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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5730 91177308-0d34-0410-b5e6-96231b3b80d8
75 lines
1.4 KiB
LLVM
75 lines
1.4 KiB
LLVM
; This test makes sure that these instructions are properly eliminated.
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;
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; RUN: if as < %s | opt -instcombine | dis | grep sh
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; RUN: then exit 1
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; RUN: else exit 0
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; RUN: fi
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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 add instruction
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ret uint %B
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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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%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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