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v0.5 - MSVC doesn't compile the loop properly #47

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cmuratori opened this issue May 18, 2019 · 1 comment
Open

v0.5 - MSVC doesn't compile the loop properly #47

cmuratori opened this issue May 18, 2019 · 1 comment

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@cmuratori
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CLANG gets the full speed, MSVC doesn't - I haven't looked into it yet but this is a reminder to see if MSVC can be coerced into not screwing it up.

- Casey
@cmuratori
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I took a look at this and unfortunately, although I was able to force the instruction ordering by using a ReadWriteBarrier, I'm not sure that was actually a problem at all... the problem appears to be that the register allocator forces a huge amount of xmm1 usage for no apparent reason. That's the only particular thing I can see different between this code and the CLANG code which runs at speed.

- Casey

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@cmuratori