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FIX PR 4459.

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Not sure I understand how the temp register gets used,
but this fixes a bug and introduces no regressions.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74446 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2009-06-29 20:29:59 +00:00
parent cf048d4e59
commit 63de5c3b7e
2 changed files with 16 additions and 1 deletions
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2
lib/Target/X86/X86FloatingPoint.cpp
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@ -996,7 +996,7 @@ void FPS::handleSpecialFP(MachineBasicBlock::iterator &I) {
// it is possible for FP0 to be alive after this instruction.
if (!MI->killsRegister(X86::FP0)) {
// Duplicate ST0
duplicateToTop(0, 0, I);
duplicateToTop(0, 7 /*temp register*/, I);
}
--StackTop; // "Forget" we have something on the top of stack!
break;

15
test/CodeGen/X86/inline-asm-fpstack3.ll Normal file
View File

@ -0,0 +1,15 @@
; RUN: llvm-as < %s | llc -march=x86 > %t
; RUN: grep {fld %%st(0)} %t
; PR4459
declare x86_fp80 @ceil(x86_fp80)
declare void @test(x86_fp80)
define void @test2(x86_fp80 %a) {
entry:
%0 = call x86_fp80 @ceil(x86_fp80 %a)
call void asm sideeffect "fistpl $0", "{st}"( x86_fp80 %0)
call void @test(x86_fp80 %0 )
ret void
}