From 552f8c4819dba0970591da3c15532f76eb42aea2 Mon Sep 17 00:00:00 2001 From: Chad Rosier Date: Fri, 20 May 2011 00:59:28 +0000 Subject: Don't attempt to tail call optimize for Win64. llvm-svn: 131709 --- llvm/lib/Target/X86/X86ISelLowering.cpp | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) (limited to 'llvm/lib') diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index e5156f8d413..ce1dc09760a 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -2531,17 +2531,18 @@ X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee, return false; // Do not sibcall optimize vararg calls unless all arguments are passed via - // registers + // registers. if (isVarArg && !Outs.empty()) { + + // Optimizing for varargs on Win64 is unlikely to be safe without + // additional testing. + if (Subtarget->isTargetWin64()) + return false; + SmallVector ArgLocs; CCState CCInfo(CalleeCC, isVarArg, getTargetMachine(), ArgLocs, *DAG.getContext()); - // Allocate shadow area for Win64 - if (Subtarget->isTargetWin64()) { - CCInfo.AllocateStack(32, 8); - } - CCInfo.AnalyzeCallOperands(Outs, CC_X86); for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) if (!ArgLocs[i].isRegLoc()) -- cgit v1.2.3