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llvm-mirror/test/Transforms/InstCombine/apint-or1.ll
2009-09-08 22:34:10 +00:00

37 lines
812 B
LLVM

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