Yingwei Zheng 637e81f8ad Reland [CodeGenPrepare] Convert ctpop(X) ==/!= 1 into ctpop(X) u</u> 2/1 (#111284) (#111998) ...

Relands #111284. Test failure with stage2 build has been fixed by
https://github.com/llvm/llvm-project/pull/111946.


Some targets have better codegen for `ctpop(X) u< 2` than `ctpop(X) ==
1`. After https://github.com/llvm/llvm-project/pull/100899, we set the
range of ctpop's return value to indicate the argument/result is
non-zero.

This patch converts `ctpop(X) ==/!= 1` into `ctpop(X) u</u> 2/1` in CGP
to fix https://github.com/llvm/llvm-project/issues/95255.

2024-10-15 08:17:50 +08:00

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