[OpenMP] Remove doing assumption propagation in the front end.

[jhuber6]

Summary

This patch removes the assumption propagation that was added in D110655
primarily to get assumption informatino on opaque call sites for
optimizations. The analysis done in D111445 allows us to do this more
intelligently in the back-end.

Depends on D111445

[jdoerfert]

I'm assuming this is simply a revert, LG in that case, once the others landed.

clang/lib/CodeGen/CGCall.cpp

if (!FPT)
     return;
 
   if (!isUnresolvedExceptionSpec(FPT->getExceptionSpecType()) &&
       FPT->isNothrow())
     FuncAttrs.addAttribute(llvm::Attribute::NoUnwind);
 }
 
 static void AddAttributesFromAssumes(llvm::AttrBuilder &FuncAttrs,
-                                     const Decl *Callee, const Decl *Caller,
-                                     bool AssumptionOnCallSite) {
+                                     const Decl *Callee) {
   if (!Callee)
     return;
 
   SmallVector<StringRef, 4> Attrs;
 
   for (const AssumptionAttr *AA : Callee->specific_attrs<AssumptionAttr>())
     AA->getAssumption().split(Attrs, ",");
 
-  if (Caller && Caller->hasAttrs() && AssumptionOnCallSite)
-    for (const AssumptionAttr *AA : Caller->specific_attrs<AssumptionAttr>())
-      AA->getAssumption().split(Attrs, ",");
-
   if (!Attrs.empty())
     FuncAttrs.addAttribute(llvm::AssumptionAttrKey,
                            llvm::join(Attrs.begin(), Attrs.end(), ","));
 }
 
 bool CodeGenModule::MayDropFunctionReturn(const ASTContext &Context,
                                           QualType ReturnType) {
   // We can't just discard the return value for a record type with a

 ///     modules such as CUDA's libdevice.
 ///
 ///   - ConstructAttributeList builds on top of getDefaultFunctionAttributes
 ///     and adds declaration-specific, convention-specific, and
 ///     frontend-specific logic.  The last is of particular importance:
 ///     attributes that restrict how the frontend generates code must be
 ///     added here rather than getDefaultFunctionAttributes.
 ///
 void CodeGenModule::ConstructAttributeList(
     StringRef Name, const CGFunctionInfo &FI, CGCalleeInfo CalleeInfo,
     llvm::AttributeList &AttrList, unsigned &CallingConv, bool AttrOnCallSite,
-    bool IsThunk, const Decl *Caller) {
+    bool IsThunk) {
   llvm::AttrBuilder FuncAttrs;
   llvm::AttrBuilder RetAttrs;
 
   // Collect function IR attributes from the CC lowering.
   // We'll collect the paramete and result attributes later.
   CallingConv = FI.getEffectiveCallingConvention();
   if (FI.isNoReturn())
     FuncAttrs.addAttribute(llvm::Attribute::NoReturn);
   if (FI.isCmseNSCall())
     FuncAttrs.addAttribute("cmse_nonsecure_call");
 
   // Collect function IR attributes from the callee prototype if we have one.
   AddAttributesFromFunctionProtoType(getContext(), FuncAttrs,
                                      CalleeInfo.getCalleeFunctionProtoType());
 
   const Decl *TargetDecl = CalleeInfo.getCalleeDecl().getDecl();
 
-  // Only attach assumptions to call sites in OpenMP mode.
-  bool AssumptionOnCallSite = getLangOpts().OpenMP && AttrOnCallSite;
-
   // Attach assumption attributes to the declaration. If this is a call
   // site, attach assumptions from the caller to the call as well.
-  AddAttributesFromAssumes(FuncAttrs, TargetDecl, Caller, AssumptionOnCallSite);
+  AddAttributesFromAssumes(FuncAttrs, TargetDecl);
 
   bool HasOptnone = false;
   // The NoBuiltinAttr attached to the target FunctionDecl.
   const NoBuiltinAttr *NBA = nullptr;
 
   // Collect function IR attributes based on declaration-specific
   // information.
   // FIXME: handle sseregparm someday...
#endif
   }
 
