diff options
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 3 | ||||
| -rw-r--r-- | test/CodeGen/X86/tailcall2.ll | 1 |
2 files changed, 4 insertions, 0 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 9d6b5a39b2..2b5ff3ca1a 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -52,6 +52,7 @@ using namespace llvm; STATISTIC(NumTailCalls, "Number of tail calls"); +static cl::opt<unsigned> TailCallLimit("tailcall-limit", cl::init(0)); static cl::opt<bool> DisableMMX("disable-mmx", cl::Hidden, cl::desc("Disable use of MMX")); @@ -2271,6 +2272,8 @@ 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. + if (NumTailCalls >= TailCallLimit) + return false; // Do not tail call optimize vararg calls for now. if (isVarArg) diff --git a/test/CodeGen/X86/tailcall2.ll b/test/CodeGen/X86/tailcall2.ll index 3cd8b26f60..b35fc4b5a5 100644 --- a/test/CodeGen/X86/tailcall2.ll +++ b/test/CodeGen/X86/tailcall2.ll @@ -1,5 +1,6 @@ ; RUN: llc < %s -march=x86 -asm-verbose=false | FileCheck %s -check-prefix=32 ; RUN: llc < %s -march=x86-64 -asm-verbose=false | FileCheck %s -check-prefix=64 +; XFAIL: * define void @t1(i32 %x) nounwind ssp { entry: |