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Fix PR4185.

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Handle FpSET_ST0_80 being used when ST0 is still alive.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73850 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2009-06-21 12:02:51 +00:00
parent 4577bbaa12
commit 1c3329f707
2 changed files with 17 additions and 2 deletions
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9
lib/Target/X86/X86FloatingPoint.cpp
View File

@ -991,8 +991,13 @@ void FPS::handleSpecialFP(MachineBasicBlock::iterator &I) {
case X86::FpSET_ST0_32:
case X86::FpSET_ST0_64:
case X86::FpSET_ST0_80:
assert((StackTop == 1 || StackTop == 2)
&& "Stack should have one or two element on it to return!");
// FpSET_ST0_80 is generated by copyRegToReg for both function return
// and inline assembly with the "st" constrain. In the latter case,
// it is possible for FP0 to be alive after this instruction.
if (!MI->killsRegister(X86::FP0)) {
// Duplicate ST0
duplicateToTop(0, 0, I);
}
--StackTop; // "Forget" we have something on the top of stack!
break;
case X86::FpSET_ST1_32:

10
test/CodeGen/X86/inline-asm-fpstack2.ll Normal file
View File

@ -0,0 +1,10 @@
; RUN: llvm-as < %s | llc -march=x86 > %t
; RUN: grep {fld %%st(0)} %t
; PR4185
define void @test() {
return:
call void asm sideeffect "fistpl $0", "{st}"(double 1.000000e+06)
call void asm sideeffect "fistpl $0", "{st}"(double 1.000000e+06)
ret void
}