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popcnt_simple
2018 Jun 02
2
LoopIdiomRecognize is not recognizing the ctpop idiom
Hello.
Could you please tell me why am I not able to recognize (with LLVM built from the SVN
code in Apr 25, 2018) the LLVM IR intrinsic ctpop (described at
https://llvm.org/docs/LangRef.html#llvm-ctpop-intrinsic) in the following program:
int PopCnt_Simple(int x) {
int numBits = 0;
int i;
//for (i = 0; i < 32; i++) {
for (i = 0; x != 0; i++) {
if (x & 1)
numBits++;
x >>= 1;
}
return numBits;
}
I also did chec...