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69ccadd753
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32115 91177308-0d34-0410-b5e6-96231b3b80d8
27 lines
933 B
LLVM
27 lines
933 B
LLVM
; This file contains various testcases that require tracking whether bits are
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; set or cleared by various instructions.
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; RUN: llvm-upgrade < %s | llvm-as | opt -instcombine -instcombine -disable-output &&
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; RUN: llvm-upgrade < %s | llvm-as | opt -instcombine -instcombine | llvm-dis | not grep %ELIM
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; Reduce down to a single XOR
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int %test3(int %B) {
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%ELIMinc = and int %B, 1
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%tmp.5 = xor int %ELIMinc, 1
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%ELIM7 = and int %B, -2
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%tmp.8 = or int %tmp.5, %ELIM7
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ret int %tmp.8
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}
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; Finally, a bigger case where we chain things together. This corresponds to
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; incrementing a single-bit bitfield, which should become just an xor.
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int %test4(int %B) {
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%ELIM3 = shl int %B, ubyte 31
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%ELIM4 = shr int %ELIM3, ubyte 31
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%inc = add int %ELIM4, 1
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%ELIM5 = and int %inc, 1
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%ELIM7 = and int %B, -2
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%tmp.8 = or int %ELIM5, %ELIM7
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ret int %tmp.8
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}
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