diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86FastISel.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Target/X86/X86FastISel.cpp b/lib/Target/X86/X86FastISel.cpp index e3650af33b..94dec7ce35 100644 --- a/lib/Target/X86/X86FastISel.cpp +++ b/lib/Target/X86/X86FastISel.cpp @@ -31,6 +31,7 @@ #include "llvm/Support/CallSite.h" #include "llvm/Support/ErrorHandling.h" #include "llvm/Support/GetElementPtrTypeIterator.h" +#include "llvm/Target/TargetOptions.h" using namespace llvm; namespace { @@ -1243,6 +1244,11 @@ bool X86FastISel::X86SelectCall(Instruction *I) { CC != CallingConv::X86_FastCall) return false; + // fastcc with -tailcallopt is intended to provide a guaranteed + // tail call optimization. Fastisel doesn't know how to do that. + if (CC == CallingConv::Fast && PerformTailCallOpt) + return false; + // Let SDISel handle vararg functions. const PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType()); const FunctionType *FTy = cast<FunctionType>(PT->getElementType()); |