commit 22de16dc7582dac43429ce0dcb374604020c01f5
author Nick Lewycky <nicholas@mxc.ca> Thu Jan 19 00:34:10 2012 +0000
committer Nick Lewycky <nicholas@mxc.ca> Thu Jan 19 00:34:10 2012 +0000
tree cdf90f822164c39bf7a6c99518381a49b0cbf7b7
parent 9b159710ebe8a37cba38ca0c5b465e362bd68af7

Add a TargetOption for disabling tail calls.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148442 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86ISelLowering.cpp

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 91dc7b5..858ebc5 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -1732,7 +1732,7 @@
 }
 
 bool X86TargetLowering::mayBeEmittedAsTailCall(CallInst *CI) const {
-  if (!CI->isTailCall())
+  if (!CI->isTailCall() || getTargetMachine().Options.DisableTailCalls)
     return false;
 
   CallSite CS(CI);
@@ -2133,6 +2133,9 @@
   bool IsStructRet    = CallIsStructReturn(Outs);
   bool IsSibcall      = false;
 
+  if (MF.getTarget().Options.DisableTailCalls)
+    isTailCall = false;
+
   if (isTailCall) {
     // Check if it's really possible to do a tail call.
     isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv,