator(BinaryOperator &I)    { DELEGATE(Instruction);}
   RetTy visitCmpInst(CmpInst &I)                  { DELEGATE(Instruction);}
   RetTy visitUnaryInstruction(UnaryInstruction &I){ DELEGATE(Instruction);}
 
   // Provide a special visitor for a 'callsite' that visits both calls and
   // invokes. When unimplemented, properly delegates to either the terminator or
   // regular instruction visitor.
   RetTy visitCallSite(CallSite CS) {

include/llvm/IR/Instruction.h

public:
   // Subclass classification.
   //===--------------------------------------------------------------------===//
 
   /// Returns a member of one of the enums like Instruction::Add.
   unsigned getOpcode() const { return getValueID() - InstructionVal; }
 
   const char *getOpcodeName() const { return getOpcodeName(getOpcode()); }
   bool isTerminator() const { return isTerminator(getOpcode()); }
+  bool isUnaryOp() const { return isUnaryOp(getOpcode()); }
   bool isBinaryOp() const { return isBinaryOp(getOpcode()); }
   bool isIntDivRem() const { return isIntDivRem(getOpcode()); }
   bool isShift() { return isShift(getOpcode()); }
   bool isCast() const { return isCast(getOpcode()); }
   bool isFuncletPad() const { return isFuncletPad(getOpcode()); }
   bool isExceptionalTerminator() const {
     return isExceptionalTerminator(getOpcode());
   }
 
   static const char* getOpcodeName(unsigned OpCode);
 
   static inline bool isTerminator(unsigned OpCode) {
     return OpCode >= TermOpsBegin && OpCode < TermOpsEnd;
   }
 
+  static inline bool isUnaryOp(unsigned Opcode) {
+    return Opcode >= UnaryOpsBegin && Opcode < UnaryOpsEnd;
+  }
   static inline bool isBinaryOp(unsigned Opcode) {
     return Opcode >= BinaryOpsBegin && Opcode < BinaryOpsEnd;
   }
 
   static inline bool isIntDivRem(unsigned Opcode) {
     return Opcode == UDiv || Opcode == SDiv || Opcode == URem || Opcode == SRem;
   }
 
public:
   //
   enum TermOps {       // These terminate basic blocks
 #define  FIRST_TERM_INST(N)             TermOpsBegin = N,
 #define HANDLE_TERM_INST(N, OPC, CLASS) OPC = N,
 #define   LAST_TERM_INST(N)             TermOpsEnd = N+1
 #include "llvm/IR/Instruction.def"
   };
 
+  enum UnaryOps {
+#define  FIRST_UNARY_INST(N)             UnaryOpsBegin = N,
+#define HANDLE_UNARY_INST(N, OPC, CLASS) OPC = N,
+#define   LAST_UNARY_INST(N)             UnaryOpsEnd = N+1
+#include "llvm/IR/Instruction.def"
+  };
+
   enum BinaryOps {
 #define  FIRST_BINARY_INST(N)             BinaryOpsBegin = N,
 #define HANDLE_BINARY_INST(N, OPC, CLASS) OPC = N,
 #define   LAST_BINARY_INST(N)             BinaryOpsEnd = N+1
 #include "llvm/IR/Instruction.def"
   };
 
   enum MemoryOps {

include/llvm/IR/Instruction.def

 #else
 #define HANDLE_TERM_INST(num, opcode, Class) HANDLE_INST(num, opcode, Class)
 #endif
 #endif
 #ifndef LAST_TERM_INST
 #define LAST_TERM_INST(num)
 #endif
 
+#ifndef FIRST_UNARY_INST
+#define FIRST_UNARY_INST(num)
+#endif
+#ifndef HANDLE_UNARY_INST
+#ifndef HANDLE_INST
+#define HANDLE_UNARY_INST(num, opcode, instclass)
+#else
+#define HANDLE_UNARY_INST(num, opcode, Class) HANDLE_INST(num, opcode, Class)
+#endif
+#endif
+#ifndef LAST_UNARY_INST
+#define LAST_UNARY_INST(num)
+#endif
+
 #ifndef FIRST_BINARY_INST
 #define FIRST_BINARY_INST(num)
 #endif
 #ifndef HANDLE_BINARY_INST
 #ifndef HANDLE_INST
 #define HANDLE_BINARY_INST(num, opcode, instclass)
 #else
 #define HANDLE_BINARY_INST(num, opcode, Class) HANDLE_INST(num, opcode, Class)

 HANDLE_TERM_INST  ( 5, Invoke        , InvokeInst)
 HANDLE_TERM_INST  ( 6, Resume        , ResumeInst)
 HANDLE_TERM_INST  ( 7, Unreachable   , UnreachableInst)
 HANDLE_TERM_INST  ( 8, CleanupRet    , CleanupReturnInst)
 HANDLE_TERM_INST  ( 9, CatchRet      , CatchReturnInst)
 HANDLE_TERM_INST  (10, CatchSwitch   , CatchSwitchInst)
   LAST_TERM_INST  (10)
 
+// Standard unary operators...
+ FIRST_UNARY_INST(11)
+HANDLE_UNARY_INST(11, FNeg  , UnaryOperator)
+  LAST_UNARY_INST(11)
+
 // Standard binary operators...
- FIRST_BINARY_INST(11)
-HANDLE_BINARY_INST(11, Add  , BinaryOperator)
-HANDLE_BINARY_INST(12, FAdd , BinaryOperator)
-HANDLE_BINARY_INST(13, Sub  , BinaryOperator)
-HANDLE_BINARY_INST(14, FSub , BinaryOperator)
-HANDLE_BINARY_INST(15, Mul  , BinaryOperator)
-HANDLE_BINARY_INST(16, FMul , BinaryOperator)
-HANDLE_BINARY_INST(17, UDiv , BinaryOperator)
-HANDLE_BINARY_INST(18, SDiv , BinaryOperator)
-HANDLE_BINARY_INST(19, FDiv , BinaryOperator)
-HANDLE_BINARY_INST(20, URem , BinaryOperator)
-HANDLE_BINARY_INST(21, SRem , BinaryOperator)
-HANDLE_BINARY_INST(22, FRem , BinaryOperator)
+ FIRST_BINARY_INST(12)
+HANDLE_BINARY_INST(12, Add  , BinaryOperator)
+HANDLE_BINARY_INST(13, FAdd , BinaryOperator)
+HANDLE_BINARY_INST(14, Sub  , BinaryOperator)
+HANDLE_BINARY_INST(15, FSub , BinaryOperator)
+HANDLE_BINARY_INST(16, Mul  , BinaryOperator)
+HANDLE_BINARY_INST(17, FMul , BinaryOperator)
+HANDLE_BINARY_INST(18, UDiv , BinaryOperator)
+HANDLE_BINARY_INST(19, SDiv , BinaryOperator)
+HANDLE_BINARY_INST(20, FDiv , BinaryOperator)
+HANDLE_BINARY_INST(21, URem , BinaryOperator)
+HANDLE_BINARY_INST(22, SRem , BinaryOperator)
+HANDLE_BINARY_INST(23, FRem , BinaryOperator)
 
