d8b4b06f5d
These changes faciliate positive behavior for arithmetic based select expressions that match its translation criteria, keeping code size gated to neutral or improved scenarios. Patch by Michael Berg <michael_c_berg@apple.com>! Differential Revision: https://reviews.llvm.org/D38263 llvm-svn: 314320
85 lines
3.0 KiB
LLVM
85 lines
3.0 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 @test1a(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: @test1a(
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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 multiple expression constants from similar selects that feed a adds
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define float @test1b(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 = select i1 %arg, float 2.500000e-01, float 4.000000e+00
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%tmp3 = fadd float %tmp, %tmp1
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%tmp4 = fadd float %tmp2, %tmp1
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%tmp5 = fadd float %tmp4, %tmp3
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ret float %tmp5
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; CHECK-LABEL: @test1b(
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; CHECK: %tmp5 = select i1 %arg, float 7.250000e+00, float 2.800000e+01
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; CHECK-NOT: fadd
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; CHECK: ret float %tmp5
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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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declare void @use_float(float)
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; Tests folding constants if the selects have multiple uses but
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; we can fold away the binary op with a select.
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define float @test4(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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call void @use_float(float %tmp)
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ret float %tmp2
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; CHECK-LABEL: @test4(
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; CHECK: select i1 %arg, float 5.000000e+00, float 6.000000e+00
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; CHECK-NEXT: select i1 %arg, float 5.000000e+00, float 5.400000e+01
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; CHECK-NEXT: call void @use_float(float %tmp)
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; CHECK: ret float %tmp2
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}
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; Tests not folding constants if we cannot fold away any of the selects.
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define float @test5(i1 zeroext %arg, float %div) {
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%tmp = select i1 %arg, float %div, float 5.000000e+00
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%mul = fmul contract float %tmp, %tmp
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call void @use_float(float %tmp)
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ret float %mul
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; CHECK-LABEL: @test5(
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; CHECK: [[TMP:%.*]] = select i1 %arg, float %div, float 5.000000e+00
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; CHECK-NEXT: [[MUL:%.*]] = fmul contract float [[TMP]], [[TMP]]
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; CHECK-NOT: fmul contract float %div, %div
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; CHECK: ret float [[MUL]]
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}
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