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37 lines
812 B
LLVM
37 lines
812 B
LLVM
; This test makes sure that or instructions are properly eliminated.
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; This test is for Integer BitWidth <= 64 && BitWidth % 2 != 0.
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;
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; RUN: opt < %s -instcombine -S | not grep or
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define i7 @test0(i7 %X) {
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%Y = or i7 %X, 0
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ret i7 %Y
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}
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define i17 @test1(i17 %X) {
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%Y = or i17 %X, -1
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ret i17 %Y
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}
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define i23 @test2(i23 %A) {
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;; A | ~A == -1
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%NotA = xor i23 -1, %A
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%B = or i23 %A, %NotA
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ret i23 %B
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}
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define i39 @test3(i39 %V, i39 %M) {
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;; If we have: ((V + N) & C1) | (V & C2)
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;; .. and C2 = ~C1 and C2 is 0+1+ and (N & C2) == 0
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;; replace with V+N.
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%C1 = xor i39 274877906943, -1 ;; C2 = 274877906943
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%N = and i39 %M, 274877906944
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%A = add i39 %V, %N
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%B = and i39 %A, %C1
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%D = and i39 %V, 274877906943
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%R = or i39 %B, %D
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ret i39 %R
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}
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