Guard Denormals-Are-Zero with runtime CPU check#12386
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colesbury wants to merge 1 commit intopytorch:masterfrom
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Guard Denormals-Are-Zero with runtime CPU check#12386colesbury wants to merge 1 commit intopytorch:masterfrom
colesbury wants to merge 1 commit intopytorch:masterfrom
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Previously, we were only enabling Flush-To-Zero (FTZ) and Denormals-Are-Zero (DAZ) when compiling with SSE3 enabled. After, Christian's patch (pytorch#12109) we won't be compiling core files with SSE3 or SSE4 enabled, to better support older AMD processors. This moves the FTZ and DAZ code behind a runtime CPU check in preparation for that change.
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gchanan
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Oct 5, 2018
| static constexpr unsigned int DENORMALS_ZERO = 0x0040; | ||
| static constexpr unsigned int FLUSH_ZERO = 0x8000; | ||
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| bool set_flush_denormal(bool on) { |
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Summary: Previously, we were only enabling Flush-To-Zero (FTZ) and Denormals-Are-Zero (DAZ) when compiling with SSE3 enabled. After, Christian's patch (pytorch/pytorch#12109) we won't be compiling core files with SSE3 or SSE4 enabled, to better support older AMD processors. This moves the FTZ and DAZ code behind a runtime CPU check in preparation for that change. Pull Request resolved: pytorch/pytorch#12386 Differential Revision: D10222237 Pulled By: colesbury fbshipit-source-id: 7ffe32561ab965e1e5f9eb6e679602bbf4775538
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Previously, we were only enabling Flush-To-Zero (FTZ) and
Denormals-Are-Zero (DAZ) when compiling with SSE3 enabled. After,
Christian's patch (#12109) we
won't be compiling core files with SSE3 or SSE4 enabled, to better
support older AMD processors.
This moves the FTZ and DAZ code behind a runtime CPU check in
preparation for that change.