Reading extern values meant these couldn't be compile-time constants.
math.h has INFINITY, which is macro that is supposed to expand to float +inf.
On MSVC it seems it's natively a double, so we cast just to make sure.
There's nan(const char*) in math.h for NaN too, but I don't trust that
to be compile-time evaluated. So instead, we keep reinterpreting a bit pattern.
I did try to write
static constexpr float float_nan() { ... }
and completely failed. constexpr seems a bit too restrictive in C++11 to make
it work, but Clang kept telling me, you'll be able to do this with C++14.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2233853002
Review-Url: https://codereview.chromium.org/2233853002
On my Mac (so, immintrin), this improves compile time, both wall and cpu,
by about 16%. To test I ran this on an SSD with files hot in their caches:
$ env CC=/usr/bin/clang CXX=/usr/bin/clang++ ./gyp_skia && \
ninja -C out/Release -t clean && \
time ninja -C out/Release
Before: 159 wall / 3367 cpu
159 wall / 3368 cpu
After: 137 wall / 2860 cpu
136 wall / 2863 cpu
I also tried further refining immintrin down to emmintrin / tmmintrin / smmintrin etc.
That made no signficant difference, so I've kept immintrin for its simplicity.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2045633002
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
TBR=reed@google.com
No public API changes.
Committed: https://skia.googlesource.com/skia/+/12dfaaa53c23f3d03050bde8f64136ac1f44164a
Review-Url: https://codereview.chromium.org/2045633002
Reason for revert:
Appears to have broken the ARMv7 aspect of the Google3 roll in bizarre seemingly-unrelated ways.
Original issue's description:
> Move immintrin/arm_neon includes to where they are used.
>
> On my Mac (so, immintrin), this improves compile time, both wall and cpu,
> by about 16%. To test I ran this on an SSD with files hot in their caches:
>
> $ env CC=/usr/bin/clang CXX=/usr/bin/clang++ ./gyp_skia && \
> ninja -C out/Release -t clean && \
> time ninja -C out/Release
>
> Before: 159 wall / 3367 cpu
> 159 wall / 3368 cpu
>
> After: 137 wall / 2860 cpu
> 136 wall / 2863 cpu
>
> I also tried further refining immintrin down to emmintrin / tmmintrin / smmintrin etc.
> That made no signficant difference, so I've kept immintrin for its simplicity.
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2045633002
> CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
>
> TBR=reed@google.com
> No public API changes.
>
> Committed: https://skia.googlesource.com/skia/+/12dfaaa53c23f3d03050bde8f64136ac1f44164aTBR=herb@google.com,mtklein@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:
Review-Url: https://codereview.chromium.org/2046213002
On my Mac (so, immintrin), this improves compile time, both wall and cpu,
by about 16%. To test I ran this on an SSD with files hot in their caches:
$ env CC=/usr/bin/clang CXX=/usr/bin/clang++ ./gyp_skia && \
ninja -C out/Release -t clean && \
time ninja -C out/Release
Before: 159 wall / 3367 cpu
159 wall / 3368 cpu
After: 137 wall / 2860 cpu
136 wall / 2863 cpu
I also tried further refining immintrin down to emmintrin / tmmintrin / smmintrin etc.
That made no signficant difference, so I've kept immintrin for its simplicity.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2045633002
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
TBR=reed@google.com
No public API changes.
Review-Url: https://codereview.chromium.org/2045633002
