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|
; This test makes sure that these instructions are properly eliminated.
;
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | \
; RUN: grep -v xor | not grep {or }
; END.
define i32 @test1(i32 %A) {
%B = or i32 %A, 0 ; <i32> [#uses=1]
ret i32 %B
}
define i32 @test2(i32 %A) {
%B = or i32 %A, -1 ; <i32> [#uses=1]
ret i32 %B
}
define i8 @test2a(i8 %A) {
%B = or i8 %A, -1 ; <i8> [#uses=1]
ret i8 %B
}
define i1 @test3(i1 %A) {
%B = or i1 %A, false ; <i1> [#uses=1]
ret i1 %B
}
define i1 @test4(i1 %A) {
%B = or i1 %A, true ; <i1> [#uses=1]
ret i1 %B
}
define i1 @test5(i1 %A) {
%B = or i1 %A, %A ; <i1> [#uses=1]
ret i1 %B
}
define i32 @test6(i32 %A) {
%B = or i32 %A, %A ; <i32> [#uses=1]
ret i32 %B
}
; A | ~A == -1
define i32 @test7(i32 %A) {
%NotA = xor i32 -1, %A ; <i32> [#uses=1]
%B = or i32 %A, %NotA ; <i32> [#uses=1]
ret i32 %B
}
define i8 @test8(i8 %A) {
%B = or i8 %A, -2 ; <i8> [#uses=1]
%C = or i8 %B, 1 ; <i8> [#uses=1]
ret i8 %C
}
; Test that (A|c1)|(B|c2) == (A|B)|(c1|c2)
define i8 @test9(i8 %A, i8 %B) {
%C = or i8 %A, 1 ; <i8> [#uses=1]
%D = or i8 %B, -2 ; <i8> [#uses=1]
%E = or i8 %C, %D ; <i8> [#uses=1]
ret i8 %E
}
define i8 @test10(i8 %A) {
%B = or i8 %A, 1 ; <i8> [#uses=1]
%C = and i8 %B, -2 ; <i8> [#uses=1]
; (X & C1) | C2 --> (X | C2) & (C1|C2)
%D = or i8 %C, -2 ; <i8> [#uses=1]
ret i8 %D
}
define i8 @test11(i8 %A) {
%B = or i8 %A, -2 ; <i8> [#uses=1]
%C = xor i8 %B, 13 ; <i8> [#uses=1]
; (X ^ C1) | C2 --> (X | C2) ^ (C1&~C2)
%D = or i8 %C, 1 ; <i8> [#uses=1]
%E = xor i8 %D, 12 ; <i8> [#uses=1]
ret i8 %E
}
define i32 @test12(i32 %A) {
; Should be eliminated
%B = or i32 %A, 4 ; <i32> [#uses=1]
%C = and i32 %B, 8 ; <i32> [#uses=1]
ret i32 %C
}
define i32 @test13(i32 %A) {
%B = or i32 %A, 12 ; <i32> [#uses=1]
; Always equal to 8
%C = and i32 %B, 8 ; <i32> [#uses=1]
ret i32 %C
}
define i1 @test14(i32 %A, i32 %B) {
%C1 = icmp ult i32 %A, %B ; <i1> [#uses=1]
%C2 = icmp ugt i32 %A, %B ; <i1> [#uses=1]
; (A < B) | (A > B) === A != B
%D = or i1 %C1, %C2 ; <i1> [#uses=1]
ret i1 %D
}
define i1 @test15(i32 %A, i32 %B) {
%C1 = icmp ult i32 %A, %B ; <i1> [#uses=1]
%C2 = icmp eq i32 %A, %B ; <i1> [#uses=1]
; (A < B) | (A == B) === A <= B
%D = or i1 %C1, %C2 ; <i1> [#uses=1]
ret i1 %D
}
define i32 @test16(i32 %A) {
%B = and i32 %A, 1 ; <i32> [#uses=1]
; -2 = ~1
%C = and i32 %A, -2 ; <i32> [#uses=1]
; %D = and int %B, -1 == %B
%D = or i32 %B, %C ; <i32> [#uses=1]
ret i32 %D
}
define i32 @test17(i32 %A) {
%B = and i32 %A, 1 ; <i32> [#uses=1]
%C = and i32 %A, 4 ; <i32> [#uses=1]
; %D = and int %B, 5
%D = or i32 %B, %C ; <i32> [#uses=1]
ret i32 %D
}
define i1 @test18(i32 %A) {
%B = icmp sge i32 %A, 100 ; <i1> [#uses=1]
%C = icmp slt i32 %A, 50 ; <i1> [#uses=1]
;; (A-50) >u 50
%D = or i1 %B, %C ; <i1> [#uses=1]
ret i1 %D
}
define i1 @test19(i32 %A) {
%B = icmp eq i32 %A, 50 ; <i1> [#uses=1]
%C = icmp eq i32 %A, 51 ; <i1> [#uses=1]
;; (A-50) < 2
%D = or i1 %B, %C ; <i1> [#uses=1]
ret i1 %D
}
define i32 @test20(i32 %x) {
%y = and i32 %x, 123 ; <i32> [#uses=1]
%z = or i32 %y, %x ; <i32> [#uses=1]
ret i32 %z
}
define i32 @test21(i32 %tmp.1) {
%tmp.1.mask1 = add i32 %tmp.1, 2 ; <i32> [#uses=1]
%tmp.3 = and i32 %tmp.1.mask1, -2 ; <i32> [#uses=1]
%tmp.5 = and i32 %tmp.1, 1 ; <i32> [#uses=1]
;; add tmp.1, 2
%tmp.6 = or i32 %tmp.5, %tmp.3 ; <i32> [#uses=1]
ret i32 %tmp.6
}
define i32 @test22(i32 %B) {
%ELIM41 = and i32 %B, 1 ; <i32> [#uses=1]
%ELIM7 = and i32 %B, -2 ; <i32> [#uses=1]
%ELIM5 = or i32 %ELIM41, %ELIM7 ; <i32> [#uses=1]
ret i32 %ELIM5
}
define i16 @test23(i16 %A) {
%B = lshr i16 %A, 1 ; <i16> [#uses=1]
;; fold or into xor
%C = or i16 %B, -32768 ; <i16> [#uses=1]
%D = xor i16 %C, 8193 ; <i16> [#uses=1]
ret i16 %D
}
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