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| author | Evan Cheng <evan.cheng@apple.com> | 2010-02-03 21:40:40 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2010-02-03 21:40:40 +0000 |
| commit | 8148ae8847f849e2e1f7d9278b67e7fc9cae6eac (patch) | |
| tree | 044f954d2fadd264b71c7c7249003f379c51521b | |
| parent | 394f1b53342ee70b8c5ed80c143871cc41dc39b7 (diff) | |
Speculatively disable x86 automatic tail call optimization while we track down a self-hosting issue.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95259 91177308-0d34-0410-b5e6-96231b3b80d8
| -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: |