Revert "Add support for #pragma float_control"

This reverts commit 4f1e9a17e9d28bdfd035313c96b3a5d4c91a7733.
due to fail on buildbot, sorry for the noise

1 files changed, 12 insertions, 9 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index 4fcf31a..24e01c4 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -117,8 +117,8 @@ CodeGenFunction::~CodeGenFunction() {
 
 // Map the LangOption for exception behavior into
 // the corresponding enum in the IR.
-llvm::fp::ExceptionBehavior
-clang::ToConstrainedExceptMD(LangOptions::FPExceptionModeKind Kind) {
+static llvm::fp::ExceptionBehavior ToConstrainedExceptMD(
+  LangOptions::FPExceptionModeKind Kind) {
 
   switch (Kind) {
   case LangOptions::FPE_Ignore:  return llvm::fp::ebIgnore;
@@ -133,10 +133,15 @@ void CodeGenFunction::SetFPModel() {
   auto fpExceptionBehavior = ToConstrainedExceptMD(
                                getLangOpts().getFPExceptionMode());
 
-  Builder.setDefaultConstrainedRounding(RM);
-  Builder.setDefaultConstrainedExcept(fpExceptionBehavior);
-  Builder.setIsFPConstrained(fpExceptionBehavior != llvm::fp::ebIgnore ||
-                             RM != llvm::RoundingMode::NearestTiesToEven);
+  if (fpExceptionBehavior == llvm::fp::ebIgnore &&
+      RM == llvm::RoundingMode::NearestTiesToEven)
+    // Constrained intrinsics are not used.
+    ;
+  else {
+    Builder.setIsFPConstrained(true);
+    Builder.setDefaultConstrainedRounding(RM);
+    Builder.setDefaultConstrainedExcept(fpExceptionBehavior);
+  }
 }
 
 CharUnits CodeGenFunction::getNaturalPointeeTypeAlignment(QualType T,
@@ -914,11 +919,9 @@ void CodeGenFunction::StartFunction(GlobalDecl GD, QualType RetTy,
       Fn->addFnAttr(llvm::Attribute::NoRecurse);
   }
 
-  if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
-    Builder.setIsFPConstrained(FD->usesFPIntrin());
+  if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D))
     if (FD->usesFPIntrin())
       Fn->addFnAttr(llvm::Attribute::StrictFP);
-  }
 
   // If a custom alignment is used, force realigning to this alignment on
   // any main function which certainly will need it.