43 lines
1.2 KiB
LLVM
43 lines
1.2 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; (x&z) ^ (y&z) -> (x^y)&z
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define i32 @test1(i32 %x, i32 %y, i32 %z) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: [[T61:%.*]] = xor i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[T7:%.*]] = and i32 [[T61]], [[Z:%.*]]
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; CHECK-NEXT: ret i32 [[T7]]
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;
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%t3 = and i32 %z, %x
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%t6 = and i32 %z, %y
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%t7 = xor i32 %t3, %t6
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ret i32 %t7
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}
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; (x & y) ^ (x|y) -> x^y
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define i32 @test2(i32 %x, i32 %y, i32 %z) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[T7:%.*]] = xor i32 [[Y:%.*]], [[X:%.*]]
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; CHECK-NEXT: ret i32 [[T7]]
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;
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%t3 = and i32 %y, %x
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%t6 = or i32 %y, %x
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%t7 = xor i32 %t3, %t6
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ret i32 %t7
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}
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define i32 @PR38761(i32 %a, i32 %b) {
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; CHECK-LABEL: @PR38761(
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; CHECK-NEXT: [[B_LOBIT_NOT1_DEMORGAN:%.*]] = or i32 [[B:%.*]], [[A:%.*]]
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; CHECK-NEXT: [[B_LOBIT_NOT1:%.*]] = xor i32 [[B_LOBIT_NOT1_DEMORGAN]], -1
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; CHECK-NEXT: [[AND:%.*]] = lshr i32 [[B_LOBIT_NOT1]], 31
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; CHECK-NEXT: ret i32 [[AND]]
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;
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%a.lobit = lshr i32 %a, 31
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%a.lobit.not = xor i32 %a.lobit, 1
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%b.lobit = lshr i32 %b, 31
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%b.lobit.not = xor i32 %b.lobit, 1
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%and = and i32 %b.lobit.not, %a.lobit.not
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ret i32 %and
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}
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