[vec128] Fix fmsub NEON defintion #152075
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/152075
Note: Links to docs will display an error until the docs builds have been completed. ⏳ No Failures, 43 PendingAs of commit e61b271 with merge base 2f74cff ( UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:
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As reported in #149292 According to manual, `vfmsq_f32` implements `c - a * b` rather than `a * b - c`, so it's call must be prefixed with `vnegq_f32` Also, adjust the tests to use OpMath for FMA computation to avoid accuracy error accumulation due to non-fused multiply-and-add over lower precision dtypes Run `./bin/vec_test_all_types_DEFAULT` during MacOS testing Fixes #149292 ghstack-source-id: 2b49ca2 Pull Request resolved: #152075
malfet
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As reported in #149292 According to manual, `vfmsq_f32` implements `c - a * b` rather than `a * b - c`, so it's call must be prefixed with `vnegq_f32` Also, adjust the tests to use OpMath for FMA computation to avoid accuracy error accumulation due to non-fused multiply-and-add over lower precision dtypes Run `./bin/vec_test_all_types_DEFAULT` during MacOS testing Fixes #149292 ghstack-source-id: 58b498b Pull Request resolved: #152075
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@pytorchbot cherry-pick --onto release/2.7 -c critical |
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As reported in #149292, according to manual, `vfmsq_f32` implements `c - a * b` rather than `a * b - c`, so it's call must be prefixed with `vnegq_f32` Also, adjust the tests to use OpMath for FMA computation to avoid accuracy error accumulation due to non-fused multiply-and-add over lower precision dtypes Note that `Vectorized::fmsub` is not currently instantiated anywhere, so it could safely remain broken TODO: - Enable C++ testing on MacOS and/or aarch64 platforms (right now Mac tests are build without C++ tests) Fixes #149292 Pull Request resolved: #152075 Approved by: https://github.com/swolchok ghstack dependencies: #151955 (cherry picked from commit 2ea8653)
Cherry picking #152075The cherry pick PR is at #153093 and it is recommended to link a critical cherry pick PR with an issue. The following tracker issues are updated: Details for Dev Infra teamRaised by workflow job |
atalman
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[vec128] Fix fmsub NEON defintion (#152075) As reported in #149292, according to manual, `vfmsq_f32` implements `c - a * b` rather than `a * b - c`, so it's call must be prefixed with `vnegq_f32` Also, adjust the tests to use OpMath for FMA computation to avoid accuracy error accumulation due to non-fused multiply-and-add over lower precision dtypes Note that `Vectorized::fmsub` is not currently instantiated anywhere, so it could safely remain broken TODO: - Enable C++ testing on MacOS and/or aarch64 platforms (right now Mac tests are build without C++ tests) Fixes #149292 Pull Request resolved: #152075 Approved by: https://github.com/swolchok ghstack dependencies: #151955 (cherry picked from commit 2ea8653) Co-authored-by: Nikita Shulga <[email protected]>
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Stack from ghstack (oldest at bottom):
As reported in #149292, according to manual,
vfmsq_f32implementsc - a * brather thana * b - c, so it's call must be prefixed withvnegq_f32Also, adjust the tests to use OpMath for FMA computation to avoid accuracy error accumulation due to non-fused multiply-and-add over lower precision dtypes
Note that
Vectorized::fmsubis not currently instantiated anywhere, so it could safely remain brokenTODO:
Fixes #149292
cc @jgong5 @mingfeima @XiaobingSuper @sanchitintel @ashokei @jingxu10 @jerryzh168