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Speculatively disable x86 automatic tail call optimization while we track down a self-hosting issue.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95259 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-02-03 21:40:40 +00:00
parent 394f1b5334
commit 8148ae8847
2 changed files with 4 additions and 0 deletions
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3
lib/Target/X86/X86ISelLowering.cpp
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@ -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)

1
test/CodeGen/X86/tailcall2.ll
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@ -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: