tree 62fccd2b4c04aaa60b898c5c5b0b41ce1f40cfb0
parent d6767aa2d52d2612f2b7f9b27b1c3e72ac1389cd
author mtklein <mtklein@chromium.org> 1468256361 -0700
committer Commit bot <commit-bot@chromium.org> 1468256361 -0700

Clean up hyper-local SkCpu feature test experiment.

    This removes the code paths where we make SkCpu::Supports() calls
    from within a tight loop.  It keeps code paths using SkCpu::Supports()
    to choose entire routines from src/opts/.

    We can't rely on these hyper-local checks to be hoisted up reliably enough.
    It worked pretty well with the first couple platforms we tried (e.g. Clang
    on Linux/Mac) but we can't gaurantee it works everywhere.

    Further, I'm not able to actually do anything fancy with those tests
    outside of x86... I've not found a way to get, say, NEON+F16 conversion
    code embedded into ordinary NEON code outside writing then entire function
    in external assembly.

    This whole idea becomes less important now that we've got a way to chain
    separate function calls together efficiently.  We can now, e.g., use an
    AVX+F16C method to load some pixels, then chain that into an ordinary AVX
    method to color filter them.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2138073002
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot

Review-Url: https://codereview.chromium.org/2138073002