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5640f33331
* A & ~A == 0 * A / (2^c) == A >> c if unsigned * 0 / A == 0 * 1.0 * A == A * A * (2^c) == A << c * A ^ ~A == -1 * A | ~A == -1 * 0 % X = 0 * A % (2^c) == A & (c-1) if unsigned * A - (A & B) == A & ~B * -1 - A == ~A git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5588 91177308-0d34-0410-b5e6-96231b3b80d8
50 lines
845 B
LLVM
50 lines
845 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 -die | dis | grep sub | grep -v 'sub int %Cok, %Bok'
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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 = sub int %A, %A ; ISA constant 0
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ret int %B
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}
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int "test2"(int %A) {
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%B = sub int %A, 0
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ret int %B
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}
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int "test3"(int %A) {
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%B = sub int 0, %A ; B = -A
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%C = sub int 0, %B ; C = -B = A
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ret int %C
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}
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int "test4"(int %A, int %x) {
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%B = sub int 0, %A
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%C = sub int %x, %B
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ret int %C
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}
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int "test5"(int %A, int %Bok, int %Cok) {
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%D = sub int %Bok, %Cok
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%E = sub int %A, %D
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ret int %E
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}
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int %test6(int %A, int %B) {
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%C = and int %A, %B ; A - (A & B) => A & ~B
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%D = sub int %A, %C
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ret int %D
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}
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int %test7(int %A) {
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%B = sub int -1, %A ; B = ~A
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ret int %B
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}
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