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#include "SkBenchmark.h"
#include "SkColorPriv.h"
#include "SkMatrix.h"
#include "SkRandom.h"
#include "SkString.h"
class MathBench : public SkBenchmark {
enum {
kBuffer = 100,
kLoop = 10000
};
SkString fName;
float fSrc[kBuffer], fDst[kBuffer];
public:
MathBench(void* param, const char name[]) : INHERITED(param) {
fName.printf("math_%s", name);
SkRandom rand;
for (int i = 0; i < kBuffer; ++i) {
fSrc[i] = rand.nextSScalar1();
}
}
virtual void performTest(float dst[], const float src[], int count) = 0;
protected:
virtual int mulLoopCount() const { return 1; }
virtual const char* onGetName() {
return fName.c_str();
}
virtual void onDraw(SkCanvas* canvas) {
int n = SkBENCHLOOP(kLoop * this->mulLoopCount());
for (int i = 0; i < n; i++) {
this->performTest(fDst, fSrc, kBuffer);
}
}
private:
typedef SkBenchmark INHERITED;
};
class MathBenchU32 : public MathBench {
public:
MathBenchU32(void* param, const char name[]) : INHERITED(param, name) {}
protected:
virtual void performITest(uint32_t* dst, const uint32_t* src, int count) = 0;
virtual void performTest(float* SK_RESTRICT dst, const float* SK_RESTRICT src,
int count) SK_OVERRIDE {
uint32_t* d = SkTCast<uint32_t*>(dst);
const uint32_t* s = SkTCast<const uint32_t*>(src);
this->performITest(d, s, count);
}
private:
typedef MathBench INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
class NoOpMathBench : public MathBench {
public:
NoOpMathBench(void* param) : INHERITED(param, "noOp") {}
protected:
virtual void performTest(float dst[], const float src[], int count) {
for (int i = 0; i < count; ++i) {
dst[i] = src[i] + 1;
}
}
private:
typedef MathBench INHERITED;
};
class SlowISqrtMathBench : public MathBench {
public:
SlowISqrtMathBench(void* param) : INHERITED(param, "slowIsqrt") {}
protected:
virtual void performTest(float dst[], const float src[], int count) {
for (int i = 0; i < count; ++i) {
dst[i] = 1.0f / sk_float_sqrt(src[i]);
}
}
private:
typedef MathBench INHERITED;
};
static inline float SkFastInvSqrt(float x) {
float xhalf = 0.5f*x;
int i = *(int*)&x;
i = 0x5f3759df - (i>>1);
x = *(float*)&i;
x = x*(1.5f-xhalf*x*x);
// x = x*(1.5f-xhalf*x*x); // this line takes err from 10^-3 to 10^-6
return x;
}
class FastISqrtMathBench : public MathBench {
public:
FastISqrtMathBench(void* param) : INHERITED(param, "fastIsqrt") {}
protected:
virtual void performTest(float dst[], const float src[], int count) {
for (int i = 0; i < count; ++i) {
dst[i] = SkFastInvSqrt(src[i]);
}
}
private:
typedef MathBench INHERITED;
};
static inline uint32_t QMul64(uint32_t value, U8CPU alpha) {
SkASSERT((uint8_t)alpha == alpha);
const uint32_t mask = 0xFF00FF;
uint64_t tmp = value;
tmp = (tmp & mask) | ((tmp & ~mask) << 24);
tmp *= alpha;
return ((tmp >> 8) & mask) | ((tmp >> 32) & ~mask);
}
class QMul64Bench : public MathBenchU32 {
public:
QMul64Bench(void* param) : INHERITED(param, "qmul64") {}
protected:
virtual void performITest(uint32_t* SK_RESTRICT dst,
const uint32_t* SK_RESTRICT src,
int count) SK_OVERRIDE {
for (int i = 0; i < count; ++i) {
dst[i] = QMul64(src[i], (uint8_t)i);
}
}
private:
typedef MathBenchU32 INHERITED;
};
class QMul32Bench : public MathBenchU32 {
public:
QMul32Bench(void* param) : INHERITED(param, "qmul32") {}
protected:
virtual void performITest(uint32_t* SK_RESTRICT dst,
const uint32_t* SK_RESTRICT src,
int count) SK_OVERRIDE {
for (int i = 0; i < count; ++i) {
dst[i] = SkAlphaMulQ(src[i], (uint8_t)i);
}
}
private:
typedef MathBenchU32 INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
static SkBenchmark* M0(void* p) { return new NoOpMathBench(p); }
static SkBenchmark* M1(void* p) { return new SlowISqrtMathBench(p); }
static SkBenchmark* M2(void* p) { return new FastISqrtMathBench(p); }
static SkBenchmark* M3(void* p) { return new QMul64Bench(p); }
static SkBenchmark* M4(void* p) { return new QMul32Bench(p); }
static BenchRegistry gReg0(M0);
static BenchRegistry gReg1(M1);
static BenchRegistry gReg2(M2);
static BenchRegistry gReg3(M3);
static BenchRegistry gReg4(M4);
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