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In these cases, two selects have constant selectable operands for both the true and false components and have the same conditional expression. We then create two arithmetic operations of the same type and feed a final select operation using the result of the true arithmetic for the true operand and the result of the false arithmetic for the false operand and reuse the original conditionl expression. The arithmetic operations are naturally folded as a consequence, leaving only the newly formed select to replace the old arithmetic operation. Patch by: Michael Berg <michael_c_berg@apple.com> Differential Revision: https://reviews.llvm.org/D37019 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313774 91177308-0d34-0410-b5e6-96231b3b80d8
41 lines
1.4 KiB
LLVM
41 lines
1.4 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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; Tests folding constants from two similar selects that feed a add
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define float @test1(i1 zeroext %arg) #0 {
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%tmp = select i1 %arg, float 5.000000e+00, float 6.000000e+00
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%tmp1 = select i1 %arg, float 1.000000e+00, float 9.000000e+00
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%tmp2 = fadd float %tmp, %tmp1
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ret float %tmp2
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; CHECK-LABEL: @test1(
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; CHECK: %tmp2 = select i1 %arg, float 6.000000e+00, float 1.500000e+01
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; CHECK-NOT: fadd
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; CHECK: ret float %tmp2
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}
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; Tests folding constants from two similar selects that feed a sub
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define float @test2(i1 zeroext %arg) #0 {
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%tmp = select i1 %arg, float 5.000000e+00, float 6.000000e+00
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%tmp1 = select i1 %arg, float 1.000000e+00, float 9.000000e+00
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%tmp2 = fsub float %tmp, %tmp1
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ret float %tmp2
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; CHECK-LABEL: @test2(
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; CHECK: %tmp2 = select i1 %arg, float 4.000000e+00, float -3.000000e+00
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; CHECK-NOT: fsub
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; CHECK: ret float %tmp2
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}
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; Tests folding constants from two similar selects that feed a mul
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define float @test3(i1 zeroext %arg) #0 {
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%tmp = select i1 %arg, float 5.000000e+00, float 6.000000e+00
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%tmp1 = select i1 %arg, float 1.000000e+00, float 9.000000e+00
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%tmp2 = fmul float %tmp, %tmp1
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ret float %tmp2
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; CHECK-LABEL: @test3(
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; CHECK: %tmp2 = select i1 %arg, float 5.000000e+00, float 5.400000e+01
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; CHECK-NOT: fmul
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; CHECK: ret float %tmp2
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}
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