[PowerPC] Add options to control paired vector memops support

[bsaleil]

Summary

This patch adds frontend and backend options to enable and disable the PowerPC paired vector memory operations added in ISA 3.1.
Instructions using these options will be added in subsequent patches.

[nemanjai]

Please re-upload this and provide the missing context.

[bsaleil]

Re-upload with surrounding context

[bsaleil]

Add test to check paired-vector-memops is supported by the targets.

[amyk]

llvm/lib/Target/PowerPC/PPC.td

243

Is this supposed to be FeatureISA3_1?

llvm/lib/Target/PowerPC/PPCScheduleP9.td

44

Add the paired vector mem ops to the comment.

[bsaleil]

Add PairedVectorMemops to the list of unsupported features in a comment

[bsaleil]

llvm/lib/Target/PowerPC/PPC.td

243

We need to keep FeatureISA3_0 to be able to enable MMA (that depends on this feature) with P9 codegen.

[amyk]

This LGTM. Thanks for addressing the comments Baptiste.

[bsaleil]

Update diff so it can be applied to master

clang/include/clang/Driver/Options.td

 def mpower8_crypto : Flag<["-"], "mcrypto">,
     Group<m_ppc_Features_Group>;
 def mnopower8_crypto : Flag<["-"], "mno-crypto">,
     Group<m_ppc_Features_Group>;
 def mdirect_move : Flag<["-"], "mdirect-move">,
     Group<m_ppc_Features_Group>;
 def mnodirect_move : Flag<["-"], "mno-direct-move">,
     Group<m_ppc_Features_Group>;
+def mpaired_vector_memops: Flag<["-"], "mpaired-vector-memops">,
+    Group<m_ppc_Features_Group>;
+def mnopaired_vector_memops: Flag<["-"], "mno-paired-vector-memops">,
+    Group<m_ppc_Features_Group>;
 def mhtm : Flag<["-"], "mhtm">, Group<m_ppc_Features_Group>;
 def mno_htm : Flag<["-"], "mno-htm">, Group<m_ppc_Features_Group>;
 def mfprnd : Flag<["-"], "mfprnd">, Group<m_ppc_Features_Group>;
 def mno_fprnd : Flag<["-"], "mno-fprnd">, Group<m_ppc_Features_Group>;
 def mcmpb : Flag<["-"], "mcmpb">, Group<m_ppc_Features_Group>;
 def mno_cmpb : Flag<["-"], "mno-cmpb">, Group<m_ppc_Features_Group>;
 def misel : Flag<["-"], "misel">, Group<m_ppc_Features_Group>;
 def mno_isel : Flag<["-"], "mno-isel">, Group<m_ppc_Features_Group>;

clang/lib/Basic/Targets/PPC.h

class LLVM_LIBRARY_VISIBILITY PPCTargetInfo : public TargetInfo {
   bool HasP8Crypto = false;
   bool HasDirectMove = false;
   bool HasQPX = false;
   bool HasHTM = false;
   bool HasBPERMD = false;
   bool HasExtDiv = false;
   bool HasP9Vector = false;
   bool HasSPE = false;
+  bool PairedVectorMemops = false;
   bool HasP10Vector = false;
   bool HasPCRelativeMemops = false;
 
 protected:
   std::string ABI;
 
 public:
   PPCTargetInfo(const llvm::Triple &Triple, const TargetOptions &)

clang/lib/Basic/Targets/PPC.cpp

for (const auto &Feature : Features) {
     } else if (Feature == "+pcrelative-memops") {
       HasPCRelativeMemops = true;
     } else if (Feature == "+spe") {
       HasSPE = true;
       LongDoubleWidth = LongDoubleAlign = 64;
       LongDoubleFormat = &llvm::APFloat::IEEEdouble();
     } else if (Feature == "-hard-float") {
       FloatABI = SoftFloat;
+    } else if (Feature == "+paired-vector-memops") {
+      PairedVectorMemops = true;
     }
     // TODO: Finish this list and add an assert that we've handled them
     // all.
   }
 
   return true;
 }
 

 }
 
 // Handle explicit options being passed to the compiler here: if we've
 // explicitly turned off vsx and turned on any of:
 // - power8-vector
 // - direct-move
 // - float128
 // - power9-vector
+// - paired-vector-memops
 // - power10-vector
 // then go ahead and error since the customer has expressed an incompatible
 // set of options.
 static bool ppcUserFeaturesCheck(DiagnosticsEngine &Diags,
                                  const std::vector<std::string> &FeaturesVec) {
 
