mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13739 91177308-0d34-0410-b5e6-96231b3b80d8
118 lines
2.4 KiB
LLVM
118 lines
2.4 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 sh
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implementation
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int %test1(int %A) {
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%B = shl int %A, ubyte 0
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ret int %B
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}
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int %test2(ubyte %A) {
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%B = shl int 0, ubyte %A
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ret int %B
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}
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int %test3(int %A) {
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%B = shr int %A, ubyte 0
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ret int %B
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}
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int %test4(ubyte %A) {
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%B = shr int 0, ubyte %A
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ret int %B
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}
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uint %test5(uint %A) {
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%B = shr uint %A, ubyte 32 ;; shift all bits out
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ret uint %B
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}
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uint %test5a(uint %A) {
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%B = shl uint %A, ubyte 32 ;; shift all bits out
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ret uint %B
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}
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uint %test6(uint %A) {
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%B = shl uint %A, ubyte 1 ;; convert to an mul instruction
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%C = mul uint %B, 3
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ret uint %C
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}
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int %test7(ubyte %A) {
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%B = shr int -1, ubyte %A ;; Always equal to -1
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ret int %B
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}
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ubyte %test8(ubyte %A) { ;; (A << 5) << 3 === A << 8 == 0
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%B = shl ubyte %A, ubyte 5
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%C = shl ubyte %B, ubyte 3
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ret ubyte %C
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}
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ubyte %test9(ubyte %A) { ;; (A << 7) >> 7 === A & 1
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%B = shl ubyte %A, ubyte 7
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%C = shr ubyte %B, ubyte 7
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ret ubyte %C
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}
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ubyte %test10(ubyte %A) { ;; (A >> 7) << 7 === A & 128
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%B = shr ubyte %A, ubyte 7
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%C = shl ubyte %B, ubyte 7
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ret ubyte %C
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}
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ubyte %test11(ubyte %A) { ;; (A >> 3) << 4 === (A & 0x1F) << 1
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%a = mul ubyte %A, 3
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%B = shr ubyte %a, ubyte 3
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%C = shl ubyte %B, ubyte 4
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ret ubyte %C
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}
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int %test12(int %A) {
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%B = shr int %A, ubyte 8 ;; (A >> 8) << 8 === A & -256
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%C = shl int %B, ubyte 8
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ret int %C
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}
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sbyte %test13(sbyte %A) { ;; (A >> 3) << 4 === (A & -8) * 2
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%a = mul sbyte %A, 3
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%B = shr sbyte %a, ubyte 3
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%C = shl sbyte %B, ubyte 4
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ret sbyte %C
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}
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uint %test14(uint %A) {
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%B = shr uint %A, ubyte 4
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%C = or uint %B, 1234
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%D = shl uint %C, ubyte 4 ;; D = ((B | 1234) << 4) === ((B << 4)|(1234 << 4)
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ret uint %D
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}
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uint %test14a(uint %A) {
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%B = shl uint %A, ubyte 4
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%C = and uint %B, 1234
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%D = shr uint %C, ubyte 4 ;; D = ((B | 1234) << 4) === ((B << 4)|(1234 << 4)
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ret uint %D
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}
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int %test15(bool %C) {
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%A = select bool %C, int 3, int 1
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%V = shl int %A, ubyte 2
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ret int %V
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}
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int %test15a(bool %C) {
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%A = select bool %C, ubyte 3, ubyte 1
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%V = shl int 64, ubyte %A
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ret int %V
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}
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bool %test16(int %X) {
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%tmp.3 = shr int %X, ubyte 4
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%tmp.6 = and int %tmp.3, 1
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%tmp.7 = setne int %tmp.6, 0 ;; X & 16 != 0
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ret bool %tmp.7
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}
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