 // Logical operators (integer operands)
-HANDLE_BINARY_INST(23, Shl  , BinaryOperator) // Shift left  (logical)
-HANDLE_BINARY_INST(24, LShr , BinaryOperator) // Shift right (logical)
-HANDLE_BINARY_INST(25, AShr , BinaryOperator) // Shift right (arithmetic)
-HANDLE_BINARY_INST(26, And  , BinaryOperator)
-HANDLE_BINARY_INST(27, Or   , BinaryOperator)
-HANDLE_BINARY_INST(28, Xor  , BinaryOperator)
-  LAST_BINARY_INST(28)
+HANDLE_BINARY_INST(24, Shl  , BinaryOperator) // Shift left  (logical)
+HANDLE_BINARY_INST(25, LShr , BinaryOperator) // Shift right (logical)
+HANDLE_BINARY_INST(26, AShr , BinaryOperator) // Shift right (arithmetic)
+HANDLE_BINARY_INST(27, And  , BinaryOperator)
+HANDLE_BINARY_INST(28, Or   , BinaryOperator)
+HANDLE_BINARY_INST(29, Xor  , BinaryOperator)
+  LAST_BINARY_INST(29)
 
 // Memory operators...
- FIRST_MEMORY_INST(29)
-HANDLE_MEMORY_INST(29, Alloca, AllocaInst)  // Stack management
-HANDLE_MEMORY_INST(30, Load  , LoadInst  )  // Memory manipulation instrs
-HANDLE_MEMORY_INST(31, Store , StoreInst )
-HANDLE_MEMORY_INST(32, GetElementPtr, GetElementPtrInst)
-HANDLE_MEMORY_INST(33, Fence , FenceInst )
-HANDLE_MEMORY_INST(34, AtomicCmpXchg , AtomicCmpXchgInst )
-HANDLE_MEMORY_INST(35, AtomicRMW , AtomicRMWInst )
-  LAST_MEMORY_INST(35)
+ FIRST_MEMORY_INST(30)
+HANDLE_MEMORY_INST(30, Alloca, AllocaInst)  // Stack management
+HANDLE_MEMORY_INST(31, Load  , LoadInst  )  // Memory manipulation instrs
+HANDLE_MEMORY_INST(32, Store , StoreInst )
+HANDLE_MEMORY_INST(33, GetElementPtr, GetElementPtrInst)
+HANDLE_MEMORY_INST(34, Fence , FenceInst )
+HANDLE_MEMORY_INST(35, AtomicCmpXchg , AtomicCmpXchgInst )
+HANDLE_MEMORY_INST(36, AtomicRMW , AtomicRMWInst )
+  LAST_MEMORY_INST(36)
 
 // Cast operators ...
 // NOTE: The order matters here because CastInst::isEliminableCastPair
 // NOTE: (see Instructions.cpp) encodes a table based on this ordering.
- FIRST_CAST_INST(36)
-HANDLE_CAST_INST(36, Trunc   , TruncInst   )  // Truncate integers
-HANDLE_CAST_INST(37, ZExt    , ZExtInst    )  // Zero extend integers
-HANDLE_CAST_INST(38, SExt    , SExtInst    )  // Sign extend integers
-HANDLE_CAST_INST(39, FPToUI  , FPToUIInst  )  // floating point -> UInt
-HANDLE_CAST_INST(40, FPToSI  , FPToSIInst  )  // floating point -> SInt
-HANDLE_CAST_INST(41, UIToFP  , UIToFPInst  )  // UInt -> floating point
-HANDLE_CAST_INST(42, SIToFP  , SIToFPInst  )  // SInt -> floating point
-HANDLE_CAST_INST(43, FPTrunc , FPTruncInst )  // Truncate floating point
-HANDLE_CAST_INST(44, FPExt   , FPExtInst   )  // Extend floating point
-HANDLE_CAST_INST(45, PtrToInt, PtrToIntInst)  // Pointer -> Integer
-HANDLE_CAST_INST(46, IntToPtr, IntToPtrInst)  // Integer -> Pointer
-HANDLE_CAST_INST(47, BitCast , BitCastInst )  // Type cast
-HANDLE_CAST_INST(48, AddrSpaceCast, AddrSpaceCastInst)  // addrspace cast
-  LAST_CAST_INST(48)
-
- FIRST_FUNCLETPAD_INST(49)
-HANDLE_FUNCLETPAD_INST(49, CleanupPad, CleanupPadInst)
-HANDLE_FUNCLETPAD_INST(50, CatchPad  , CatchPadInst)
-  LAST_FUNCLETPAD_INST(50)
+ FIRST_CAST_INST(37)
+HANDLE_CAST_INST(37, Trunc   , TruncInst   )  // Truncate integers
+HANDLE_CAST_INST(38, ZExt    , ZExtInst    )  // Zero extend integers
+HANDLE_CAST_INST(39, SExt    , SExtInst    )  // Sign extend integers
+HANDLE_CAST_INST(40, FPToUI  , FPToUIInst  )  // floating point -> UInt
+HANDLE_CAST_INST(41, FPToSI  , FPToSIInst  )  // floating point -> SInt
+HANDLE_CAST_INST(42, UIToFP  , UIToFPInst  )  // UInt -> floating point
+HANDLE_CAST_INST(43, SIToFP  , SIToFPInst  )  // SInt -> floating point
+HANDLE_CAST_INST(44, FPTrunc , FPTruncInst )  // Truncate floating point
+HANDLE_CAST_INST(45, FPExt   , FPExtInst   )  // Extend floating point
+HANDLE_CAST_INST(46, PtrToInt, PtrToIntInst)  // Pointer -> Integer
+HANDLE_CAST_INST(47, IntToPtr, IntToPtrInst)  // Integer -> Pointer
+HANDLE_CAST_INST(48, BitCast , BitCastInst )  // Type cast
+HANDLE_CAST_INST(49, AddrSpaceCast, AddrSpaceCastInst)  // addrspace cast
+  LAST_CAST_INST(49)
+
+ FIRST_FUNCLETPAD_INST(50)
+HANDLE_FUNCLETPAD_INST(50, CleanupPad, CleanupPadInst)
+HANDLE_FUNCLETPAD_INST(51, CatchPad  , CatchPadInst)
+  LAST_FUNCLETPAD_INST(51)
 
