[llvm-branch-commits] [llvm-branch] r99955 - in /llvm/branches/release_27: lib/Target/X86/X86ISelLowering.cpp test/CodeGen/X86/sibcall.ll
Tanya Lattner
tonic at nondot.org
Tue Mar 30 16:01:26 PDT 2010
Author: tbrethou
Date: Tue Mar 30 18:01:26 2010
New Revision: 99955
URL: http://llvm.org/viewvc/llvm-project?rev=99955&view=rev
Log:
Merge 99620 from mainline.
Do not sibcall if stack needs to be dynamically aligned.
Modified:
llvm/branches/release_27/lib/Target/X86/X86ISelLowering.cpp
llvm/branches/release_27/test/CodeGen/X86/sibcall.ll
Modified: llvm/branches/release_27/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/branches/release_27/lib/Target/X86/X86ISelLowering.cpp?rev=99955&r1=99954&r2=99955&view=diff
==============================================================================
--- llvm/branches/release_27/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/branches/release_27/lib/Target/X86/X86ISelLowering.cpp Tue Mar 30 18:01:26 2010
@@ -2307,6 +2307,7 @@
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) &&
@@ -2318,6 +2319,11 @@
// 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 for now.
if (isVarArg)
return false;
Modified: llvm/branches/release_27/test/CodeGen/X86/sibcall.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/branches/release_27/test/CodeGen/X86/sibcall.ll?rev=99955&r1=99954&r2=99955&view=diff
==============================================================================
--- llvm/branches/release_27/test/CodeGen/X86/sibcall.ll (original)
+++ llvm/branches/release_27/test/CodeGen/X86/sibcall.ll Tue Mar 30 18:01:26 2010
@@ -216,3 +216,16 @@
}
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()
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