Inada Naoki <songofaca...@gmail.com> added the comment:

I tested before, after, Steve's patch, and my patch with gcc 8.3.0 and PGO+LTO.
https://gist.github.com/methane/f6077bd1b0b04d40a9c790d9ed670a44#file-gcc-8-3-0-pgo-md

Surprisingly, there is no difference.  Even my patch didn't help register 
allocation when PGO is enabled.

I will run same test with other compilers & PGO (enabled|disabled).

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<https://bugs.python.org/issue37587>
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