   // Compute the calling convention and attributes.
   unsigned CallingConv;
   llvm::AttributeList Attrs;
   CGM.ConstructAttributeList(CalleePtr->getName(), CallInfo,
                              Callee.getAbstractInfo(), Attrs, CallingConv,
                              /*AttrOnCallSite=*/true,
-                             /*IsThunk=*/false, CurFuncDecl);
+                             /*IsThunk=*/false);
 
   if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(CurFuncDecl))
     if (FD->hasAttr<StrictFPAttr>())
       // All calls within a strictfp function are marked strictfp
       Attrs = Attrs.addFnAttribute(getLLVMContext(), llvm::Attribute::StrictFP);
 
   // Add call-site nomerge attribute if exists.
   if (InNoMergeAttributedStmt)

clang/lib/CodeGen/CGStmt.cpp

static void UpdateAsmCallInst(llvm::CallBase &Result, bool HasSideEffect,
   // Attach readnone and readonly attributes.
   if (!HasSideEffect) {
     if (ReadNone)
       Result.addFnAttr(llvm::Attribute::ReadNone);
     else if (ReadOnly)
       Result.addFnAttr(llvm::Attribute::ReadOnly);
   }
 
-  // Attach OpenMP assumption attributes from the caller, if they exist.
-  if (CGF.CGM.getLangOpts().OpenMP) {
-    SmallVector<StringRef, 4> Attrs;
-
-    for (const AssumptionAttr *AA :
-         CGF.CurFuncDecl->specific_attrs<AssumptionAttr>())
-      AA->getAssumption().split(Attrs, ",");
-
-    if (!Attrs.empty())
-      Result.addFnAttr(
-          llvm::Attribute::get(CGF.getLLVMContext(), llvm::AssumptionAttrKey,
-                               llvm::join(Attrs.begin(), Attrs.end(), ",")));
-  }
-
   // Slap the source location of the inline asm into a !srcloc metadata on the
   // call.
   if (const auto *gccAsmStmt = dyn_cast<GCCAsmStmt>(&S))
     Result.setMetadata("srcloc",
                        getAsmSrcLocInfo(gccAsmStmt->getAsmString(), CGF));
   else {
     // At least put the line number on MS inline asm blobs.
     llvm::Constant *Loc =

clang/lib/CodeGen/CGVTables.cpp

void CodeGenFunction::EmitMustTailThunk(GlobalDecl GD,
   llvm::CallInst *Call = Builder.CreateCall(Callee, Args);
   Call->setTailCallKind(llvm::CallInst::TCK_MustTail);
 
   // Apply the standard set of call attributes.
   unsigned CallingConv;
   llvm::AttributeList Attrs;
   CGM.ConstructAttributeList(Callee.getCallee()->getName(), *CurFnInfo, GD,
                              Attrs, CallingConv, /*AttrOnCallSite=*/true,
-                             /*IsThunk=*/false, CurFuncDecl);
+                             /*IsThunk=*/false);
   Call->setAttributes(Attrs);
   Call->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
 
   if (Call->getType()->isVoidTy())
     Builder.CreateRetVoid();
   else
     Builder.CreateRet(Call);
 

clang/lib/CodeGen/CodeGenModule.h

public:
   /// \param CalleeInfo - The callee information these attributes are being
   /// constructed for. If valid, the attributes applied to this decl may
   /// contribute to the function attributes and calling convention.
   /// \param Attrs [out] - On return, the attribute list to use.
   /// \param CallingConv [out] - On return, the LLVM calling convention to use.
   void ConstructAttributeList(StringRef Name, const CGFunctionInfo &Info,
                               CGCalleeInfo CalleeInfo,
                               llvm::AttributeList &Attrs, unsigned &CallingConv,
-                              bool AttrOnCallSite, bool IsThunk,
-                              const Decl *Caller = nullptr);
+                              bool AttrOnCallSite, bool IsThunk);
 
   /// Adds attributes to F according to our CodeGenOptions and LangOptions, as
   /// though we had emitted it ourselves.  We remove any attributes on F that
   /// conflict with the attributes we add here.
   ///
   /// This is useful for adding attrs to bitcode modules that you want to link
   /// with but don't control, such as CUDA's libdevice.  When linking with such
   /// a bitcode library, you might want to set e.g. its functions'

clang/test/OpenMP/assumes_codegen.cpp

 
 #pragma omp begin assumes ext_lambda_assumption
 int lambda_outer() {
   auto lambda_inner = []() { return 42; };
   return lambda_inner();
 }
 #pragma omp end assumes
 