   // vsx was not explicitly turned off.
   if (llvm::find(FeaturesVec, "-vsx") == FeaturesVec.end())
     return true;
 
   auto FindVSXSubfeature = [&](StringRef Feature, StringRef Option) {
     if (llvm::find(FeaturesVec, Feature) != FeaturesVec.end()) {
       Diags.Report(diag::err_opt_not_valid_with_opt) << Option << "-mno-vsx";
       return true;
     }
     return false;
   };
 
   bool Found = FindVSXSubfeature("+power8-vector", "-mpower8-vector");
   Found |= FindVSXSubfeature("+direct-move", "-mdirect-move");
   Found |= FindVSXSubfeature("+float128", "-mfloat128");
   Found |= FindVSXSubfeature("+power9-vector", "-mpower9-vector");
+  Found |= FindVSXSubfeature("+paired-vector-memops", "-mpaired-vector-memops");
   Found |= FindVSXSubfeature("+power10-vector", "-mpower10-vector");
 
   // Return false if any vsx subfeatures was found.
   return !Found;
 }
 
 bool PPCTargetInfo::initFeatureMap(
     llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef CPU,
bool PPCTargetInfo::initFeatureMap(
 
   return TargetInfo::initFeatureMap(Features, Diags, CPU, FeaturesVec);
 }
 
 // Add any Power10 specific features.
 void PPCTargetInfo::addP10SpecificFeatures(
     llvm::StringMap<bool> &Features) const {
   Features["htm"] = false; // HTM was removed for P10.
+  Features["paired-vector-memops"] = true;
   Features["power10-vector"] = true;
   Features["pcrelative-memops"] = true;
   return;
 }
 
 // Add features specific to the "Future" CPU.
 void PPCTargetInfo::addFutureSpecificFeatures(
     llvm::StringMap<bool> &Features) const {
return llvm::StringSwitch<bool>(Feature)
       .Case("crypto", HasP8Crypto)
       .Case("direct-move", HasDirectMove)
       .Case("qpx", HasQPX)
       .Case("htm", HasHTM)
       .Case("bpermd", HasBPERMD)
       .Case("extdiv", HasExtDiv)
       .Case("float128", HasFloat128)
       .Case("power9-vector", HasP9Vector)
+      .Case("paired-vector-memops", PairedVectorMemops)
       .Case("power10-vector", HasP10Vector)
       .Case("pcrelative-memops", HasPCRelativeMemops)
       .Case("spe", HasSPE)
       .Default(false);
 }
 
 void PPCTargetInfo::setFeatureEnabled(llvm::StringMap<bool> &Features,
                                       StringRef Name, bool Enabled) const {
   if (Enabled) {
     // If we're enabling any of the vsx based features then enable vsx and
     // altivec. We'll diagnose any problems later.
     bool FeatureHasVSX = llvm::StringSwitch<bool>(Name)
                              .Case("vsx", true)
                              .Case("direct-move", true)
                              .Case("power8-vector", true)
                              .Case("power9-vector", true)
+                             .Case("paired-vector-memops", true)
                              .Case("power10-vector", true)
                              .Case("float128", true)
                              .Default(false);
     if (FeatureHasVSX)
       Features["vsx"] = Features["altivec"] = true;
     if (Name == "power9-vector")
       Features["power8-vector"] = true;
     else if (Name == "power10-vector")
       Features["power8-vector"] = Features["power9-vector"] = true;
     if (Name == "pcrel")
       Features["pcrelative-memops"] = true;
     else
       Features[Name] = true;
   } else {
     // If we're disabling altivec or vsx go ahead and disable all of the vsx
     // features.
     if ((Name == "altivec") || (Name == "vsx"))
       Features["vsx"] = Features["direct-move"] = Features["power8-vector"] =
           Features["float128"] = Features["power9-vector"] =
-              Features["power10-vector"] = false;
+              Features["paired-vector-memops"] = Features["power10-vector"] =
+                  false;
     if (Name == "power8-vector")
-      Features["power9-vector"] = Features["power10-vector"] = false;
-    else if (Name == "power9-vector")
+      Features["power9-vector"] = Features["paired-vector-memops"] =
           Features["power10-vector"] = false;
+    else if (Name == "power9-vector")
+      Features["paired-vector-memops"] = Features["power10-vector"] = false;
     if (Name == "pcrel")
       Features["pcrelative-memops"] = false;
     else
       Features[Name] = false;
   }
 }
 
 const char *const PPCTargetInfo::GCCRegNames[] = {

clang/test/Driver/ppc-dependent-options.cpp

 // RUN: -mcpu=power9 -std=c++11 -mno-vsx -mpower9-vector %s 2>&1 | \
 // RUN: FileCheck %s -check-prefix=CHECK-NVSX-P9V
 
