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; This test makes sure that these instructions are properly eliminated.
;
; RUN: if as < %s | opt -instcombine -die | dis | grep sub | grep -v 'sub int %Cok, %Bok'
; RUN: then exit 1
; RUN: else exit 0
; RUN: fi
implementation
int %test1(int %A) {
%B = sub int %A, %A ; ISA constant 0
ret int %B
}
int %test2(int %A) {
%B = sub int %A, 0
ret int %B
}
int %test3(int %A) {
%B = sub int 0, %A ; B = -A
%C = sub int 0, %B ; C = -B = A
ret int %C
}
int %test4(int %A, int %x) {
%B = sub int 0, %A
%C = sub int %x, %B
ret int %C
}
int %test5(int %A, int %Bok, int %Cok) {
%D = sub int %Bok, %Cok
%E = sub int %A, %D
ret int %E
}
int %test6(int %A, int %B) {
%C = and int %A, %B ; A - (A & B) => A & ~B
%D = sub int %A, %C
ret int %D
}
int %test7(int %A) {
%B = sub int -1, %A ; B = ~A
ret int %B
}
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