llvm-6502/test/Transforms/InstCombine/add.ll

; This test makes sure that add instructions are properly eliminated.
;
; This also tests that a subtract with a constant is properly converted
; to a add w/negative constant

; RUN: if as < %s | opt -instcombine -dce | dis | grep add
; RUN: then exit 1
; RUN: else exit 0
; RUN: fi

implementation

int "test1"(int %A)
begin
	%B = add int %A, 0
	ret int %B
end

int "test2"(int %A)
begin
	%B = add int %A, 5
	%C = add int %B, -5
	ret int %C
end

int "test3"(int %A)
begin
	%B = add int %A, 5
	%C = sub int %B, 5   ;; This should get converted to an add
	ret int %C
end

int "test4"(int %A, int %B) {
        %C = sub int 0, %A
        %D = add int %B, %C      ; D = B + -A = B - A
        ret int %D
}

int "test5"(int %A, int %B) {
        %C = sub int 0, %A
        %D = add int %C, %B      ; D = -A + B = B - A
        ret int %D
}