 // Other operators...
- FIRST_OTHER_INST(51)
-HANDLE_OTHER_INST(51, ICmp   , ICmpInst   )  // Integer comparison instruction
-HANDLE_OTHER_INST(52, FCmp   , FCmpInst   )  // Floating point comparison instr.
-HANDLE_OTHER_INST(53, PHI    , PHINode    )  // PHI node instruction
-HANDLE_OTHER_INST(54, Call   , CallInst   )  // Call a function
-HANDLE_OTHER_INST(55, Select , SelectInst )  // select instruction
-HANDLE_USER_INST (56, UserOp1, Instruction)  // May be used internally in a pass
-HANDLE_USER_INST (57, UserOp2, Instruction)  // Internal to passes only
-HANDLE_OTHER_INST(58, VAArg  , VAArgInst  )  // vaarg instruction
-HANDLE_OTHER_INST(59, ExtractElement, ExtractElementInst)// extract from vector
-HANDLE_OTHER_INST(60, InsertElement, InsertElementInst)  // insert into vector
-HANDLE_OTHER_INST(61, ShuffleVector, ShuffleVectorInst)  // shuffle two vectors.
-HANDLE_OTHER_INST(62, ExtractValue, ExtractValueInst)// extract from aggregate
-HANDLE_OTHER_INST(63, InsertValue, InsertValueInst)  // insert into aggregate
-HANDLE_OTHER_INST(64, LandingPad, LandingPadInst)  // Landing pad instruction.
-  LAST_OTHER_INST(64)
+ FIRST_OTHER_INST(52)
+HANDLE_OTHER_INST(52, ICmp   , ICmpInst   )  // Integer comparison instruction
+HANDLE_OTHER_INST(53, FCmp   , FCmpInst   )  // Floating point comparison instr.
+HANDLE_OTHER_INST(54, PHI    , PHINode    )  // PHI node instruction
+HANDLE_OTHER_INST(55, Call   , CallInst   )  // Call a function
+HANDLE_OTHER_INST(56, Select , SelectInst )  // select instruction
+HANDLE_USER_INST (57, UserOp1, Instruction)  // May be used internally in a pass
+HANDLE_USER_INST (58, UserOp2, Instruction)  // Internal to passes only
+HANDLE_OTHER_INST(59, VAArg  , VAArgInst  )  // vaarg instruction
+HANDLE_OTHER_INST(60, ExtractElement, ExtractElementInst)// extract from vector
+HANDLE_OTHER_INST(61, InsertElement, InsertElementInst)  // insert into vector
+HANDLE_OTHER_INST(62, ShuffleVector, ShuffleVectorInst)  // shuffle two vectors.
+HANDLE_OTHER_INST(63, ExtractValue, ExtractValueInst)// extract from aggregate
+HANDLE_OTHER_INST(64, InsertValue, InsertValueInst)  // insert into aggregate
+HANDLE_OTHER_INST(65, LandingPad, LandingPadInst)  // Landing pad instruction.
+  LAST_OTHER_INST(65)
 
 #undef  FIRST_TERM_INST
 #undef HANDLE_TERM_INST
 #undef   LAST_TERM_INST
 
+#undef  FIRST_UNARY_INST
+#undef HANDLE_UNARY_INST
+#undef   LAST_UNARY_INST
+
 #undef  FIRST_BINARY_INST
 #undef HANDLE_BINARY_INST
 #undef   LAST_BINARY_INST
 
 #undef  FIRST_MEMORY_INST
 #undef HANDLE_MEMORY_INST
 #undef   LAST_MEMORY_INST
 

include/llvm/IR/Instructions.h

GetElementPtrInst::GetElementPtrInst(Type *PointeeType, Value *Ptr,
   assert(ResultElementType ==
          cast<PointerType>(getType()->getScalarType())->getElementType());
   init(Ptr, IdxList, NameStr);
 }
 
 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GetElementPtrInst, Value)
 
 //===----------------------------------------------------------------------===//
+//                                UnaryOperator Class
+//===----------------------------------------------------------------------===//
+
+/// a unary instruction 
+class UnaryOperator : public UnaryInstruction {
+  void AssertOK();
+
+protected:
+  UnaryOperator(UnaryOps iType, Value *S, Type *Ty,
+                const Twine &Name, Instruction *InsertBefore);
+  UnaryOperator(UnaryOps iType, Value *S, Type *Ty,
+                const Twine &Name, BasicBlock *InsertAtEnd);
+
+  // Note: Instruction needs to be a friend here to call cloneImpl.
+  friend class Instruction;
+
+  UnaryOperator *cloneImpl() const;
+
+public:
+
+  /// Construct a unary instruction, given the opcode and an operand.
+  /// Optionally (if InstBefore is specified) insert the instruction
+  /// into a BasicBlock right before the specified instruction.  The specified
+  /// Instruction is allowed to be a dereferenced end iterator.
+  ///
+  static UnaryOperator *Create(UnaryOps Op, Value *S,
+                               const Twine &Name = Twine(),
+                               Instruction *InsertBefore = nullptr);
+
+  /// Construct a unary instruction, given the opcode and an operand.
+  /// Also automatically insert this instruction to the end of the
+  /// BasicBlock specified.
+  ///
+  static UnaryOperator *Create(UnaryOps Op, Value *S,
+                               const Twine &Name,
+                               BasicBlock *InsertAtEnd);
+
+  /// These methods just forward to Create, and are useful when you
+  /// statically know what type of instruction you're going to create.  These
+  /// helpers just save some typing.
+#define HANDLE_UNARY_INST(N, OPC, CLASS) \
+  static UnaryInstruction *Create##OPC(Value *V, \
+                                       const Twine &Name = "") {\
+    return Create(Instruction::OPC, V, Name);\
+  }
+#include "llvm/IR/Instruction.def"
+#define HANDLE_UNARY_INST(N, OPC, CLASS) \
+  static UnaryInstruction *Create##OPC(Value *V, \
+                                       const Twine &Name, BasicBlock *BB) {\
+    return Create(Instruction::OPC, V, Name, BB);\
+  }
+#include "llvm/IR/Instruction.def"
+#define HANDLE_UNARY_INST(N, OPC, CLASS) \
+  static UnaryInstruction *Create##OPC(Value *V, \
+                                       const Twine &Name, Instruction *I) {\
+    return Create(Instruction::OPC, V, Name, I);\
+  }
+#include "llvm/IR/Instruction.def"
+
+  UnaryOps getOpcode() const {
+    return static_cast<UnaryOps>(Instruction::getOpcode());
+  }
+};
+
+//===----------------------------------------------------------------------===//
 //                               ICmpInst Class
 //===----------------------------------------------------------------------===//
 
 /// This instruction compares its operands according to the predicate given
 /// to the constructor. It only operates on integers or pointers. The operands
 /// must be identical types.
 /// Represent an integer comparison operator.
 class ICmpInst: public CmpInst {

lib/AsmParser/LLLexer.cpp

 #define INSTKEYWORD(STR, Enum)                                                 \
   do {                                                                         \
     if (Keyword == #STR) {                                                     \
       UIntVal = Instruction::Enum;                                             \
       return lltok::kw_##STR;                                                  \
     }                                                                          \
   } while (false)
 
+  INSTKEYWORD(fneg,  FNeg);
+
   INSTKEYWORD(add,   Add);  INSTKEYWORD(fadd,   FAdd);
   INSTKEYWORD(sub,   Sub);  INSTKEYWORD(fsub,   FSub);
   INSTKEYWORD(mul,   Mul);  INSTKEYWORD(fmul,   FMul);
   INSTKEYWORD(udiv,  UDiv); INSTKEYWORD(sdiv,  SDiv); INSTKEYWORD(fdiv,  FDiv);
   INSTKEYWORD(urem,  URem); INSTKEYWORD(srem,  SRem); INSTKEYWORD(frem,  FRem);
   INSTKEYWORD(shl,   Shl);  INSTKEYWORD(lshr,  LShr); INSTKEYWORD(ashr,  AShr);
   INSTKEYWORD(and,   And);  INSTKEYWORD(or,    Or);   INSTKEYWORD(xor,   Xor);
   INSTKEYWORD(icmp,  ICmp); INSTKEYWORD(fcmp,  FCmp);

lib/AsmParser/LLParser.h

#include "llvm/IR/Metadata.def"
     bool ParseInvoke(Instruction *&Inst, PerFunctionState &PFS);
     bool ParseResume(Instruction *&Inst, PerFunctionState &PFS);
     bool ParseCleanupRet(Instruction *&Inst, PerFunctionState &PFS);
     bool ParseCatchRet(Instruction *&Inst, PerFunctionState &PFS);
     bool ParseCatchSwitch(Instruction *&Inst, PerFunctionState &PFS);
     bool ParseCatchPad(Instruction *&Inst, PerFunctionState &PFS);
     bool ParseCleanupPad(Instruction *&Inst, PerFunctionState &PFS);
 
+    bool ParseUnaryOp(Instruction *&Inst, PerFunctionState &PFS, unsigned Opc,
+                      unsigned OperandType);
     bool ParseArithmetic(Instruction *&Inst, PerFunctionState &PFS, unsigned Opc,
                          unsigned OperandType);
     bool ParseLogical(Instruction *&Inst, PerFunctionState &PFS, unsigned Opc);
     bool ParseCompare(Instruction *&Inst, PerFunctionState &PFS, unsigned Opc);
     bool ParseCast(Instruction *&Inst, PerFunctionState &PFS, unsigned Opc);
     bool ParseSelect(Instruction *&Inst, PerFunctionState &PFS);
     bool ParseVA_Arg(Instruction *&Inst, PerFunctionState &PFS);
     bool ParseExtractElement(Instruction *&Inst, PerFunctionState &PFS);

lib/AsmParser/LLParser.cpp

if (Opc == Instruction::FCmp) {
       if (!Val0->getType()->isIntOrIntVectorTy() &&
           !Val0->getType()->isPtrOrPtrVectorTy())
         return Error(ID.Loc, "icmp requires pointer or integer operands");
       ID.ConstantVal = ConstantExpr::getICmp(Pred, Val0, Val1);
     }
     ID.Kind = ValID::t_Constant;
     return false;
   }
  
+  // Unary Operators.
+  case lltok::kw_fneg: {
+    unsigned Opc = Lex.getUIntVal();
+    Constant *Val;
+    Lex.Lex();
+    if (ParseToken(lltok::lparen, "expected '(' in unary constantexpr") ||
+        ParseGlobalTypeAndValue(Val) ||
+        ParseToken(lltok::rparen, "expected ')' in unary constantexpr"))
+      return true;
+    
+    // Check that the type is valid for the operator.
+    switch (Opc) {
+    case Instruction::FNeg:
+      if (!Val->getType()->isFPOrFPVectorTy())
+        return Error(ID.Loc, "constexpr requires fp operands");
+      break;
+    default: llvm_unreachable("Unknown unary operator!");
+    }
+    unsigned Flags = 0;
+    Constant *C = ConstantExpr::get(Opc, Val, Flags);
+    ID.ConstantVal = C;
+    ID.Kind = ValID::t_Constant;
+    return false;
+  }
   // Binary Operators.
   case lltok::kw_add:
   case lltok::kw_fadd:
   case lltok::kw_sub:
   case lltok::kw_fsub:
   case lltok::kw_mul:
   case lltok::kw_fmul:
   case lltok::kw_udiv:
int LLParser::ParseInstruction(Instruction *&Inst, BasicBlock *BB,
   case lltok::kw_indirectbr:  return ParseIndirectBr(Inst, PFS);
   case lltok::kw_invoke:      return ParseInvoke(Inst, PFS);
   case lltok::kw_resume:      return ParseResume(Inst, PFS);
   case lltok::kw_cleanupret:  return ParseCleanupRet(Inst, PFS);
   case lltok::kw_catchret:    return ParseCatchRet(Inst, PFS);
   case lltok::kw_catchswitch: return ParseCatchSwitch(Inst, PFS);
   case lltok::kw_catchpad:    return ParseCatchPad(Inst, PFS);
   case lltok::kw_cleanuppad:  return ParseCleanupPad(Inst, PFS);
+  // Unary Operators.
+  case lltok::kw_fneg: {
+    FastMathFlags FMF = EatFastMathFlagsIfPresent();
+    int Res = ParseUnaryOp(Inst, PFS, KeywordVal, 2);
+    if (Res != 0)
+      return Res;
+    if (FMF.any())
+      Inst->setFastMathFlags(FMF);
+    return false;
+  }
   // Binary Operators.
   case lltok::kw_add:
   case lltok::kw_sub:
   case lltok::kw_mul:
   case lltok::kw_shl: {
     bool NUW = EatIfPresent(lltok::kw_nuw);
     bool NSW = EatIfPresent(lltok::kw_nsw);
     if (!NUW) NUW = EatIfPresent(lltok::kw_nuw);
bool LLParser::ParseCleanupPad(Instruction *&Inst, PerFunctionState &PFS) {
   if (ParseExceptionArgs(Args, PFS))
     return true;
 
   Inst = CleanupPadInst::Create(ParentPad, Args);
   return false;
 }
 
 //===----------------------------------------------------------------------===//
+// Unary Operators.
+//===----------------------------------------------------------------------===//
+
+/// ParseUnaryOp
+///  ::= UnaryOp TypeAndValue ',' Value
+///
+/// If OperandType is 0, then any FP or integer operand is allowed.  If it is 1,
+/// then any integer operand is allowed, if it is 2, any fp operand is allowed.
+bool LLParser::ParseUnaryOp(Instruction *&Inst, PerFunctionState &PFS,
+                            unsigned Opc, unsigned OperandType) {
+  LocTy Loc; Value *LHS;
+  if (ParseTypeAndValue(LHS, Loc, PFS))
+    return true;
+
+  bool Valid;
+  switch (OperandType) {
+  default: llvm_unreachable("Unknown operand type!");
+  case 0: // int or FP.
+    Valid = LHS->getType()->isIntOrIntVectorTy() ||
+            LHS->getType()->isFPOrFPVectorTy();
+    break;
+  case 1: Valid = LHS->getType()->isIntOrIntVectorTy(); break;
+  case 2: Valid = LHS->getType()->isFPOrFPVectorTy(); break;
+  }
+
+  if (!Valid)
+    return Error(Loc, "invalid operand type for instruction");
+
+  Inst = UnaryOperator::Create((Instruction::UnaryOps)Opc, LHS);
+  return false;
+}
+
+//===----------------------------------------------------------------------===//
 // Binary Operators.
 //===----------------------------------------------------------------------===//
 
 /// ParseArithmetic
 ///  ::= ArithmeticOps TypeAndValue ',' Value
 ///
 /// If OperandType is 0, then any FP or integer operand is allowed.  If it is 1,
 /// then any integer operand is allowed, if it is 2, any fp operand is allowed.

lib/AsmParser/LLToken.h

enum Kind {
   kw_xchg,
   kw_nand,
   kw_max,
   kw_min,
   kw_umax,
   kw_umin,
 
   // Instruction Opcodes (Opcode in UIntVal).
+  kw_fneg,
   kw_add,
   kw_fadd,
   kw_sub,
   kw_fsub,
   kw_mul,
   kw_fmul,
   kw_udiv,
   kw_sdiv,

lib/Bitcode/Reader/BitcodeReader.cpp

static int getDecodedCastOpcode(unsigned Val) {
   case bitc::CAST_FPEXT   : return Instruction::FPExt;
   case bitc::CAST_PTRTOINT: return Instruction::PtrToInt;
   case bitc::CAST_INTTOPTR: return Instruction::IntToPtr;
   case bitc::CAST_BITCAST : return Instruction::BitCast;
   case bitc::CAST_ADDRSPACECAST: return Instruction::AddrSpaceCast;
   }
 }
 
