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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Benchmark.h"
#include "SkFloatBits.h"
#include "SkRandom.h"
#include "SkRect.h"
#include "SkString.h"
class ScalarBench : public Benchmark {
SkString fName;
public:
ScalarBench(const char name[]) {
fName.printf("scalar_%s", name);
}
virtual bool isSuitableFor(Backend backend) SK_OVERRIDE {
return backend == kNonRendering_Backend;
}
virtual void performTest() = 0;
protected:
virtual int mulLoopCount() const { return 1; }
virtual const char* onGetName() SK_OVERRIDE {
return fName.c_str();
}
virtual void onDraw(const int loops, SkCanvas* canvas) {
for (int i = 0; i < loops; i++) {
this->performTest();
}
}
private:
typedef Benchmark INHERITED;
};
// having unknown values in our arrays can throw off the timing a lot, perhaps
// handling NaN values is a lot slower. Anyway, this guy is just meant to put
// reasonable values in our arrays.
template <typename T> void init9(T array[9]) {
SkRandom rand;
for (int i = 0; i < 9; i++) {
array[i] = rand.nextSScalar1();
}
}
class FloatComparisonBench : public ScalarBench {
public:
FloatComparisonBench() : INHERITED("compare_float") {
init9(fArray);
}
protected:
virtual int mulLoopCount() const { return 4; }
virtual void performTest() {
// xoring into a volatile prevents the compiler from optimizing these checks away.
volatile bool junk = false;
junk ^= (fArray[6] != 0.0f || fArray[7] != 0.0f || fArray[8] != 1.0f);
junk ^= (fArray[2] != 0.0f || fArray[5] != 0.0f);
}
private:
float fArray[9];
typedef ScalarBench INHERITED;
};
class ForcedIntComparisonBench : public ScalarBench {
public:
ForcedIntComparisonBench()
: INHERITED("compare_forced_int") {
init9(fArray);
}
protected:
virtual int mulLoopCount() const { return 4; }
virtual void performTest() {
// xoring into a volatile prevents the compiler from optimizing these checks away.
volatile int32_t junk = 0;
junk ^= (SkScalarAs2sCompliment(fArray[6]) |
SkScalarAs2sCompliment(fArray[7]) |
(SkScalarAs2sCompliment(fArray[8]) - kPersp1Int));
junk ^= (SkScalarAs2sCompliment(fArray[2]) |
SkScalarAs2sCompliment(fArray[5]));
}
private:
static const int32_t kPersp1Int = 0x3f800000;
SkScalar fArray[9];
typedef ScalarBench INHERITED;
};
class IsFiniteScalarBench : public ScalarBench {
public:
IsFiniteScalarBench() : INHERITED("isfinite") {
SkRandom rand;
for (size_t i = 0; i < ARRAY_N; ++i) {
fArray[i] = rand.nextSScalar1();
}
}
protected:
virtual int mulLoopCount() const { return 1; }
virtual void performTest() SK_OVERRIDE {
int sum = 0;
for (size_t i = 0; i < ARRAY_N; ++i) {
// We pass -fArray[i], so the compiler can't cheat and treat the
// value as an int (even though we tell it that it is a float)
sum += SkScalarIsFinite(-fArray[i]);
}
// we do this so the compiler won't optimize our loop away...
this->doSomething(fArray, sum);
}
virtual void doSomething(SkScalar array[], int sum) {}
private:
enum {
ARRAY_N = 64
};
SkScalar fArray[ARRAY_N];
typedef ScalarBench INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
class RectBoundsBench : public Benchmark {
enum {
PTS = 100,
};
SkPoint fPts[PTS];
public:
RectBoundsBench() {
SkRandom rand;
for (int i = 0; i < PTS; ++i) {
fPts[i].fX = rand.nextSScalar1();
fPts[i].fY = rand.nextSScalar1();
}
}
virtual bool isSuitableFor(Backend backend) SK_OVERRIDE {
return backend == kNonRendering_Backend;
}
protected:
virtual const char* onGetName() SK_OVERRIDE {
return "rect_bounds";
}
virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
SkRect r;
for (int i = 0; i < loops; ++i) {
r.set(fPts, PTS);
}
}
private:
typedef Benchmark INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
DEF_BENCH( return new FloatComparisonBench(); )
DEF_BENCH( return new ForcedIntComparisonBench(); )
DEF_BENCH( return new RectBoundsBench(); )
DEF_BENCH( return new IsFiniteScalarBench(); )
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