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Re-enable x86 tail call optimization.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95295 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-02-04 06:47:24 +00:00
parent e7b97471f8
commit 1f2fda97b1
2 changed files with 2 additions and 6 deletions
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3
lib/Target/X86/X86ISelLowering.cpp
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@ -52,7 +52,6 @@ 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"));
@ -2271,8 +2270,6 @@ 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)

5
test/CodeGen/X86/tailcall2.ll
View File

@ -1,6 +1,5 @@
; 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:
@ -107,10 +106,10 @@ declare i32 @bar2(i32, i32, i32)
define signext i16 @t8() nounwind ssp {
entry:
; 32: t8:
; 32: jmp {{_?}}bar3
; 32: call {{_?}}bar3
; 64: t8:
; 64: jmp {{_?}}bar3
; 64: callq {{_?}}bar3
%0 = tail call signext i16 @bar3() nounwind ; <i16> [#uses=1]
ret i16 %0
}