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x64/LJ_GC64 tuning #225

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MikePall opened this issue Oct 16, 2016 · 0 comments

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2.1 enhancement x64

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MikePall commented Oct 16, 2016

Moved from PR #149:

Various places use a 64 bit store plus a 32 bit load-modify-store to tag a value in memory. This is probably suboptimal for the CPU write combiner, but really needs to be benchmarked.
Benchmark x64/!LJ_GC64 against x64/LJ_GC64 to find regressions and more tuning opportunities.

MikePall added enhancement 2.1 x64 labels

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Major steps toward finishing LJ_GC64 mode #149

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