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https://github.com/c64scene-ar/llvm-6502.git
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5d787bb93e
types. These tests mimic the integer test cases in the normal InstCombine test suite but use "strange" integer bit widths. Most tests written by Zhou Sheng, a few by me. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35284 91177308-0d34-0410-b5e6-96231b3b80d8
53 lines
1.2 KiB
LLVM
53 lines
1.2 KiB
LLVM
; This test makes sure that xor instructions are properly eliminated.
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; This test is for Integer BitWidth <= 64 && BitWidth % 8 != 0.
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; RUN: llvm-as < %s | opt -instcombine -disable-output &&
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; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep 'xor '
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implementation
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define i47 @test1(i47 %A, i47 %B) {
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;; (A & C1)^(B & C2) -> (A & C1)|(B & C2) iff C1&C2 == 0
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%A1 = and i47 %A, 70368744177664
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%B1 = and i47 %B, 70368744177663
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%C1 = xor i47 %A1, %B1
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ret i47 %C1
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}
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define i15 @test2(i15 %x) {
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%tmp.2 = xor i15 %x, 0
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ret i15 %tmp.2
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}
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define i23 @test3(i23 %x) {
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%tmp.2 = xor i23 %x, %x
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ret i23 %tmp.2
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}
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define i37 @test4(i37 %x) {
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; x ^ ~x == -1
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%NotX = xor i37 -1, %x
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%B = xor i37 %x, %NotX
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ret i37 %B
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}
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define i7 @test5(i7 %A) {
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;; (A|B)^B == A & (~B)
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%t1 = or i7 %A, 23
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%r = xor i7 %t1, 23
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ret i7 %r
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}
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define i7 @test6(i7 %A) {
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%t1 = xor i7 %A, 23
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%r = xor i7 %t1, 23
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ret i7 %r
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}
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define i47 @test7(i47 %A) {
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;; (A | C1) ^ C2 -> (A | C1) & ~C2 iff (C1&C2) == C2
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%B1 = or i47 %A, 70368744177663
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%C1 = xor i47 %B1, 703687463
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ret i47 %C1
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}
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