+static int getDecodedUnaryOpcode(unsigned Val, Type *Ty) {
+  bool IsFP = Ty->isFPOrFPVectorTy();
+  // UnOps are only valid for int/fp or vector of int/fp types
+  if (!IsFP && !Ty->isIntOrIntVectorTy())
+    return -1;
+
+  switch (Val) {
+  default:
+    return -1;
+  case bitc::UNOP_NEG:
+    return IsFP ? Instruction::FNeg : -1;
+  }
+}
+
 static int getDecodedBinaryOpcode(unsigned Val, Type *Ty) {
   bool IsFP = Ty->isFPOrFPVectorTy();
   // BinOps are only valid for int/fp or vector of int/fp types
   if (!IsFP && !Ty->isIntOrIntVectorTy())
     return -1;
 
   switch (Val) {
   default:
case bitc::CST_CODE_DATA: {// DATA: [n x value]
           V = ConstantDataVector::getFP(Context, Elts);
         else
           V = ConstantDataArray::getFP(Context, Elts);
       } else {
         return error("Invalid type for value");
       }
       break;
     }
+    case bitc::CST_CODE_CE_UNOP: {  // CE_UNOP: [opcode, opval]
+      if (Record.size() < 2)
+        return error("Invalid record");
+      int Opc = getDecodedUnaryOpcode(Record[0], CurTy);
+      if (Opc < 0) {
+        V = UndefValue::get(CurTy);  // Unknown unop.
+      } else {
+        Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy);
+        unsigned Flags = 0;
+        V = ConstantExpr::get(Opc, LHS, Flags);
+      }
+      break;
+    }
     case bitc::CST_CODE_CE_BINOP: {  // CE_BINOP: [opcode, opval, opval]
       if (Record.size() < 3)
         return error("Invalid record");
       int Opc = getDecodedBinaryOpcode(Record[0], CurTy);
       if (Opc < 0) {
         V = UndefValue::get(CurTy);  // Unknown binop.
       } else {
         Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy);
case bitc::FUNC_CODE_DEBUG_LOC: {      // DEBUG_LOC: [line, col, scope, ia]
         if (!IA)
           return error("Invalid record");
       }
       LastLoc = DebugLoc::get(Line, Col, Scope, IA, isImplicitCode);
       I->setDebugLoc(LastLoc);
       I = nullptr;
       continue;
     }
+    case bitc::FUNC_CODE_INST_UNOP: {    // UNOP: [opval, ty, opcode]
+      unsigned OpNum = 0;
+      Value *LHS;
+      if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
+          OpNum+1 > Record.size())
+        return error("Invalid record");
 
+      int Opc = getDecodedUnaryOpcode(Record[OpNum++], LHS->getType());
+      if (Opc == -1)
+        return error("Invalid record");
+      I = UnaryOperator::Create((Instruction::UnaryOps)Opc, LHS);
+      InstructionList.push_back(I);
+      if (OpNum < Record.size()) {
+        if (isa<FPMathOperator>(I)) {
+          FastMathFlags FMF = getDecodedFastMathFlags(Record[OpNum]);
+          if (FMF.any())
+            I->setFastMathFlags(FMF);
+        }
+      }
+      break;
+    }
     case bitc::FUNC_CODE_INST_BINOP: {    // BINOP: [opval, ty, opval, opcode]
       unsigned OpNum = 0;
       Value *LHS, *RHS;
       if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
           popValue(Record, OpNum, NextValueNo, LHS->getType(), RHS) ||
           OpNum+1 > Record.size())
         return error("Invalid record");
 

lib/Bitcode/Writer/BitcodeWriter.cpp

enum {
   // CONSTANTS_BLOCK abbrev id's.
   CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
   CONSTANTS_INTEGER_ABBREV,
   CONSTANTS_CE_CAST_Abbrev,
   CONSTANTS_NULL_Abbrev,
 
   // FUNCTION_BLOCK abbrev id's.
   FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
+  FUNCTION_INST_UNOP_ABBREV,
+  FUNCTION_INST_UNOP_FLAGS_ABBREV,
   FUNCTION_INST_BINOP_ABBREV,
   FUNCTION_INST_BINOP_FLAGS_ABBREV,
   FUNCTION_INST_CAST_ABBREV,
   FUNCTION_INST_RET_VOID_ABBREV,
   FUNCTION_INST_RET_VAL_ABBREV,
   FUNCTION_INST_UNREACHABLE_ABBREV,
   FUNCTION_INST_GEP_ABBREV,
 };
static unsigned getEncodedCastOpcode(unsigned Opcode) {
   case Instruction::FPExt   : return bitc::CAST_FPEXT;
   case Instruction::PtrToInt: return bitc::CAST_PTRTOINT;
   case Instruction::IntToPtr: return bitc::CAST_INTTOPTR;
   case Instruction::BitCast : return bitc::CAST_BITCAST;
   case Instruction::AddrSpaceCast: return bitc::CAST_ADDRSPACECAST;
   }
 }
 
+static unsigned getEncodedUnaryOpcode(unsigned Opcode) {
+  switch (Opcode) {
+  default: llvm_unreachable("Unknown binary instruction!");
+  case Instruction::FNeg: return bitc::UNOP_NEG;
+  }
+}
+
 static unsigned getEncodedBinaryOpcode(unsigned Opcode) {
   switch (Opcode) {
   default: llvm_unreachable("Unknown binary instruction!");
   case Instruction::Add:
   case Instruction::FAdd: return bitc::BINOP_ADD;
   case Instruction::Sub:
   case Instruction::FSub: return bitc::BINOP_SUB;
   case Instruction::Mul:
if (C->isNullValue()) {
           Record.push_back(getEncodedBinaryOpcode(CE->getOpcode()));
           Record.push_back(VE.getValueID(C->getOperand(0)));
           Record.push_back(VE.getValueID(C->getOperand(1)));
           uint64_t Flags = getOptimizationFlags(CE);
           if (Flags != 0)
             Record.push_back(Flags);
         }
         break;
+      case Instruction::FNeg: {
+        assert(CE->getNumOperands() == 1 && "Unknown constant expr!");
+        Code = bitc::CST_CODE_CE_UNOP;
+        Record.push_back(getEncodedUnaryOpcode(CE->getOpcode()));
+        Record.push_back(VE.getValueID(C->getOperand(0)));
+        uint64_t Flags = getOptimizationFlags(CE);
+        if (Flags != 0)
+          Record.push_back(Flags);
+        break;
+      }
       case Instruction::GetElementPtr: {
         Code = bitc::CST_CODE_CE_GEP;
         const auto *GO = cast<GEPOperator>(C);
         Record.push_back(VE.getTypeID(GO->getSourceElementType()));
         if (Optional<unsigned> Idx = GO->getInRangeIndex()) {
           Code = bitc::CST_CODE_CE_GEP_WITH_INRANGE_INDEX;
           Record.push_back((*Idx << 1) | GO->isInBounds());
         } else if (GO->isInBounds())
if (Instruction::isCast(I.getOpcode())) {
       uint64_t Flags = getOptimizationFlags(&I);
       if (Flags != 0) {
         if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV)
           AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV;
         Vals.push_back(Flags);
       }
     }
     break;
-
+  case Instruction::FNeg: {
+    Code = bitc::FUNC_CODE_INST_UNOP;
+    if (!pushValueAndType(I.getOperand(0), InstID, Vals))
+      AbbrevToUse = FUNCTION_INST_UNOP_ABBREV;
+    Vals.push_back(getEncodedUnaryOpcode(I.getOpcode()));
+    uint64_t Flags = getOptimizationFlags(&I);
+    if (Flags != 0) {
+      if (AbbrevToUse == FUNCTION_INST_UNOP_ABBREV)
+        AbbrevToUse = FUNCTION_INST_UNOP_FLAGS_ABBREV;
+      Vals.push_back(Flags);
+    }
+    break;
+  }
   case Instruction::GetElementPtr: {
     Code = bitc::FUNC_CODE_INST_GEP;
     AbbrevToUse = FUNCTION_INST_GEP_ABBREV;
     auto &GEPInst = cast<GetElementPtrInst>(I);
     Vals.push_back(GEPInst.isInBounds());
     Vals.push_back(VE.getTypeID(GEPInst.getSourceElementType()));
     for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
       pushValueAndType(I.getOperand(i), InstID, Vals);
// FIXME: This should only use space for first class types!
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,    // dest ty
                               VE.computeBitsRequiredForTypeIndicies()));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
     if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
         FUNCTION_INST_LOAD_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
+  { // INST_UNOP abbrev for FUNCTION_BLOCK.
+    auto Abbv = std::make_shared<BitCodeAbbrev>();
+    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNOP));
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
+        FUNCTION_INST_UNOP_ABBREV)
+      llvm_unreachable("Unexpected abbrev ordering!");
+  }
+  { // INST_UNOP_FLAGS abbrev for FUNCTION_BLOCK.
+    auto Abbv = std::make_shared<BitCodeAbbrev>();
+    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNOP));
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); // flags
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
+        FUNCTION_INST_UNOP_FLAGS_ABBREV)
+      llvm_unreachable("Unexpected abbrev ordering!");
+  }
   { // INST_BINOP abbrev for FUNCTION_BLOCK.
     auto Abbv = std::make_shared<BitCodeAbbrev>();
     Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
     if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
         FUNCTION_INST_BINOP_ABBREV)

