diff options
| -rw-r--r-- | lib/Target/X86/X86FastISel.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/Target/X86/X86FastISel.cpp b/lib/Target/X86/X86FastISel.cpp index 10fba2461e..7e02d59c1b 100644 --- a/lib/Target/X86/X86FastISel.cpp +++ b/lib/Target/X86/X86FastISel.cpp @@ -1230,8 +1230,8 @@ bool X86FastISel::X86SelectCall(Instruction *I) { CC != CallingConv::X86_FastCall) return false; - // On X86, -tailcallopt changes the fastcc ABI. FastISel doesn't - // handle this for now. + // 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; |