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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9675 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-11-03 05:42:50 +00:00
parent 4d3ba7397f
commit 5fecdecda4
1 changed files with 29 additions and 0 deletions
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29
test/Transforms/InstCombine/bit-tracking.ll
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@ -16,3 +16,32 @@ bool %test1(int %A, int %B) {
ret bool %ELIM3
}
; See if we can eliminate the shifts...
int %test2(int %B) {
%ELIM1 = shl int %B, ubyte 31
%ELIM2 = shr int %ELIM1, ubyte 31
%inc = add int %ELIM2, 1 ; == xor int %B, 1
ret int %inc
}
; Reduce down to a single XOR
int %test3(int %B) {
%ELIMinc = and int %B, 1
%tmp.5 = xor int %ELIMinc, 1
%ELIM7 = and int %B, -2
%tmp.8 = or int %tmp.5, %ELIM7
ret int %tmp.8
}
; Finally, a bigger case where we chain things together. This corresponds to
; incrementing a single-bit bitfield, which should become just an xor.
int %test4(int %B) {
%ELIM3 = shl int %B, ubyte 31
%ELIM4 = shr int %ELIM3, ubyte 31
%inc = add int %ELIM4, 1
%ELIM5 = and int %inc, 1
%ELIM7 = and int %B, -2
%tmp.8 = or int %ELIM5, %ELIM7
ret int %tmp.8
}