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| author |  mtklein <mtklein@chromium.org> | 2015-07-14 10:54:19 -0700 |
|---|---|---|
| committer |  Commit bot <commit-bot@chromium.org> | 2015-07-14 10:54:19 -0700 |
| commit | 4be181e304d2b280c6801bd13369cfba236d1a66 (patch) | |
| tree | ae0510f8a6504c3333582fa004e961a8771a2d99 /src/opts/Sk4px_SSE2.h | |
| parent | a5517e2b190a8083b38964972b031c13e99f1012 (diff) | |
3-15% speedup to HardLight / Overlay xfermodes.
While investigating my bug (skia:4052) I saw this TODO and figured
it'd make me feel better about an otherwise unsuccessful investigation.
This speeds up HardLight and Overlay (same code) by about 15% with SSE, mostly
by rewriting the logic from 1 cheap comparison and 2 expensive div255() calls
to 2 cheap comparisons and 1 expensive div255().
NEON speeds up by a more modest ~3%.
BUG=skia:
Review URL: https://codereview.chromium.org/1230663005
Diffstat (limited to 'src/opts/Sk4px_SSE2.h')
| -rw-r--r-- | src/opts/Sk4px_SSE2.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/opts/Sk4px_SSE2.h b/src/opts/Sk4px_SSE2.h index 74ccffc277..3809c5e47b 100644 --- a/src/opts/Sk4px_SSE2.h +++ b/src/opts/Sk4px_SSE2.h @@ -31,6 +31,11 @@ inline Sk4px::Wide Sk4px::widenHi() const { _mm_unpackhi_epi8(_mm_setzero_si128(), this->fVec)); } +inline Sk4px::Wide Sk4px::widenLoHi() const { + return Sk16h(_mm_unpacklo_epi8(this->fVec, this->fVec), + _mm_unpackhi_epi8(this->fVec, this->fVec)); +} + inline Sk4px::Wide Sk4px::mulWiden(const Sk16b& other) const { return this->widenLo() * Sk4px(other).widenLo(); } |