 // RUN: not %clang -target powerpc64le-unknown-unknown -fsyntax-only \
 // RUN: -mcpu=power9 -std=c++11 -mno-vsx -mfloat128 %s 2>&1 | \
 // RUN: FileCheck %s -check-prefix=CHECK-NVSX-FLT128
 
 // RUN: not %clang -target powerpc64le-unknown-unknown -fsyntax-only \
+// RUN: -mcpu=power10 -std=c++11 -mno-vsx -mpaired-vector-memops %s 2>&1 | \
+// RUN: FileCheck %s -check-prefix=CHECK-NVSX-PAIRED-VEC-MEMOPS
+
+// RUN: not %clang -target powerpc64le-unknown-unknown -fsyntax-only \
 // RUN: -mcpu=power9 -std=c++11 -mno-vsx -mfloat128 -mpower9-vector %s 2>&1 | \
 // RUN: FileCheck %s -check-prefix=CHECK-NVSX-MULTI
 
 // RUN: not %clang -target powerpc64le-unknown-unknown -fsyntax-only \
 // RUN: -mcpu=power10 -std=c++11 %s 2>&1 | FileCheck %s \
 // RUN: -check-prefix=CHECK-DEFAULT-P10
 
 // RUN: not %clang -target powerpc64le-unknown-unknown -fsyntax-only \

 // CHECK-DEFAULT: P8V enabled
 // CHECK-DEFAULT-P9: P9V enabled
 // CHECK-DEFAULT-P10: P10V enabled
 // CHECK-NVSX-P8V: error: option '-mpower8-vector' cannot be specified with '-mno-vsx'
 // CHECK-NVSX-P9V: error: option '-mpower9-vector' cannot be specified with '-mno-vsx'
 // CHECK-NVSX-P10V: error: option '-mpower10-vector' cannot be specified with '-mno-vsx'
 // CHECK-NVSX-FLT128: error: option '-mfloat128' cannot be specified with '-mno-vsx'
 // CHECK-NVSX-DMV: error: option '-mdirect-move' cannot be specified with '-mno-vsx'
+// CHECK-NVSX-PAIRED-VEC-MEMOPS: error: option '-mpaired-vector-memops' cannot be specified with '-mno-vsx'
 // CHECK-NVSX-MULTI: error: option '-mfloat128' cannot be specified with '-mno-vsx'
 // CHECK-NVSX-MULTI: error: option '-mpower9-vector' cannot be specified with '-mno-vsx'
 // CHECK-NVSX: Neither enabled
 // CHECK-VSX: VSX enabled

llvm/lib/Target/PowerPC/PPC.td

def FeaturePrefixInstrs : SubtargetFeature<"prefix-instrs", "HasPrefixInstrs",
                                            "true",
                                            "Enable prefixed instructions",
                                            [FeatureISA3_0, FeatureP8Vector,
                                             FeatureP9Altivec]>;
 def FeaturePCRelativeMemops :
   SubtargetFeature<"pcrelative-memops", "HasPCRelativeMemops", "true",
                    "Enable PC relative Memory Ops",
                    [FeatureISA3_0]>;
+def FeaturePairedVectorMemops:
+  SubtargetFeature<"paired-vector-memops", "PairedVectorMemops", "true",
+                   "32Byte load and store instructions",
+                   [FeatureISA3_0]>;
 
 def FeaturePredictableSelectIsExpensive :
   SubtargetFeature<"predictable-select-expensive",
                    "PredictableSelectIsExpensive",
                    "true",
                    "Prefer likely predicted branches over selects">;
 
 // Since new processors generally contain a superset of features of those that
def ProcessorFeatures {
   list<SubtargetFeature> P9Features =
     !listconcat(P9InheritableFeatures, P9SpecificFeatures);
 
   // Power10
   // For P10 CPU we assume that all of the existing features from Power9
   // still exist with the exception of those we know are Power9 specific.
   list<SubtargetFeature> P10AdditionalFeatures =
     [DirectivePwr10, FeatureISA3_1, FeaturePrefixInstrs,
-     FeaturePCRelativeMemops, FeatureP10Vector];
+     FeaturePCRelativeMemops, FeatureP10Vector, FeaturePairedVectorMemops];
   list<SubtargetFeature> P10SpecificFeatures = [];
   list<SubtargetFeature> P10InheritableFeatures =
     !listconcat(P9InheritableFeatures, P10AdditionalFeatures);
   list<SubtargetFeature> P10Features =
     !listconcat(P10InheritableFeatures, P10SpecificFeatures);
 
