Do not sibcall if stack needs to be dynamically aligned.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99620 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index d08dfc4..707b9fe 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -2290,6 +2290,7 @@
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) &&
@@ -2301,6 +2302,11 @@
// 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 unless the call site is not passing any
// arguments.
if (isVarArg && !Outs.empty())