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Re: New rematerialization sub-pass in LRA


Vladimir Makarov wrote:
>   I've tested and benchmarked the sub-pass on x86-64 and ARM.  The
> sub-pass permits to generate a smaller code in average on both
> architecture (although improvement no-significant), adds < 0.4%
> additional compilation time in -O2 mode of release GCC (according user
> time of compilation of 500K lines fortran program and valgrind lakey #
> insns in combine.i compilation) and about 0.7% in -O0 mode.  As the
> performance result, the best I found is 1% SPECFP2000 improvement on
> ARM Ecynos 5410 (973 vs 963) but for Intel Haswell the performance
> results are practically the same (Haswell has a very good
> sophisticated memory sub-system).

On aarch64 I have seen some minor perf improvements to libpng compress and
decompress.  The patch does not change the perf for all other benchmarks that I
have tested.

Thanks,
Sebastian


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