lib/CodeGen/GlobalISel/IRTranslator.cpp

if (isa<Constant>(U.getOperand(0)) &&
     MIRBuilder.buildInstr(TargetOpcode::G_FNEG)
         .addDef(getOrCreateVReg(U))
         .addUse(getOrCreateVReg(*U.getOperand(1)));
     return true;
   }
   return translateBinaryOp(TargetOpcode::G_FSUB, U, MIRBuilder);
 }
 
+bool IRTranslator::translateFNeg(const User &U, MachineIRBuilder &MIRBuilder) {
+  MIRBuilder.buildInstr(TargetOpcode::G_FNEG)
+      .addDef(getOrCreateVReg(U))
+      .addUse(getOrCreateVReg(*U.getOperand(1)));
+  return true;
+}
+
 bool IRTranslator::translateCompare(const User &U,
                                     MachineIRBuilder &MIRBuilder) {
   const CmpInst *CI = dyn_cast<CmpInst>(&U);
   unsigned Op0 = getOrCreateVReg(*U.getOperand(0));
   unsigned Op1 = getOrCreateVReg(*U.getOperand(1));
   unsigned Res = getOrCreateVReg(U);
   CmpInst::Predicate Pred =
       CI ? CI->getPredicate() : static_cast<CmpInst::Predicate>(

lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h

public:
   void visitJumpTableHeader(JumpTable &JT, JumpTableHeader &JTH,
                             MachineBasicBlock *SwitchBB);
 
 private:
   // These all get lowered before this pass.
   void visitInvoke(const InvokeInst &I);
   void visitResume(const ResumeInst &I);
 
+  void visitUnary(const User &I, unsigned Opcode);
+  void visitFNeg(const User &I) { visitUnary(I, ISD::FNEG); }
+
   void visitBinary(const User &I, unsigned Opcode);
   void visitShift(const User &I, unsigned Opcode);
   void visitAdd(const User &I)  { visitBinary(I, ISD::ADD); }
   void visitFAdd(const User &I) { visitBinary(I, ISD::FADD); }
   void visitSub(const User &I)  { visitBinary(I, ISD::SUB); }
   void visitFSub(const User &I);
   void visitMul(const User &I)  { visitBinary(I, ISD::MUL); }
   void visitFMul(const User &I) { visitBinary(I, ISD::FMUL); }

lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

for (const auto &U : User->users()) {
         ReduxExtracted = true;
       } else
         return false;
     }
   }
   return ReduxExtracted;
 }
 
+void SelectionDAGBuilder::visitUnary(const User &I, unsigned Opcode) {
+  SDNodeFlags Flags;
+
+  SDValue Op = getValue(I.getOperand(0));
+  SDValue UnNodeValue = DAG.getNode(Opcode, getCurSDLoc(), Op.getValueType(),
+                                    Op, Flags);
+  setValue(&I, UnNodeValue);
+}
+
 void SelectionDAGBuilder::visitBinary(const User &I, unsigned Opcode) {
   SDNodeFlags Flags;
   if (auto *OFBinOp = dyn_cast<OverflowingBinaryOperator>(&I)) {
     Flags.setNoSignedWrap(OFBinOp->hasNoSignedWrap());
     Flags.setNoUnsignedWrap(OFBinOp->hasNoUnsignedWrap());
   }
   if (auto *ExactOp = dyn_cast<PossiblyExactOperator>(&I)) {
     Flags.setExact(ExactOp->isExact());

lib/CodeGen/TargetLoweringBase.cpp

#include "llvm/IR/Instruction.def"
   case Invoke:         return 0;
   case Resume:         return 0;
   case Unreachable:    return 0;
   case CleanupRet:     return 0;
   case CatchRet:       return 0;
   case CatchPad:       return 0;
   case CatchSwitch:    return 0;
   case CleanupPad:     return 0;
+  case FNeg:           return ISD::FNEG;
   case Add:            return ISD::ADD;
   case FAdd:           return ISD::FADD;
   case Sub:            return ISD::SUB;
   case FSub:           return ISD::FSUB;
   case Mul:            return ISD::MUL;
   case FMul:           return ISD::FMUL;
   case UDiv:           return ISD::UDIV;
   case SDiv:           return ISD::SDIV;

lib/IR/Constants.cpp

if (VectorType *VT = dyn_cast<VectorType>(DstTy)) {
       // Handle vectors of pointers.
       MidTy = VectorType::get(MidTy, VT->getNumElements());
     }
     C = getBitCast(C, MidTy);
   }
   return getFoldedCast(Instruction::AddrSpaceCast, C, DstTy, OnlyIfReduced);
 }
 
