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https://github.com/c64scene-ar/llvm-6502.git
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cbf676b3ba
InstCombine was incorrectly considering the conversion of the constant
zero to be unsafe.
We want to transform:
define float @bar(float %x) nounwind readnone optsize ssp {
%conv = fpext float %x to double
%cmp = fcmp olt double %conv, 0.000000e+00
%conv1 = zext i1 %cmp to i32
%conv2 = sitofp i32 %conv1 to float
ret float %conv2
}
Into:
define float @bar(float %x) nounwind readnone optsize ssp {
%cmp = fcmp olt float %x, 0.000000e+00 ; <---- This
%conv1 = zext i1 %cmp to i32
%conv2 = sitofp i32 %conv1 to float
ret float %conv2
}
rdar://10215914
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140869 91177308-0d34-0410-b5e6-96231b3b80d8
72 lines
1.9 KiB
LLVM
72 lines
1.9 KiB
LLVM
; RUN: opt -S -instcombine < %s | FileCheck %s
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define i1 @test1(float %x, float %y) nounwind {
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%ext1 = fpext float %x to double
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%ext2 = fpext float %y to double
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%cmp = fcmp ogt double %ext1, %ext2
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ret i1 %cmp
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; CHECK: @test1
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; CHECK-NEXT: fcmp ogt float %x, %y
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}
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define i1 @test2(float %a) nounwind {
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%ext = fpext float %a to double
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%cmp = fcmp ogt double %ext, 1.000000e+00
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ret i1 %cmp
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; CHECK: @test2
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; CHECK-NEXT: fcmp ogt float %a, 1.0
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}
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define i1 @test3(float %a) nounwind {
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%ext = fpext float %a to double
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%cmp = fcmp ogt double %ext, 0x3FF0000000000001 ; more precision than float.
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ret i1 %cmp
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; CHECK: @test3
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; CHECK-NEXT: fpext float %a to double
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}
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define i1 @test4(float %a) nounwind {
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%ext = fpext float %a to double
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%cmp = fcmp ogt double %ext, 0x36A0000000000000 ; denormal in float.
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ret i1 %cmp
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; CHECK: @test4
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; CHECK-NEXT: fpext float %a to double
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}
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define i1 @test5(float %a) nounwind {
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%neg = fsub float -0.000000e+00, %a
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%cmp = fcmp ogt float %neg, 1.000000e+00
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ret i1 %cmp
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; CHECK: @test5
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; CHECK-NEXT: fcmp olt float %a, -1.0
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}
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define i1 @test6(float %x, float %y) nounwind {
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%neg1 = fsub float -0.000000e+00, %x
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%neg2 = fsub float -0.000000e+00, %y
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%cmp = fcmp olt float %neg1, %neg2
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ret i1 %cmp
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; CHECK: @test6
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; CHECK-NEXT: fcmp ogt float %x, %y
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}
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define i1 @test7(float %x) nounwind readnone ssp noredzone {
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%ext = fpext float %x to ppc_fp128
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%cmp = fcmp ogt ppc_fp128 %ext, 0xM00000000000000000000000000000000
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ret i1 %cmp
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; Can't convert ppc_fp128
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; CHECK: @test7
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; CHECK-NEXT: fpext float %x to ppc_fp128
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}
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define float @test8(float %x) nounwind readnone optsize ssp {
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%conv = fpext float %x to double
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%cmp = fcmp olt double %conv, 0.000000e+00
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%conv1 = zext i1 %cmp to i32
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%conv2 = sitofp i32 %conv1 to float
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ret float %conv2
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; Float comparison to zero shouldn't cast to double.
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; CHECK: @test8
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; CHECK-NEXT: fcmp olt float %x, 0.000000e+00
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}
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