diff options
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 6 | ||||
| -rw-r--r-- | test/CodeGen/X86/sibcall.ll | 13 |
2 files changed, 19 insertions, 0 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index ae06ee44e6..adffb42bbe 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -2307,6 +2307,7 @@ X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee, return false; // If -tailcallopt is specified, make fastcc functions tail-callable. + const MachineFunction &MF = DAG.getMachineFunction(); const Function *CallerF = DAG.getMachineFunction().getFunction(); if (GuaranteedTailCallOpt) { if (IsTailCallConvention(CalleeCC) && @@ -2318,6 +2319,11 @@ X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee, // Look for obvious safe cases to perform tail call optimization that does not // requite ABI changes. This is what gcc calls sibcall. + // Can't do sibcall if stack needs to be dynamically re-aligned. PEI needs to + // emit a special epilogue. + if (RegInfo->needsStackRealignment(MF)) + return false; + // Do not sibcall optimize vararg calls for now. if (isVarArg) return false; diff --git a/test/CodeGen/X86/sibcall.ll b/test/CodeGen/X86/sibcall.ll index 90315fd2f2..108e5226ad 100644 --- a/test/CodeGen/X86/sibcall.ll +++ b/test/CodeGen/X86/sibcall.ll @@ -216,3 +216,16 @@ entry: } declare fastcc %struct.ns* @foo7(%struct.cp* byval align 4, i8 signext) nounwind ssp + + + +define void @t19() alignstack(32) nounwind { +entry: +; CHECK: t19: +; CHECK: andl $-32 +; CHECK: call {{_?}}foo + tail call void @foo() nounwind + ret void +} + +declare void @foo() |