+Constant *ConstantExpr::get(unsigned Opcode, Constant *C, unsigned Flags, 
+                            Type *OnlyIfReducedTy) {
+  // Check the operands for consistency first.
+  assert(Instruction::isUnaryOp(Opcode) &&
+         "Invalid opcode in unary constant expression");
+
+#ifndef NDEBUG
+  switch (Opcode) {
+  case Instruction::FNeg:
+    assert(C->getType()->isFPOrFPVectorTy() &&
+           "Tried to create a floating-point operation on a "
+           "non-floating-point type!");
+    break;
+  default:
+    break;
+  }
+#endif
+
+  // TODO: Try to constant fold operation.
+
+  if (OnlyIfReducedTy == C->getType())
+    return nullptr;
+
+  Constant *ArgVec[] = { C };
+  ConstantExprKeyType Key(Opcode, ArgVec, 0, Flags);
+
+  LLVMContextImpl *pImpl = C->getContext().pImpl;
+  return pImpl->ExprConstants.getOrCreate(C->getType(), Key);
+}
+
 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
                             unsigned Flags, Type *OnlyIfReducedTy) {
   // Check the operands for consistency first.
   assert(Instruction::isBinaryOp(Opcode) &&
          "Invalid opcode in binary constant expression");
   assert(C1->getType() == C2->getType() &&
          "Operand types in binary constant expression should match");
 

lib/IR/ConstantsContext.h

return hash_combine(Opcode, SubclassOptionalData, SubclassData,
                         hash_combine_range(Indexes.begin(), Indexes.end()));
   }
 
   using TypeClass = ConstantInfo<ConstantExpr>::TypeClass;
 
   ConstantExpr *create(TypeClass *Ty) const {
     switch (Opcode) {
     default:
-      if (Instruction::isCast(Opcode))
+      if (Instruction::isCast(Opcode) ||
+          (Opcode >= Instruction::UnaryOpsBegin &&
+           Opcode < Instruction::UnaryOpsEnd))
         return new UnaryConstantExpr(Opcode, Ops[0], Ty);
       if ((Opcode >= Instruction::BinaryOpsBegin &&
            Opcode < Instruction::BinaryOpsEnd))
         return new BinaryConstantExpr(Opcode, Ops[0], Ops[1],
                                       SubclassOptionalData);
       llvm_unreachable("Invalid ConstantExpr!");
     case Instruction::Select:
       return new SelectConstantExpr(Ops[0], Ops[1], Ops[2]);

lib/IR/Instruction.cpp

const char *Instruction::getOpcodeName(unsigned OpCode) {
   case Invoke: return "invoke";
   case Resume: return "resume";
   case Unreachable: return "unreachable";
   case CleanupRet: return "cleanupret";
   case CatchRet: return "catchret";
   case CatchPad: return "catchpad";
   case CatchSwitch: return "catchswitch";
 
+  // Standard unary operators...
+  case FNeg: return "fneg";
+
   // Standard binary operators...
   case Add: return "add";
   case FAdd: return "fadd";
   case Sub: return "sub";
   case FSub: return "fsub";
   case Mul: return "mul";
   case FMul: return "fmul";
   case UDiv: return "udiv";

lib/IR/Instructions.cpp

for (unsigned Index : Idxs) {
     }
 
     Agg = cast<CompositeType>(Agg)->getTypeAtIndex(Index);
   }
   return const_cast<Type*>(Agg);
 }
 
 //===----------------------------------------------------------------------===//
+//                             UnaryOperator Class
+//===----------------------------------------------------------------------===//
+
+UnaryOperator::UnaryOperator(UnaryOps iType, Value *S,
+                             Type *Ty, const Twine &Name,
+                             Instruction *InsertBefore)
+  : UnaryInstruction(Ty, iType, S, InsertBefore) {
+  Op<0>() = S;
+  setName(Name);
+  AssertOK();
+}
+
+UnaryOperator::UnaryOperator(UnaryOps iType, Value *S,
+                             Type *Ty, const Twine &Name,
+                             BasicBlock *InsertAtEnd)
+  : UnaryInstruction(Ty, iType, S, InsertAtEnd) {
+  Op<0>() = S;
+  setName(Name);
+  AssertOK();
+}
+
+UnaryOperator *UnaryOperator::Create(UnaryOps Op, Value *S,
+                                     const Twine &Name,
+                                     Instruction *InsertBefore) {
+  return new UnaryOperator(Op, S, S->getType(), Name, InsertBefore);
+}
+
+UnaryOperator *UnaryOperator::Create(UnaryOps Op, Value *S,
+                                     const Twine &Name,
+                                     BasicBlock *InsertAtEnd) {
+  UnaryOperator *Res = Create(Op, S, Name);
+  InsertAtEnd->getInstList().push_back(Res);
+  return Res;
+}
+
+void UnaryOperator::AssertOK() {
+  Value *LHS = getOperand(0);
+  (void)LHS; // Silence warnings.
+#ifndef NDEBUG
+  switch (getOpcode()) {
+  case FNeg:
+    assert(getType() == LHS->getType() &&
+           "Unary operation should return same type as operand!");
+    assert(getType()->isFPOrFPVectorTy() &&
+           "Tried to create a floating-point operation on a "
+           "non-floating-point type!");
+    break;
+  default: llvm_unreachable("Invalid opcode provided");
+  }
+#endif
+}
+
+//===----------------------------------------------------------------------===//
 //                             BinaryOperator Class
 //===----------------------------------------------------------------------===//
 
 BinaryOperator::BinaryOperator(BinaryOps iType, Value *S1, Value *S2,
                                Type *Ty, const Twine &Name,
                                Instruction *InsertBefore)
   : Instruction(Ty, iType,
                 OperandTraits<BinaryOperator>::op_begin(this),

 
 // Define these methods here so vtables don't get emitted into every translation
 // unit that uses these classes.
 
 GetElementPtrInst *GetElementPtrInst::cloneImpl() const {
   return new (getNumOperands()) GetElementPtrInst(*this);
 }
 
+UnaryOperator *UnaryOperator::cloneImpl() const {
+  return Create(getOpcode(), Op<0>());
+}
+
 BinaryOperator *BinaryOperator::cloneImpl() const {
   return Create(getOpcode(), Op<0>(), Op<1>());
 }
 
 FCmpInst *FCmpInst::cloneImpl() const {
   return new FCmpInst(getPredicate(), Op<0>(), Op<1>());
 }
 

lib/IR/Verifier.cpp

#include "llvm/IR/Metadata.def"
   void visitFPToSIInst(FPToSIInst &I);
   void visitUIToFPInst(UIToFPInst &I);
   void visitSIToFPInst(SIToFPInst &I);
   void visitIntToPtrInst(IntToPtrInst &I);
   void visitPtrToIntInst(PtrToIntInst &I);
   void visitBitCastInst(BitCastInst &I);
   void visitAddrSpaceCastInst(AddrSpaceCastInst &I);
   void visitPHINode(PHINode &PN);
+  void visitUnaryOperator(UnaryOperator &U);
   void visitBinaryOperator(BinaryOperator &B);
   void visitICmpInst(ICmpInst &IC);
   void visitFCmpInst(FCmpInst &FC);
   void visitExtractElementInst(ExtractElementInst &EI);
   void visitInsertElementInst(InsertElementInst &EI);
   void visitShuffleVectorInst(ShuffleVectorInst &EI);
   void visitVAArgInst(VAArgInst &VAA) { visitInstruction(VAA); }
   void visitCallInst(CallInst &CI);
void Verifier::visitInvokeInst(InvokeInst &II) {
   Assert(
       II.getUnwindDest()->isEHPad(),
       "The unwind destination does not have an exception handling instruction!",
       &II);
 
