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Don't attempt to tail call optimize for Win64.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131709 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2531,17 +2531,18 @@ X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee,
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return false;
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// Do not sibcall optimize vararg calls unless all arguments are passed via
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// registers
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// registers.
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if (isVarArg && !Outs.empty()) {
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// Optimizing for varargs on Win64 is unlikely to be safe without
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// additional testing.
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if (Subtarget->isTargetWin64())
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return false;
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SmallVector<CCValAssign, 16> ArgLocs;
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CCState CCInfo(CalleeCC, isVarArg, getTargetMachine(),
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ArgLocs, *DAG.getContext());
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// Allocate shadow area for Win64
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if (Subtarget->isTargetWin64()) {
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CCInfo.AllocateStack(32, 8);
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}
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CCInfo.AnalyzeCallOperands(Outs, CC_X86);
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for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i)
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if (!ArgLocs[i].isRegLoc())
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@ -12,7 +12,7 @@
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; X64: @foo
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; X64: jmp
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; WIN64: @foo
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; WIN64: jmp
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; WIN64: callq
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define void @foo(i64 %arg) nounwind optsize ssp noredzone {
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entry:
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%call = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([5 x i8]* @.str, i64 0, i64 0), i64 %arg) nounwind optsize noredzone
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@ -36,7 +36,7 @@ declare void @bar2(i8*, i64) optsize noredzone
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; X64: @foo2
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; X64: jmp
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; WIN64: @foo2
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; WIN64: jmp
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; WIN64: callq
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define i8* @foo2(i8* %arg) nounwind optsize ssp noredzone {
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entry:
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%tmp1 = load i8** @sel, align 8, !tbaa !0
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