mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-20 11:29:24 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16527 91177308-0d34-0410-b5e6-96231b3b80d8
145 lines
2.7 KiB
LLVM
145 lines
2.7 KiB
LLVM
; This test makes sure that these instructions are properly eliminated.
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;
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; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep and
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implementation
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int %test1(int %A) {
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%B = and int %A, 0 ; zero result
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ret int %B
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}
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int %test2(int %A) {
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%B = and int %A, -1 ; noop
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ret int %B
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}
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bool %test3(bool %A) {
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%B = and bool %A, false ; always = false
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ret bool %B
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}
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bool %test4(bool %A) {
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%B = and bool %A, true ; noop
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ret bool %B
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}
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int %test5(int %A) {
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%B = and int %A, %A
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ret int %B
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}
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bool %test6(bool %A) {
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%B = and bool %A, %A
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ret bool %B
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}
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int %test7(int %A) { ; A & ~A == 0
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%NotA = xor int %A, -1
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%B = and int %A, %NotA
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ret int %B
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}
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ubyte %test8(ubyte %A) { ; AND associates
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%B = and ubyte %A, 3
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%C = and ubyte %B, 4
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ret ubyte %C
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}
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bool %test9(int %A) {
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%B = and int %A, -2147483648 ; Test of sign bit, convert to setle %A, 0
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%C = setne int %B, 0
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ret bool %C
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}
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bool %test9(uint %A) {
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%B = and uint %A, 2147483648 ; Test of sign bit, convert to setle %A, 0
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%C = setne uint %B, 0
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ret bool %C
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}
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uint %test10(uint %A) {
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%B = and uint %A, 12
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%C = xor uint %B, 15
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%D = and uint %C, 1 ; (X ^ C1) & C2 --> (X & C2) ^ (C1&C2)
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ret uint %D
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}
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uint %test11(uint %A, uint* %P) {
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%B = or uint %A, 3
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%C = xor uint %B, 12
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store uint %C, uint* %P ; additional use of C
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%D = and uint %C, 3 ; %C = and uint %B, 3 --> 3
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ret uint %D
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}
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bool %test12(uint %A, uint %B) {
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%C1 = setlt uint %A, %B
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%C2 = setle uint %A, %B
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%D = and bool %C1, %C2 ; (A < B) & (A <= B) === (A < B)
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ret bool %D
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}
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bool %test13(uint %A, uint %B) {
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%C1 = setlt uint %A, %B
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%C2 = setgt uint %A, %B
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%D = and bool %C1, %C2 ; (A < B) & (A > B) === false
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ret bool %D
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}
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bool %test14(ubyte %A) {
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%B = and ubyte %A, 128
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%C = setne ubyte %B, 0
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ret bool %C
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}
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ubyte %test15(ubyte %A) {
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%B = shr ubyte %A, ubyte 7
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%C = and ubyte %B, 2 ; Always equals zero
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ret ubyte %C
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}
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ubyte %test16(ubyte %A) {
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%B = shl ubyte %A, ubyte 2
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%C = and ubyte %B, 3
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ret ubyte %C
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}
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sbyte %test17(sbyte %X, sbyte %Y) { ;; ~(~X & Y) --> (X | ~Y)
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%B = xor sbyte %X, -1
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%C = and sbyte %B, %Y
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%D = xor sbyte %C, -1
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ret sbyte %D
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}
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bool %test18(int %A) {
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%B = and int %A, -128
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%C = setne int %B, 0 ;; C >= 128
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ret bool %C
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}
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bool %test18a(ubyte %A) {
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%B = and ubyte %A, 254
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%C = seteq ubyte %B, 0
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ret bool %C
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}
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int %test19(int %A) {
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%B = shl int %A, ubyte 3
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%C = and int %B, -2 ;; Clearing a zero bit
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ret int %C
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}
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ubyte %test20(ubyte %A) {
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%C = shr ubyte %A, ubyte 7
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%D = and ubyte %C, 1 ;; Unneeded
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ret ubyte %D
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}
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sbyte %test21(sbyte %A) {
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%C = shr sbyte %A, ubyte 7 ;; sign extend
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%D = and sbyte %C, 1 ;; chop off sign
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ret sbyte %D
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}
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