   // Future
   // For future CPU we assume that all of the existing features from Power10

llvm/lib/Target/PowerPC/PPCInstrPrefix.td

def NAME : 8LS_DForm_R_SI34_XT6_RA5<opcode, OOL, IOL,
                                       !strconcat(asmstr, ", 0"), itin, []>;
   def pc : 8LS_DForm_R_SI34_XT6_RA5<opcode, OOL, PCRel_IOL,
                                     !strconcat(asmstr, ", 1"), itin, []>,
                                     isPCRel;
 }
 
 def PrefixInstrs : Predicate<"Subtarget->hasPrefixInstrs()">;
 def IsISA3_1 : Predicate<"Subtarget->isISA3_1()">;
+def PairedVectorMemops : Predicate<"PPCSubTarget->pairedVectorMemops()">;
 
 let Predicates = [PrefixInstrs] in {
   let Interpretation64Bit = 1, isCodeGenOnly = 1 in {
     defm PADDI8 :
       MLS_DForm_R_SI34_RTA5_p<14, (outs g8rc:$RT), (ins g8rc:$RA, s34imm:$SI),
                               (ins immZero:$RA, s34imm:$SI),
                               "paddi $RT, $RA, $SI", IIC_LdStLFD>;
     let isReMaterializable = 1, isAsCheapAsAMove = 1, isMoveImm = 1 in {

llvm/lib/Target/PowerPC/PPCScheduleP9.td

def P9Model : SchedMachineModel {
   // issue queue until all register sources and other dependencies have been
   // resolved and they can be issued. Each of four execution slices has an
   // 11-entry iop issue queue.
   let MicroOpBufferSize = 44;
 
   let CompleteModel = 1;
 
   // Do not support QPX (Quad Processing eXtension), SPE (Signal Processing
   // Engine), prefixed instructions on Power 9, PC relative mem ops, or
   // instructions introduced in ISA 3.1.
-  let UnsupportedFeatures = [HasQPX, HasSPE, PrefixInstrs, PCRelativeMemops,
-                             IsISA3_1];
+  let UnsupportedFeatures = [HasQPX, HasSPE, PrefixInstrs, PairedVectorMemops,
+                             PCRelativeMemops, IsISA3_1];
 
 }
 
 let SchedModel = P9Model in {
 
   // ***************** Processor Resources *****************
 
   // Dispatcher slots:

llvm/lib/Target/PowerPC/PPCSubtarget.h

protected:
   bool HasAddisLoadFusion;
   bool IsISA3_0;
   bool IsISA3_1;
   bool UseLongCalls;
   bool SecurePlt;
   bool VectorsUseTwoUnits;
   bool UsePPCPreRASchedStrategy;
   bool UsePPCPostRASchedStrategy;
+  bool PairedVectorMemops;
   bool PredictableSelectIsExpensive;
 
   POPCNTDKind HasPOPCNTD;
 
   /// When targeting QPX running a stock PPC64 Linux kernel where the stack
   /// alignment has not been changed, we need to keep the 16-byte alignment
   /// of the stack.
   bool IsQPXStackUnaligned;
public:
   bool hasP8Vector() const { return HasP8Vector; }
   bool hasP8Altivec() const { return HasP8Altivec; }
   bool hasP8Crypto() const { return HasP8Crypto; }
   bool hasP9Vector() const { return HasP9Vector; }
   bool hasP9Altivec() const { return HasP9Altivec; }
   bool hasP10Vector() const { return HasP10Vector; }
   bool hasPrefixInstrs() const { return HasPrefixInstrs; }
   bool hasPCRelativeMemops() const { return HasPCRelativeMemops; }
+  bool pairedVectorMemops() const { return PairedVectorMemops; }
   bool hasMFOCRF() const { return HasMFOCRF; }
   bool hasISEL() const { return HasISEL; }
   bool hasBPERMD() const { return HasBPERMD; }
   bool hasExtDiv() const { return HasExtDiv; }
   bool hasCMPB() const { return HasCMPB; }
   bool hasLDBRX() const { return HasLDBRX; }
   bool isBookE() const { return IsBookE; }
   bool hasOnlyMSYNC() const { return HasOnlyMSYNC; }

llvm/lib/Target/PowerPC/PPCSubtarget.cpp

void PPCSubtarget::initializeEnvironment() {
   HasAddisLoadFusion = false;
   IsISA3_0 = false;
   IsISA3_1 = false;
   UseLongCalls = false;
   SecurePlt = false;
   VectorsUseTwoUnits = false;
   UsePPCPreRASchedStrategy = false;
   UsePPCPostRASchedStrategy = false;
+  PairedVectorMemops = false;
   PredictableSelectIsExpensive = false;
 
   HasPOPCNTD = POPCNTD_Unavailable;
 }
 
 void PPCSubtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
   // Determine default and user specified characteristics
   std::string CPUName = std::string(CPU);