[OPENMP][NVPTX]Mark more functions as always_inline for better

performance.

Internally generated functions must be marked as always_inlines in most
cases. Patch marks some extra reduction function + outlined parallel
functions as always_inline for better performance, but only if the
optimization is requested.

llvm-svn: 361269

Author: alexey-bataev

clang/lib/CodeGen/CGOpenMPRuntime.cpp

@@ -1274,9 +1274,11 @@ emitCombinerOrInitializer(CodeGenModule &CGM, QualType Ty,
   auto *Fn = llvm::Function::Create(FnTy, llvm::GlobalValue::InternalLinkage,
                                     Name, &CGM.getModule());
   CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, FnInfo);
-  Fn->removeFnAttr(llvm::Attribute::NoInline);
-  Fn->removeFnAttr(llvm::Attribute::OptimizeNone);
-  Fn->addFnAttr(llvm::Attribute::AlwaysInline);
+  if (CGM.getLangOpts().Optimize) {
+    Fn->removeFnAttr(llvm::Attribute::NoInline);
+    Fn->removeFnAttr(llvm::Attribute::OptimizeNone);
+    Fn->addFnAttr(llvm::Attribute::AlwaysInline);
+  }
   CodeGenFunction CGF(CGM);
   // Map "T omp_in;" variable to "*omp_in_parm" value in all expressions.
   // Map "T omp_out;" variable to "*omp_out_parm" value in all expressions.
@@ -4671,9 +4673,11 @@ emitTaskPrivateMappingFunction(CodeGenModule &CGM, SourceLocation Loc,
       &CGM.getModule());
   CGM.SetInternalFunctionAttributes(GlobalDecl(), TaskPrivatesMap,
                                     TaskPrivatesMapFnInfo);
-  TaskPrivatesMap->removeFnAttr(llvm::Attribute::NoInline);
-  TaskPrivatesMap->removeFnAttr(llvm::Attribute::OptimizeNone);
-  TaskPrivatesMap->addFnAttr(llvm::Attribute::AlwaysInline);
+  if (CGM.getLangOpts().Optimize) {
+    TaskPrivatesMap->removeFnAttr(llvm::Attribute::NoInline);
+    TaskPrivatesMap->removeFnAttr(llvm::Attribute::OptimizeNone);
+    TaskPrivatesMap->addFnAttr(llvm::Attribute::AlwaysInline);
+  }
   CodeGenFunction CGF(CGM);
   CGF.StartFunction(GlobalDecl(), C.VoidTy, TaskPrivatesMap,
                     TaskPrivatesMapFnInfo, Args, Loc, Loc);

clang/lib/CodeGen/CGOpenMPRuntimeNVPTX.cpp

@@ -1929,6 +1929,11 @@ llvm::Function *CGOpenMPRuntimeNVPTX::emitParallelOutlinedFunction(
   auto *OutlinedFun =
       cast<llvm::Function>(CGOpenMPRuntime::emitParallelOutlinedFunction(
           D, ThreadIDVar, InnermostKind, CodeGen));
+  if (CGM.getLangOpts().Optimize) {
+    OutlinedFun->removeFnAttr(llvm::Attribute::NoInline);
+    OutlinedFun->removeFnAttr(llvm::Attribute::OptimizeNone);
+    OutlinedFun->addFnAttr(llvm::Attribute::AlwaysInline);
+  }
   IsInTargetMasterThreadRegion = PrevIsInTargetMasterThreadRegion;
   IsInTTDRegion = PrevIsInTTDRegion;
   if (getExecutionMode() != CGOpenMPRuntimeNVPTX::EM_SPMD &&
@@ -2045,9 +2050,11 @@ llvm::Function *CGOpenMPRuntimeNVPTX::emitTeamsOutlinedFunction(
   CodeGen.setAction(Action);
   llvm::Function *OutlinedFun = CGOpenMPRuntime::emitTeamsOutlinedFunction(
       D, ThreadIDVar, InnermostKind, CodeGen);
-  OutlinedFun->removeFnAttr(llvm::Attribute::NoInline);
-  OutlinedFun->removeFnAttr(llvm::Attribute::OptimizeNone);
-  OutlinedFun->addFnAttr(llvm::Attribute::AlwaysInline);
+  if (CGM.getLangOpts().Optimize) {
+    OutlinedFun->removeFnAttr(llvm::Attribute::NoInline);
+    OutlinedFun->removeFnAttr(llvm::Attribute::OptimizeNone);
+    OutlinedFun->addFnAttr(llvm::Attribute::AlwaysInline);
+  }
 
   return OutlinedFun;
 }
@@ -3422,6 +3429,12 @@ static llvm::Function *emitShuffleAndReduceFunction(
       "_omp_reduction_shuffle_and_reduce_func", &CGM.getModule());
   CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI);
   Fn->setDoesNotRecurse();
+  if (CGM.getLangOpts().Optimize) {
+    Fn->removeFnAttr(llvm::Attribute::NoInline);
+    Fn->removeFnAttr(llvm::Attribute::OptimizeNone);
+    Fn->addFnAttr(llvm::Attribute::AlwaysInline);
+  }
+
   CodeGenFunction CGF(CGM);
   CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc);
 

clang/test/OpenMP/declare_target_codegen_globalization.cpp

@@ -1,5 +1,5 @@
 // RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -emit-llvm-bc %s -o %t-ppc-host.bc
-// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple nvptx64-nvidia-cuda -fopenmp-targets=nvptx64-nvidia-cuda -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - | FileCheck %s
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple nvptx64-nvidia-cuda -fopenmp-targets=nvptx64-nvidia-cuda -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - -disable-llvm-optzns | FileCheck %s
 // expected-no-diagnostics
 
 int foo(int &a) { return a; }