llvm-mirror/test/Regression/Transforms/InstCombine/shift.ll

; This test makes sure that these instructions are properly eliminated.
;

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

implementation

int %test1(int %A) {
	%B = shl int %A, ubyte 0
	ret int %B
}

int %test2(ubyte %A) {
	%B = shl int 0, ubyte %A
	ret int %B
}

int %test3(int %A) {
	%B = shr int %A, ubyte 0
	ret int %B
}

int %test4(ubyte %A) {
	%B = shr int 0, ubyte %A
	ret int %B
}

uint %test5(uint %A) {
	%B = shr uint %A, ubyte 32  ;; shift all bits out
	ret uint %B
}

uint %test6(uint %A) {
	%B = shl uint %A, ubyte 1   ;; convert to an add instruction
	ret uint %B
}

int %test7(ubyte %A) {
	%B = shr int -1, ubyte %A   ;; Always equal to -1
	ret int %B
}