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c4d2690b90
select Cond, C +/- 1, C --> add(ext Cond), C -- with a target hook. This is part of the ongoing process to obsolete D24480. The motivation is to canonicalize to select IR in InstCombine whenever possible, so we need to have a way to undo that easily in codegen. PowerPC is an obvious winner for this kind of transform because it has fast and complete bit-twiddling abilities but generally lousy conditional execution perf (although this might have changed in recent implementations). x86 also sees some wins, but the effect is limited because these transforms already mostly exist in its target-specific combineSelectOfTwoConstants(). The fact that we see any x86 changes just shows that that code is a mess of special-case holes. We may be able to remove some of that logic now. My guess is that other targets will want to enable this hook for most cases. The likely follow-ups would be to add value type and/or the constants themselves as parameters for the hook. As the tests in select_const.ll show, we can transform any select-of-constants to math/logic, but the general transform for any 2 constants needs one more instruction (multiply or 'and'). ARM is one target that I think may not want this for most cases. I see infinite loops there because it wants to use selects to enable conditionally executed instructions. Differential Revision: https://reviews.llvm.org/D30537 llvm-svn: 296977
200 lines
5.2 KiB
LLVM
200 lines
5.2 KiB
LLVM
; RUN: llc -verify-machineinstrs -mcpu=pwr7 < %s | FileCheck %s
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; RUN: llc -verify-machineinstrs -mcpu=pwr7 -ppc-gen-isel=false < %s | FileCheck --check-prefix=CHECK-NO-ISEL %s
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target datalayout = "E-m:e-i64:64-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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; Function Attrs: nounwind readnone
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define zeroext i1 @test1(float %v1, float %v2) #0 {
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entry:
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%cmp = fcmp oge float %v1, %v2
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%cmp2 = fcmp ole float %v2, 0.000000e+00
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%and5 = and i1 %cmp, %cmp2
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ret i1 %and5
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; CHECK-LABEL: @test1
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; CHECK-DAG: fcmpu {{[0-9]+}}, 1, 2
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; CHECK-DAG: li [[REG1:[0-9]+]], 1
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; CHECK-DAG: xxlxor [[REG2:[0-9]+]], [[REG2]], [[REG2]]
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; CHECK-DAG: fcmpu {{[0-9]+}}, 2, [[REG2]]
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; CHECK: crnor
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; CHECK: crnor
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; CHECK: crnand [[REG4:[0-9]+]],
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; CHECK: isel 3, 0, [[REG1]], [[REG4]]
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; CHECK-NO-ISEL-LABEL: @test1
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; CHECK-NO-ISEL: bc 12, 20, [[TRUE:.LBB[0-9]+]]
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; CHECK-NO-ISEL-NEXT: blr
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; CHECK-NO-ISEL-NEXT: [[TRUE]]
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; CHECK-NO-ISEL-NEXT: addi 3, 0, 0
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; CHECK-NO-ISEL-NEXT: blr
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; CHECK: blr
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}
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; Function Attrs: nounwind readnone
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define zeroext i1 @test2(float %v1, float %v2) #0 {
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entry:
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%cmp = fcmp oge float %v1, %v2
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%cmp2 = fcmp ole float %v2, 0.000000e+00
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%xor5 = xor i1 %cmp, %cmp2
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ret i1 %xor5
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; CHECK-LABEL: @test2
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; CHECK-DAG: fcmpu {{[0-9]+}}, 1, 2
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; CHECK-DAG: li [[REG1:[0-9]+]], 1
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; CHECK-DAG: xxlxor [[REG2:[0-9]+]], [[REG2]], [[REG2]]
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; CHECK-DAG: fcmpu {{[0-9]+}}, 2, [[REG2]]
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; CHECK: crnor
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; CHECK: crnor
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; CHECK: creqv [[REG4:[0-9]+]],
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; CHECK: isel 3, 0, [[REG1]], [[REG4]]
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; CHECK: blr
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}
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; Function Attrs: nounwind readnone
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define zeroext i1 @test3(float %v1, float %v2, i32 signext %x) #0 {
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entry:
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%cmp = fcmp oge float %v1, %v2
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%cmp2 = fcmp ole float %v2, 0.000000e+00
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%cmp4 = icmp ne i32 %x, -2
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%and7 = and i1 %cmp2, %cmp4
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%xor8 = xor i1 %cmp, %and7
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ret i1 %xor8
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; CHECK-LABEL: @test3
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; CHECK-DAG: fcmpu {{[0-9]+}}, 1, 2
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; CHECK-DAG: li [[REG1:[0-9]+]], 1
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; CHECK-DAG: xxlxor [[REG2:[0-9]+]], [[REG2]], [[REG2]]
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; CHECK-DAG: fcmpu {{[0-9]+}}, 2, [[REG2]]
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; CHECK: crnor
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; CHECK: crnor
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; CHECK: crandc
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; CHECK: creqv [[REG4:[0-9]+]],
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; CHECK: isel 3, 0, [[REG1]], [[REG4]]
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; CHECK: blr
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}
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; Function Attrs: nounwind readnone
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define zeroext i1 @test4(i1 zeroext %v1, i1 zeroext %v2, i1 zeroext %v3) #0 {
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entry:
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%and8 = and i1 %v1, %v2
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%or9 = or i1 %and8, %v3
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ret i1 %or9
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; CHECK-DAG: @test4
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; CHECK: and [[REG1:[0-9]+]], 3, 4
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; CHECK: or 3, [[REG1]], 5
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; CHECK: blr
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}
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; Function Attrs: nounwind readnone
