[clang] Enable support for #pragma STDC FENV_ACCESS

Reviewers: rjmccall, rsmith, sepavloff

Differential Revision: https://reviews.llvm.org/D87528

1 files changed, 12 insertions, 1 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 809e877..a1511e0 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -1742,6 +1742,15 @@ void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
   }
 }
 
+void CodeGenModule::setLLVMFunctionFEnvAttributes(const FunctionDecl *D,
+                                                  llvm::Function *F) {
+  if (D->hasAttr<StrictFPAttr>()) {
+    llvm::AttrBuilder FuncAttrs;
+    FuncAttrs.addAttribute("strictfp");
+    F->addAttributes(llvm::AttributeList::FunctionIndex, FuncAttrs);
+  }
+}
+
 void CodeGenModule::SetCommonAttributes(GlobalDecl GD, llvm::GlobalValue *GV) {
   const Decl *D = GD.getDecl();
   if (dyn_cast_or_null<NamedDecl>(D))
@@ -4587,9 +4596,11 @@ void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD,
 
   MaybeHandleStaticInExternC(D, Fn);
 
-
   maybeSetTrivialComdat(*D, *Fn);
 
+  // Set CodeGen attributes that represent floating point environment.
+  setLLVMFunctionFEnvAttributes(D, Fn);
+
   CodeGenFunction(*this).GenerateCode(GD, Fn, FI);
 
   setNonAliasAttributes(GD, Fn);