forked from OSchip/llvm-project
69 lines
1.5 KiB
LLVM
69 lines
1.5 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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define i32 @factorize(i32 %x, i32 %y) {
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; CHECK-LABEL: @factorize(
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; (X | 1) & (X | 2) -> X | (1 & 2) -> X
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%l = or i32 %x, 1
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%r = or i32 %x, 2
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%z = and i32 %l, %r
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ret i32 %z
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; CHECK: ret i32 %x
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}
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define i32 @factorize2(i32 %x) {
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; CHECK-LABEL: @factorize2(
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; 3*X - 2*X -> X
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%l = mul i32 3, %x
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%r = mul i32 2, %x
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%z = sub i32 %l, %r
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ret i32 %z
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; CHECK: ret i32 %x
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}
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define i32 @factorize3(i32 %x, i32 %a, i32 %b) {
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; CHECK-LABEL: @factorize3(
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; (X | (A|B)) & (X | B) -> X | ((A|B) & B) -> X | B
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%aORb = or i32 %a, %b
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%l = or i32 %x, %aORb
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%r = or i32 %x, %b
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%z = and i32 %l, %r
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ret i32 %z
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; CHECK: %z = or i32 %b, %x
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; CHECK: ret i32 %z
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}
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define i32 @factorize4(i32 %x, i32 %y) {
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; CHECK-LABEL: @factorize4(
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; ((Y << 1) * X) - (X * Y) -> (X * (Y * 2 - Y)) -> (X * Y)
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%sh = shl i32 %y, 1
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%ml = mul i32 %sh, %x
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%mr = mul i32 %x, %y
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%s = sub i32 %ml, %mr
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ret i32 %s
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; CHECK: %s = mul i32 %y, %x
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; CHECK: ret i32 %s
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}
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define i32 @factorize5(i32 %x, i32 %y) {
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; CHECK-LABEL: @factorize5(
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; ((Y * 2) * X) - (X * Y) -> (X * Y)
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%sh = mul i32 %y, 2
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%ml = mul i32 %sh, %x
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%mr = mul i32 %x, %y
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%s = sub i32 %ml, %mr
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ret i32 %s
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; CHECK: %s = mul i32 %y, %x
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; CHECK: ret i32 %s
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}
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define i32 @expand(i32 %x) {
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; CHECK-LABEL: @expand(
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; ((X & 1) | 2) & 1 -> ((X & 1) & 1) | (2 & 1) -> (X & 1) | 0 -> X & 1
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%a = and i32 %x, 1
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%b = or i32 %a, 2
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%c = and i32 %b, 1
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ret i32 %c
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; CHECK: %a = and i32 %x, 1
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; CHECK: ret i32 %a
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}
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