   visitTerminator(II);
 }
 
+/// visitUnaryOperator - Check the argument to the unary operator.
+///
+void Verifier::visitUnaryOperator(UnaryOperator &U) {
+  Assert(U.getType() == U.getOperand(0)->getType(), 
+         "Unary operators must have same type for"
+         "operands and result!",
+         &U);
+
+  switch (U.getOpcode()) {
+  // Check that floating-point arithmetic operators are only used with
+  // floating-point operands.
+  case Instruction::FNeg:
+    Assert(U.getType()->isFPOrFPVectorTy(),
+           "FNeg operator only works with float types!", &U);
+    break;
+  default:
+    llvm_unreachable("Unknown UnaryOperator opcode!");
+  }
+
+  visitInstruction(U);
+}
+
 /// visitBinaryOperator - Check that both arguments to the binary operator are
 /// of the same type!
 ///
 void Verifier::visitBinaryOperator(BinaryOperator &B) {
   Assert(B.getOperand(0)->getType() == B.getOperand(1)->getType(),
          "Both operands to a binary operator are not of the same type!", &B);
 
   switch (B.getOpcode()) {

test/Assembler/fast-math-flags.ll

 ; CHECK:  %d = fdiv float %x, %y
   %d = fdiv float %x, %y
 ; CHECK:  %d_vec = fdiv <3 x float> %vec, %vec
   %d_vec = fdiv <3 x float> %vec, %vec
 ; CHECK:  %e = frem float %x, %y
   %e = frem float %x, %y
 ; CHECK:  %e_vec = frem <3 x float> %vec, %vec
   %e_vec = frem <3 x float> %vec, %vec
-; CHECK:  ret float %e
-  ret float %e
+; CHECK:  %f = fneg float %x
+  %f = fneg float %x
+; CHECK:  %f_vec = fneg <3 x float> %vec
+  %f_vec = fneg <3 x float> %vec
+; CHECK:  ret float %f
+  ret  float %f
 }
 
 ; CHECK: no_nan
 define float @no_nan(float %x, float %y) {
 entry:
 ; CHECK:  %vec = load <3 x float>, <3 x float>* @vec
   %vec    = load <3 x float>, <3 x float>* @vec
 ; CHECK:  %select = load i1, i1* @select

 ; CHECK:  %d = fdiv nnan float %x, %y
   %d = fdiv nnan float %x, %y
 ; CHECK:  %d_vec = fdiv nnan <3 x float> %vec, %vec
   %d_vec = fdiv nnan <3 x float> %vec, %vec
 ; CHECK:  %e = frem nnan float %x, %y
   %e = frem nnan float %x, %y
 ; CHECK:  %e_vec = frem nnan <3 x float> %vec, %vec
   %e_vec = frem nnan <3 x float> %vec, %vec
-; CHECK:  ret float %e
-  ret float %e
+; CHECK:  %f = fneg nnan float %x
+  %f = fneg nnan float %x
+; CHECK:  %f_vec = fneg nnan <3 x float> %vec
+  %f_vec = fneg nnan <3 x float> %vec
+; CHECK:  ret float %f
+  ret float %f
 }
 
 ; CHECK: @contract(
 define float @contract(float %x, float %y) {
 entry:
 ; CHECK: %a = fsub contract float %x, %y
   %a = fsub contract float %x, %y
 ; CHECK: %b = fadd contract float %x, %y

 ; CHECK:  %d = fdiv nnan ninf arcp float %x, %y
   %d = fdiv arcp ninf nnan float %x, %y
 ; CHECK:  %d_vec = fdiv fast <3 x float> %vec, %vec
   %d_vec = fdiv fast nnan arcp <3 x float> %vec, %vec
 ; CHECK:  %e = frem nnan nsz float %x, %y
   %e = frem nnan nsz float %x, %y
 ; CHECK:  %e_vec = frem nnan <3 x float> %vec, %vec
   %e_vec = frem nnan <3 x float> %vec, %vec
-; CHECK:  ret float %e
-  ret float %e
+; CHECK:  %f = fneg nnan nsz float %x
+  %f = fneg nnan nsz float %x
+; CHECK:  %f_vec = fneg fast <3 x float> %vec
+  %f_vec = fneg fast <3 x float> %vec
+; CHECK:  ret float %f
+  ret float %f
 }

test/CodeGen/Generic/fneg-fabs.ll

 ; RUN: llc < %s
 
 define double @fneg(double %X) {
         %Y = fsub double -0.000000e+00, %X               ; <double> [#uses=1]
         ret double %Y
 }
 
 define float @fnegf(float %X) {
         %Y = fsub float -0.000000e+00, %X                ; <float> [#uses=1]
         ret float %Y
 }
 
+define double @real_fneg(double %X) {
+        %Y = fneg double %X               ; <double> [#uses=1]
+        ret double %Y
+}
+
+define double @real_fneg_constant() {
+        %Y = fneg double -2.0             ; <double> [#uses=1]
+        ret double %Y
+}
+
+define float @real_fnegf(float %X) {
+        %Y = fneg float %X                ; <float> [#uses=1]
+        ret float %Y
+}
+
 declare double @fabs(double)
 
 declare float @fabsf(float)
 
 define double @fabstest(double %X) {
         %Y = call double @fabs( double %X )             ; <double> [#uses=1]
         ret double %Y
 }
 
 define float @fabsftest(float %X) {
         %Y = call float @fabsf( float %X )              ; <float> [#uses=1]
         ret float %Y
 }
 

test/CodeGen/X86/vec_fneg.ll

 ;
 ; X64-SSE-LABEL: fsub0_undef_elts_v4f32:
 ; X64-SSE:       # %bb.0:
 ; X64-SSE-NEXT:    retq
   %r = fsub <4 x float> %x, <float 0.0, float undef, float 0.0, float undef>
   ret <4 x float> %r
 }
 
+define <4 x float> @fneg(<4 x float> %Q) nounwind {
+; X32-SSE-LABEL: fneg:
+; X32-SSE:       # %bb.0:
+; X32-SSE-NEXT:    xorps {{\.LCPI.*}}, %xmm0
+; X32-SSE-NEXT:    retl
+;
+; X64-SSE-LABEL: fneg:
+; X64-SSE:       # %bb.0:
+; X64-SSE-NEXT:    xorps {{.*}}(%rip), %xmm0
+; X64-SSE-NEXT:    retq
+  %tmp = fneg <4 x float> %Q
+  ret <4 x float> %tmp
+}
+
+

tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp

default: return nullptr;
       STRINGIFY_CODE(CST_CODE, CE_INBOUNDS_GEP)
       STRINGIFY_CODE(CST_CODE, CE_SELECT)
       STRINGIFY_CODE(CST_CODE, CE_EXTRACTELT)
       STRINGIFY_CODE(CST_CODE, CE_INSERTELT)
       STRINGIFY_CODE(CST_CODE, CE_SHUFFLEVEC)
       STRINGIFY_CODE(CST_CODE, CE_CMP)
       STRINGIFY_CODE(CST_CODE, INLINEASM)
       STRINGIFY_CODE(CST_CODE, CE_SHUFVEC_EX)
+      STRINGIFY_CODE(CST_CODE, CE_UNOP)
     case bitc::CST_CODE_BLOCKADDRESS:    return "CST_CODE_BLOCKADDRESS";
       STRINGIFY_CODE(CST_CODE, DATA)
     }
   case bitc::FUNCTION_BLOCK_ID:
     switch (CodeID) {
     default: return nullptr;
       STRINGIFY_CODE(FUNC_CODE, DECLAREBLOCKS)
       STRINGIFY_CODE(FUNC_CODE, INST_BINOP)