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define zeroext i1 @test5(i1 zeroext %v1, i1 zeroext %v2, i32 signext %v3) #0 {
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entry:
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%and6 = and i1 %v1, %v2
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%cmp = icmp ne i32 %v3, -2
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%or7 = or i1 %and6, %cmp
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ret i1 %or7
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; CHECK-LABEL: @test5
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; CHECK-DAG: and [[REG1:[0-9]+]], 3, 4
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; CHECK-DAG: cmpwi {{[0-9]+}}, 5, -2
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; CHECK-DAG: li [[REG3:[0-9]+]], 1
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; CHECK-DAG: andi. {{[0-9]+}}, [[REG1]], 1
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; CHECK-DAG: crandc [[REG5:[0-9]+]],
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; CHECK: isel 3, 0, [[REG3]], [[REG5]]
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; CHECK: blr
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}
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; Function Attrs: nounwind readnone
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define zeroext i1 @test6(i1 zeroext %v1, i1 zeroext %v2, i32 signext %v3) #0 {
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entry:
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%cmp = icmp ne i32 %v3, -2
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%or6 = or i1 %cmp, %v2
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%and7 = and i1 %or6, %v1
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ret i1 %and7
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; CHECK-LABEL: @test6
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; CHECK-DAG: andi. {{[0-9]+}}, 3, 1
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; CHECK-DAG: cmpwi {{[0-9]+}}, 5, -2
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; CHECK-DAG: crmove [[REG1:[0-9]+]], 1
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; CHECK-DAG: andi. {{[0-9]+}}, 4, 1
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; CHECK-DAG: li [[REG2:[0-9]+]], 1
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; CHECK-DAG: crorc [[REG4:[0-9]+]], 1,
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; CHECK-DAG: crnand [[REG5:[0-9]+]], [[REG4]], [[REG1]]
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; CHECK: isel 3, 0, [[REG2]], [[REG5]]
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; CHECK: blr
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}
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; Function Attrs: nounwind readnone
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define signext i32 @test7(i1 zeroext %v2, i32 signext %i1, i32 signext %i2) #0 {
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entry:
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%cond = select i1 %v2, i32 %i1, i32 %i2
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ret i32 %cond
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; CHECK-LABEL: @test7
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; CHECK: andi. {{[0-9]+}}, 3, 1
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; CHECK: isel 3, 4, 5, 1
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; CHECK: blr
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}
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define signext i32 @exttest7(i32 signext %a) #0 {
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entry:
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%cmp = icmp eq i32 %a, 5
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%cond = select i1 %cmp, i32 7, i32 8
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ret i32 %cond
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; CHECK-LABEL: @exttest7
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; CHECK-DAG: cmpwi {{[0-9]+}}, 3, 5
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; CHECK-DAG: li [[REG1:[0-9]+]], 8
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; CHECK-DAG: li [[REG2:[0-9]+]], 7
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; CHECK: isel 3, [[REG2]], [[REG1]],
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; CHECK-NOT: rldicl
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; CHECK: blr
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}
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define zeroext i32 @exttest8() #0 {
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entry:
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%v0 = load i64, i64* undef, align 8
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%sub = sub i64 80, %v0
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%div = lshr i64 %sub, 1
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%conv13 = trunc i64 %div to i32
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%cmp14 = icmp ugt i32 %conv13, 80
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%.conv13 = select i1 %cmp14, i32 0, i32 %conv13
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ret i32 %.conv13
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; CHECK-LABEL: @exttest8
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; This is a don't-crash test: %conv13 is both one of the possible select output
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; values and also an input to the conditional feeding it.
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}
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; Function Attrs: nounwind readnone
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define float @test8(i1 zeroext %v2, float %v1, float %v3) #0 {
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entry:
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%cond = select i1 %v2, float %v1, float %v3
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ret float %cond
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; CHECK-LABEL: @test8
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; CHECK: andi. {{[0-9]+}}, 3, 1
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; CHECK: bclr 12, 1, 0
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; CHECK: fmr 1, 2
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; CHECK: blr
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}
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; Function Attrs: nounwind readnone
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define signext i32 @test10(i32 signext %v1, i32 signext %v2) #0 {
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entry:
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%tobool = icmp ne i32 %v1, 0
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%lnot = icmp eq i32 %v2, 0
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%and3 = and i1 %tobool, %lnot
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%and = zext i1 %and3 to i32
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ret i32 %and
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; CHECK-LABEL: @test10
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; CHECK-DAG: cmpwi {{[0-9]+}}, 3, 0
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; CHECK-DAG: cmpwi {{[0-9]+}}, 4, 0
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; CHECK-DAG: li [[REG2:[0-9]+]], 1
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; CHECK-DAG: crorc [[REG3:[0-9]+]],
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; CHECK: isel 3, 0, [[REG2]], [[REG3]]
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; CHECK: blr
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}
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attributes #0 = { nounwind readnone }
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