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InstCombine: APFloat can't perform arithmetic on PPC double doubles, don't even try. 

Thanks Eli!

llvm-svn: 128676
This commit is contained in:
Benjamin Kramer 2011-03-31 21:35:49 +00:00
parent d20c8d1a17
commit 5291054ef1
2 changed files with 13 additions and 2 deletions
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6
llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
View File

@ -2769,6 +2769,10 @@ Instruction *InstCombiner::visitFCmpInst(FCmpInst &I) {
if (!RHSF)
break;
// We can't convert a PPC double double.
if (RHSF->getType()->isPPC_FP128Ty())
break;
const fltSemantics *Sem;
// FIXME: This shouldn't be here.
if (LHSExt->getSrcTy()->isFloatTy())
@ -2779,8 +2783,6 @@ Instruction *InstCombiner::visitFCmpInst(FCmpInst &I) {
Sem = &APFloat::IEEEquad;
else if (LHSExt->getSrcTy()->isX86_FP80Ty())
Sem = &APFloat::x87DoubleExtended;
else if (LHSExt->getSrcTy()->isPPC_FP128Ty())
Sem = &APFloat::PPCDoubleDouble;
else
break;

9
llvm/test/Transforms/InstCombine/fcmp.ll
View File

@ -49,3 +49,12 @@ define i1 @test6(float %x, float %y) nounwind {
; CHECK: @test6
; CHECK-NEXT: fcmp ogt float %x, %y
}
define i1 @test7(float %x) nounwind readnone ssp noredzone {
%ext = fpext float %x to ppc_fp128
%cmp = fcmp ogt ppc_fp128 %ext, 0xM00000000000000000000000000000000
ret i1 %cmp
; Can't convert ppc_fp128
; CHECK: @test7
; CHECK-NEXT: fpext float %x to ppc_fp128
}