diff options
Diffstat (limited to 'bench/Sk4fBench.cpp')
| -rw-r--r-- | bench/Sk4fBench.cpp | 28 |
1 files changed, 8 insertions, 20 deletions
diff --git a/bench/Sk4fBench.cpp b/bench/Sk4fBench.cpp index 823e14c0af..d5201fa2f0 100644 --- a/bench/Sk4fBench.cpp +++ b/bench/Sk4fBench.cpp @@ -9,16 +9,8 @@ #include "SkColor.h" #include "SkNx.h" -// Used to prevent the compiler from optimizing away the whole loop. -volatile uint64_t blackhole = 0; - -// Not a great random number generator, but it's very fast. -// The code we're measuring is quite fast, so low overhead is essential. -static uint64_t lcg_rand(uint64_t* seed) { - *seed *= 1664525; - *seed += 1013904223; - return *seed; -} +// Writing into this array prevents the loops from being compiled away. +static volatile float blackhole[4]; template <typename T> struct Sk4fRoundtripBench : public Benchmark { @@ -28,6 +20,7 @@ struct Sk4fRoundtripBench : public Benchmark { switch (sizeof(T)) { case 1: return "Sk4f_roundtrip_u8"; case 2: return "Sk4f_roundtrip_u16"; + case 4: return "Sk4f_roundtrip_int"; } SkASSERT(false); return ""; @@ -36,21 +29,16 @@ struct Sk4fRoundtripBench : public Benchmark { bool isSuitableFor(Backend backend) override { return backend == kNonRendering_Backend; } void onDraw(int loops, SkCanvas* canvas) override { - // Unlike blackhole, junk can and probably will be a register. - uint64_t junk = 0; - uint64_t seed = 0; - for (int i = 0; i < loops; i++) { - uint64_t src = lcg_rand(&seed), - back; - auto f = SkNx_cast<float>(SkNx<4,T>::Load(&src)); - SkNx_cast<T>(f).store(&back); - junk ^= back; + Sk4f fs(1,2,3,4); + while (loops --> 0) { + fs = SkNx_cast<float>(SkNx_cast<T>(fs)); } - blackhole ^= junk; + fs.store((float*)blackhole); } }; DEF_BENCH(return new Sk4fRoundtripBench<uint8_t>;) DEF_BENCH(return new Sk4fRoundtripBench<uint16_t>;) +DEF_BENCH(return new Sk4fRoundtripBench<int>;) struct Sk4fGradientBench : public Benchmark { const char* onGetName() override { return "Sk4f_gradient"; } |