Reapply af57dbf12e54 "Add support for options -frounding-math, ftrapping-math, -ffp-model=, and -ffp-exception-behavior="

        Patch was reverted because https://bugs.llvm.org/show_bug.cgi?id=44048
        The original patch is modified to set the strictfp IR attribute
        explicitly in CodeGen instead of as a side effect of IRBuilder

        Differential Revision: https://reviews.llvm.org/D62731

1 files changed, 14 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
index ca6b1d409c2..657c9260e6e 100644
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -4336,6 +4336,13 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
                              Callee.getAbstractInfo(), Attrs, CallingConv,
                              /*AttrOnCallSite=*/true);
 
+  if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(CurFuncDecl))
+    if (FD->usesFPIntrin())
+      // All calls within a strictfp function are marked strictfp
+      Attrs =
+        Attrs.addAttribute(getLLVMContext(), llvm::AttributeList::FunctionIndex,
+                           llvm::Attribute::StrictFP);
+
   // Apply some call-site-specific attributes.
   // TODO: work this into building the attribute set.
 
@@ -4385,6 +4392,13 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
   SmallVector<llvm::OperandBundleDef, 1> BundleList =
       getBundlesForFunclet(CalleePtr);
 
+  if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(CurFuncDecl))
+    if (FD->usesFPIntrin())
+      // All calls within a strictfp function are marked strictfp
+      Attrs =
+        Attrs.addAttribute(getLLVMContext(), llvm::AttributeList::FunctionIndex,
+                           llvm::Attribute::StrictFP);
+
   // Emit the actual call/invoke instruction.
   llvm::CallBase *CI;
   if (!InvokeDest) {