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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7281 91177308-0d34-0410-b5e6-96231b3b80d8
81 lines
1.4 KiB
LLVM
81 lines
1.4 KiB
LLVM
; This test makes sure that these instructions are properly eliminated.
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;
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; RUN: as < %s | opt -instcombine | dis | not grep 'xor '
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implementation
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bool %test0(bool %A) {
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%B = xor bool %A, false
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ret bool %B
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}
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int %test1(int %A) {
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%B = xor int %A, 0
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ret int %B
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}
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bool %test2(bool %A) {
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%B = xor bool %A, %A
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ret bool %B
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}
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int %test3(int %A) {
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%B = xor int %A, %A
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ret int %B
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}
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int %test4(int %A) { ; A ^ ~A == -1
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%NotA = xor int -1, %A
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%B = xor int %A, %NotA
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ret int %B
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}
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uint %test5(uint %A) { ; (A|B)^B == A & (~B)
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%t1 = or uint %A, 123
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%r = xor uint %t1, 123
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ret uint %r
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}
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ubyte %test6(ubyte %A) {
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%B = xor ubyte %A, 17
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%C = xor ubyte %B, 17
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ret ubyte %C
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}
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; (A & C1)^(B & C2) -> (A & C1)|(B & C2) iff C1&C2 == 0
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int %test7(int %A, int %B) {
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%A1 = and int %A, 7
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%B1 = and int %B, 128
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%C1 = xor int %A1, %B1
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ret int %C1
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}
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ubyte %test8(bool %c) {
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%d = xor bool %c, true ; invert the condition
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br bool %d, label %True, label %False
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True:
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ret ubyte 1
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False:
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ret ubyte 3
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}
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bool %test9(ubyte %A) {
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%B = xor ubyte %A, 123 ; xor can be eliminated
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%C = seteq ubyte %B, 34
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ret bool %C
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}
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ubyte %test10(ubyte %A) {
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%B = and ubyte %A, 3
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%C = xor ubyte %B, 4 ; transform into an OR
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ret ubyte %C
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}
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ubyte %test11(ubyte %A) {
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%B = or ubyte %A, 12
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%C = xor ubyte %B, 4 ; transform into an AND
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ret ubyte %C
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}
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