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			75 lines
		
	
	
		
			1.3 KiB
		
	
	
	
		
			LLVM
		
	
	
	
	
	
			
		
		
	
	
			75 lines
		
	
	
		
			1.3 KiB
		
	
	
	
		
			LLVM
		
	
	
	
	
	
| ; This test makes sure that mul instructions are properly eliminated.
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| ;
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| 
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| ; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep mul
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| 
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| implementation
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| 
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| int %test1(int %A) {
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| 	%B = mul int %A, 1
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| 	ret int %B
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| }
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| 
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| int %test2(int %A) {
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| 	%B = mul int %A, 2   ; Should convert to an add instruction
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| 	ret int %B
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| }
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| 
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| int %test3(int %A) {
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| 	%B = mul int %A, 0   ; This should disappear entirely
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| 	ret int %B
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| }
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| 
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| double %test4(double %A) {
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| 	%B = mul double 1.0, %A   ; This is safe for FP
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| 	ret double %B
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| }
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| 
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| int %test5(int %A) {
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| 	%B = mul int %A, 8
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| 	ret int %B
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| }
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| 
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| ubyte %test6(ubyte %A) {
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| 	%B = mul ubyte %A, 8
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| 	%C = mul ubyte %B, 8
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| 	ret ubyte %C
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| }
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| 
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| int %test7(int %i) {
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|         %tmp = mul int %i, -1   ; %tmp = sub 0, %i
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|         ret int %tmp
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| }
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| 
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| ulong %test8(ulong %i) {
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| 	%j = mul ulong %i, 18446744073709551615 ; tmp = sub 0, %i
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| 	ret ulong %j
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| }
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| 
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| uint %test9(uint %i) {
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| 	%j = mul uint %i, 4294967295    ; %j = sub 0, %i
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| 	ret uint %j
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| }
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| 
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| uint %test10(int %a, uint %b) {
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| 	%c = setlt int %a, 0
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| 	%d = cast bool %c to uint
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| 	%e = mul uint %d, %b           ; e = b & (a >> 31)
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| 	ret uint %e
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| }
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| 
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| uint %test11(int %a, uint %b) {
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| 	%c = setle int %a, -1
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| 	%d = cast bool %c to uint
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| 	%e = mul uint %d, %b           ; e = b & (a >> 31)
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| 	ret uint %e
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| }
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| 
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| uint %test11(ubyte %a, uint %b) {
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| 	%c = setgt ubyte %a, 127
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| 	%d = cast bool %c to uint
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| 	%e = mul uint %d, %b           ; e = b & (a >> 31)
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| 	ret uint %e
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| }
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| 
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