-void no_assume() {
-  foo();
-}
-
-#pragma omp begin assumes ext_call_site
-void assume() {
-  foo();
-}
-
-void assembly() {
-  asm ("nop");
-}
-#pragma omp end assumes ext_call_site
-
 // AST:      void foo() __attribute__((assume("omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses"))) __attribute__((assume("omp_no_openmp"))) {
 // AST-NEXT: }
 // AST-NEXT: class BAR {
 // AST-NEXT: public:
 // AST-NEXT:     BAR() __attribute__((assume("ompx_range_bar_only"))) __attribute__((assume("ompx_range_bar_only_2"))) __attribute__((assume("omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses"))) __attribute__((assume("omp_no_openmp")))     {
 // AST-NEXT:     }
 // AST-NEXT:     void bar1() __attribute__((assume("ompx_range_bar_only"))) __attribute__((assume("ompx_range_bar_only_2"))) __attribute__((assume("omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses"))) __attribute__((assume("omp_no_openmp")))     {
 // AST-NEXT:     }

 
 #endif
 
 // CHECK: define{{.*}} void @_Z3foov()
 // CHECK-SAME: [[attr0:#[0-9]]]
 // CHECK: define{{.*}} void @_Z3barv()
 // CHECK-SAME: [[attr1:#[0-9]]]
 // CHECK:   call{{.*}} @_ZN3BARC1Ev(%class.BAR*{{.*}} %b)
-// CHECK-SAME: [[attr10:#[0-9]]]
+// CHECK-SAME: [[attr9:#[0-9]]]
 // CHECK: define{{.*}} void @_ZN3BARC1Ev(%class.BAR*{{.*}} %this)
 // CHECK-SAME: [[attr2:#[0-9]]]
 // CHECK:   call{{.*}} @_ZN3BARC2Ev(%class.BAR*{{.*}} %this1)
-// CHECK-SAME: [[attr10]]
+// CHECK-SAME: [[attr9]]
 // CHECK: define{{.*}} void @_ZN3BARC2Ev(%class.BAR*{{.*}} %this)
 // CHECK-SAME: [[attr3:#[0-9]]]
 // CHECK: define{{.*}} void @_Z3bazv()
 // CHECK-SAME: [[attr4:#[0-9]]]
 // CHECK:   call{{.*}} @_ZN3BAZIfEC1Ev(%class.BAZ*{{.*}} %b)
-// CHECK-SAME: [[attr11:#[0-9]]]
+// CHECK-SAME: [[attr10:#[0-9]]]
 // CHECK: define{{.*}} void @_ZN3BAZIfEC1Ev(%class.BAZ*{{.*}} %this)
 // CHECK-SAME: [[attr5:#[0-9]]]
 // CHECK:   call{{.*}} @_ZN3BAZIfEC2Ev(%class.BAZ*{{.*}} %this1)
-// CHECK-SAME: [[attr12:#[0-9]]]
+// CHECK-SAME: [[attr10]]
 // CHECK: define{{.*}} void @_ZN3BAZIfEC2Ev(%class.BAZ*{{.*}} %this)
 // CHECK-SAME: [[attr6:#[0-9]]]
 // CHECK: define{{.*}} i32 @_Z12lambda_outerv()
 // CHECK-SAME: [[attr7:#[0-9]]]
 // CHECK: call{{.*}} @"_ZZ12lambda_outervENK3$_0clEv"
-// CHECK-SAME: [[attr13:#[0-9]]]
+// CHECK-SAME: [[attr11:#[0-9]]]
 // CHECK: define{{.*}} i32 @"_ZZ12lambda_outervENK3$_0clEv"(%class.anon*{{.*}} %this)
 // CHECK-SAME: [[attr8:#[0-9]]]
-// CHECK: define{{.*}} void @_Z9no_assumev()
-// CHECK-SAME: [[attr0:#[0-9]]]
-// CHECK: call{{.*}} @_Z3foov()
-// CHECK-SAME: [[attr14:#[0-9]]]
-// CHECK: define{{.*}} void @_Z6assumev()
-// CHECK-SAME: [[attr9:#[0-9]]]
-// CHECK: call{{.*}} @_Z3foov()
-// CHECK-SAME: [[attr15:#[0-9]]]
-// CHECK: define{{.*}} void @_Z8assemblyv()
-// CHECK-SAME: [[attr9:#[0-9]]]
-// CHECK: call{{.*}} void asm sideeffect "nop", "~{dirflag},~{fpsr},~{flags}"()
-// CHECK-SAME: [[attr16:#[0-9]]]
 
