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8408add00a
- (A & C1)+(B & C2) -> (A & C1)|(B & C2) iff C1&C2 == 0 - (A & C1)^(B & C2) -> (A & C1)|(B & C2) iff C1&C2 == 0 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5741 91177308-0d34-0410-b5e6-96231b3b80d8
53 lines
839 B
LLVM
53 lines
839 B
LLVM
; This test makes sure that these instructions are properly eliminated.
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;
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; RUN: if as < %s | opt -instcombine | dis | grep and
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; RUN: then exit 1
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; RUN: else exit 0
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; RUN: fi
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implementation
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int %test1(int %A) {
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%B = and int %A, 0 ; zero result
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ret int %B
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}
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int %test2(int %A) {
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%B = and int %A, -1 ; noop
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ret int %B
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}
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bool %test3(bool %A) {
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%B = and bool %A, false ; always = false
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ret bool %B
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}
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bool %test4(bool %A) {
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%B = and bool %A, true ; noop
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ret bool %B
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}
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int %test5(int %A) {
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%B = and int %A, %A
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ret int %B
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}
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bool %test6(bool %A) {
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%B = and bool %A, %A
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ret bool %B
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}
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int %test7(int %A) { ; A & ~A == 0
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%NotA = xor int %A, -1
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%B = and int %A, %NotA
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ret int %B
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}
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ubyte %test8(ubyte %A) { ; AND associates
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%B = and ubyte %A, 3
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%C = and ubyte %B, 4
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ret ubyte %C
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}
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