| ; This test makes sure that these instructions are properly eliminated. |
| ; |
| |
| ; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep and |
| |
| implementation |
| |
| int %test1(int %A) { |
| %B = and int %A, 0 ; zero result |
| ret int %B |
| } |
| |
| int %test2(int %A) { |
| %B = and int %A, -1 ; noop |
| ret int %B |
| } |
| |
| bool %test3(bool %A) { |
| %B = and bool %A, false ; always = false |
| ret bool %B |
| } |
| |
| bool %test4(bool %A) { |
| %B = and bool %A, true ; noop |
| ret bool %B |
| } |
| |
| int %test5(int %A) { |
| %B = and int %A, %A |
| ret int %B |
| } |
| |
| bool %test6(bool %A) { |
| %B = and bool %A, %A |
| ret bool %B |
| } |
| |
| int %test7(int %A) { ; A & ~A == 0 |
| %NotA = xor int %A, -1 |
| %B = and int %A, %NotA |
| ret int %B |
| } |
| |
| ubyte %test8(ubyte %A) { ; AND associates |
| %B = and ubyte %A, 3 |
| %C = and ubyte %B, 4 |
| ret ubyte %C |
| } |
| |
| bool %test9(int %A) { |
| %B = and int %A, -2147483648 ; Test of sign bit, convert to setle %A, 0 |
| %C = setne int %B, 0 |
| ret bool %C |
| } |
| |
| bool %test9(uint %A) { |
| %B = and uint %A, 2147483648 ; Test of sign bit, convert to setle %A, 0 |
| %C = setne uint %B, 0 |
| ret bool %C |
| } |
| |
| uint %test10(uint %A) { |
| %B = and uint %A, 12 |
| %C = xor uint %B, 15 |
| %D = and uint %C, 1 ; (X ^ C1) & C2 --> (X & C2) ^ (C1&C2) |
| ret uint %D |
| } |
| |
| uint %test11(uint %A, uint* %P) { |
| %B = or uint %A, 3 |
| %C = xor uint %B, 12 |
| store uint %C, uint* %P ; additional use of C |
| %D = and uint %C, 3 ; %C = and uint %B, 3 --> 3 |
| ret uint %D |
| } |
| |
| bool %test12(uint %A, uint %B) { |
| %C1 = setlt uint %A, %B |
| %C2 = setle uint %A, %B |
| %D = and bool %C1, %C2 ; (A < B) & (A <= B) === (A < B) |
| ret bool %D |
| } |
| |
| bool %test13(uint %A, uint %B) { |
| %C1 = setlt uint %A, %B |
| %C2 = setgt uint %A, %B |
| %D = and bool %C1, %C2 ; (A < B) & (A > B) === false |
| ret bool %D |
| } |
| |
| bool %test14(ubyte %A) { |
| %B = and ubyte %A, 128 |
| %C = setne ubyte %B, 0 |
| ret bool %C |
| } |
| |
| ubyte %test15(ubyte %A) { |
| %B = shr ubyte %A, ubyte 7 |
| %C = and ubyte %B, 2 ; Always equals zero |
| ret ubyte %C |
| } |
| |
| ubyte %test16(ubyte %A) { |
| %B = shl ubyte %A, ubyte 2 |
| %C = and ubyte %B, 3 |
| ret ubyte %C |
| } |