 // CHECK:     attributes [[attr0]]
 // CHECK-SAME:  "llvm.assume"="omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
 // CHECK:     attributes [[attr1]]
 // CHECK-SAME:  "llvm.assume"="ompx_range_bar_only,ompx_range_bar_only_2,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
 // CHECK:     attributes [[attr2]]
 // CHECK-SAME:  "llvm.assume"="ompx_range_bar_only,ompx_range_bar_only_2,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
 // CHECK:     attributes [[attr3]]
 // CHECK-SAME:  "llvm.assume"="ompx_range_bar_only,ompx_range_bar_only_2,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
 // CHECK:     attributes [[attr4]]
 // CHECK-SAME:  "llvm.assume"="ompx_1234,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp,ompx_1234,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
 // CHECK:     attributes [[attr5]]
 // CHECK-SAME:  "llvm.assume"="ompx_1234,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
 // CHECK:     attributes [[attr6]]
 // CHECK-SAME:  "llvm.assume"="ompx_1234,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
 // CHECK:     attributes [[attr7]]
 // CHECK-SAME:  "llvm.assume"="ompx_lambda_assumption,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
 // CHECK:     attributes [[attr8]]
 // CHECK-SAME:  "llvm.assume"="ompx_lambda_assumption,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
 // CHECK:     attributes [[attr9]]
-// CHECK-SAME:  "llvm.assume"="ompx_call_site,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
+// CHECK-SAME:  "llvm.assume"="ompx_range_bar_only,ompx_range_bar_only_2,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
 // CHECK:     attributes [[attr10]]
-// CHECK-SAME:  "llvm.assume"="ompx_range_bar_only,ompx_range_bar_only_2,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp,ompx_range_bar_only,ompx_range_bar_only_2,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
+// CHECK-SAME:  "llvm.assume"="ompx_1234,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
 // CHECK:     attributes [[attr11]]
-// CHECK-SAME:  "llvm.assume"="ompx_1234,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp,ompx_1234,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp,ompx_1234,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
-// CHECK:     attributes [[attr12]]
-// CHECK-SAME:  "llvm.assume"="ompx_1234,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp,ompx_1234,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
-// CHECK:     attributes [[attr13]]
-// CHECK-SAME:  "llvm.assume"="ompx_lambda_assumption,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp,ompx_lambda_assumption,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
-// CHECK:     attributes [[attr14]]
-// CHECK-SAME:  "llvm.assume"="omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
-// CHECK:     attributes [[attr15]]
-// CHECK-SAME:  "llvm.assume"="omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp,ompx_call_site,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
-// CHECK:     attributes [[attr16]]
-// CHECK-SAME:  "llvm.assume"="ompx_call_site,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"
+// CHECK-SAME:  "llvm.assume"="ompx_lambda_assumption,omp_no_openmp_routines,ompx_another_warning,ompx_after_invalid_clauses,omp_no_openmp"

clang/test/OpenMP/assumes_include_nvptx.cpp

 // CHECK: %call = call double @_Z3sind(double 0.000000e+00) [[attr2:#[0-9]]]
 // CHECK: declare double @_Z3sind(double) [[attr1]]
 
 // CHECK:       attributes [[attr0]]
 // CHECK-NOT:  "llvm.assume"
 // CHECK:       attributes [[attr1]]
 // CHECK-SAME:  "llvm.assume"="ompx_check_that_this_is_attached_to_included_functions_and_template_instantiations"
 // CHECK:       attributes [[attr2]]
-// CHECK-SAME:  "llvm.assume"="ompx_check_that_this_is_attached_to_included_functions_and_template_instantiations,ompx_check_that_this_is_attached_to_included_functions_and_template_instantiations"
+// CHECK-SAME:  "llvm.assume"="ompx_check_that_this_is_attached_to_included_functions_and_template_instantiations"
 
 
 template <typename T>
 void foo() {
   cos(T(0));
 }
 
 template <typename T>