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Update 4-at-a-time APIs.

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There is no reason to require the 4 SkPMFloats (registers) to be adjacent.
The only potential win in loads and stores comes from the SkPMColors being adjacent.

Makes no difference to existing bench.

BUG=skia:

Review URL: https://codereview.chromium.org/1035583002
This commit is contained in:
mtklein 2015-03-25 13:43:34 -07:00 committed by Commit bot
parent 2af858354d
commit 15391ee4ac
7 changed files with 155 additions and 48 deletions
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36
bench/PMFloatBench.cpp
View File

@ -1,3 +1,10 @@
/*
* Copyright 2015 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 "SkPMFloat.h"
@ -49,21 +56,32 @@ struct PMFloatBench : public Benchmark {
colors[3] = seed + 3;
#endif
SkPMFloat floats[4];
SkPMFloat fa,fb,fc,fd;
if (kWide) {
SkPMFloat::From4PMColors(floats, colors);
SkPMFloat::From4PMColors(colors, &fa, &fb, &fc, &fd);
} else {
for (int i = 0; i < 4; i++) {
floats[i] = SkPMFloat::FromPMColor(colors[i]);
}
fa = SkPMFloat::FromPMColor(colors[0]);
fb = SkPMFloat::FromPMColor(colors[1]);
fc = SkPMFloat::FromPMColor(colors[2]);
fd = SkPMFloat::FromPMColor(colors[3]);
}
SkPMColor back[4];
switch (kClamp << 1 | kWide) {
case 0: for (int i = 0; i < 4; i++) { back[i] = floats[i].get(); } break;
case 1: SkPMFloat::To4PMColors(back, floats); break;
case 2: for (int i = 0; i < 4; i++) { back[i] = floats[i].clamped(); } break;
case 3: SkPMFloat::ClampTo4PMColors(back, floats); break;
case 0: {
back[0] = fa.get();
back[1] = fb.get();
back[2] = fc.get();
back[3] = fd.get();
} break;
case 1: SkPMFloat::To4PMColors(fa, fb, fc, fd, back); break;
case 2: {
back[0] = fa.clamped();
back[1] = fb.clamped();
back[2] = fc.clamped();
back[3] = fd.clamped();
} break;
case 3: SkPMFloat::ClampTo4PMColors(fa, fb, fc, fd, back); break;
}
for (int i = 0; i < 4; i++) {
junk ^= back[i];

15
src/core/SkPMFloat.h
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@ -1,3 +1,10 @@
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPM_DEFINED
#define SkPM_DEFINED
@ -20,7 +27,7 @@ public:
static SkPMFloat FromARGB(float a, float r, float g, float b) { return SkPMFloat(a,r,g,b); }
// May be more efficient than one at a time. No special alignment assumed for SkPMColors.
static void From4PMColors(SkPMFloat[4], const SkPMColor[4]);
static void From4PMColors(const SkPMColor[4], SkPMFloat*, SkPMFloat*, SkPMFloat*, SkPMFloat*);
explicit SkPMFloat(SkPMColor);
SkPMFloat(float a, float r, float g, float b) {
@ -51,8 +58,10 @@ public:
SkPMColor clamped() const; // Will clamp all values to [0, 255]. Then may assert isValid().
// 4-at-a-time versions of get() and clamped(). Like From4PMColors(), no alignment assumed.
static void To4PMColors(SkPMColor[4], const SkPMFloat[4]);
static void ClampTo4PMColors(SkPMColor[4], const SkPMFloat[4]);
static void To4PMColors(
const SkPMFloat&, const SkPMFloat&, const SkPMFloat&, const SkPMFloat&, SkPMColor[4]);
static void ClampTo4PMColors(
const SkPMFloat&, const SkPMFloat&, const SkPMFloat&, const SkPMFloat&, SkPMColor[4]);
bool isValid() const {
return this->a() >= 0 && this->a() <= 255

35
src/opts/SkPMFloat_SSE2.h
View File

@ -1,3 +1,10 @@
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
inline SkPMFloat& SkPMFloat::operator=(const SkPMFloat& that) {
fColors = that.fColors;
return *this;
@ -34,25 +41,31 @@ inline SkPMColor SkPMFloat::clamped() const {
return c;
}
inline void SkPMFloat::From4PMColors(SkPMFloat floats[4], const SkPMColor colors[4]) {
inline void SkPMFloat::From4PMColors(const SkPMColor colors[4],
SkPMFloat* a, SkPMFloat* b, SkPMFloat* c, SkPMFloat* d) {
// Haven't beaten this yet.
for (int i = 0; i < 4; i++) { floats[i] = FromPMColor(colors[i]); }
*a = FromPMColor(colors[0]);
*b = FromPMColor(colors[1]);
*c = FromPMColor(colors[2]);
*d = FromPMColor(colors[3]);
}
inline void SkPMFloat::To4PMColors(SkPMColor colors[4], const SkPMFloat floats[4]) {
SkASSERT(floats[0].isValid() && floats[1].isValid()
&& floats[2].isValid() && floats[3].isValid());
inline void SkPMFloat::To4PMColors(
const SkPMFloat& a, const SkPMFloat& b, const SkPMFloat&c, const SkPMFloat& d,
SkPMColor colors[4]) {
// Haven't beaten this yet.
ClampTo4PMColors(colors, floats);
ClampTo4PMColors(a,b,c,d, colors);
}
inline void SkPMFloat::ClampTo4PMColors(SkPMColor colors[4], const SkPMFloat floats[4]) {
inline void SkPMFloat::ClampTo4PMColors(
const SkPMFloat& a, const SkPMFloat& b, const SkPMFloat&c, const SkPMFloat& d,
SkPMColor colors[4]) {
// Same as _SSSE3.h's. We use 3 _mm_packus_epi16() where the naive loop uses 8.
// We don't use _mm_cvtps_epi32, because we want precise control over how 0.5 rounds (up).
__m128i c0 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), floats[0].fColors)),
c1 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), floats[1].fColors)),
c2 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), floats[2].fColors)),
c3 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), floats[3].fColors));
__m128i c0 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), a.fColors)),
c1 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), b.fColors)),
c2 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), c.fColors)),
c3 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), d.fColors));
__m128i c3210 = _mm_packus_epi16(_mm_packus_epi16(c0, c1),
_mm_packus_epi16(c2, c3));
_mm_storeu_si128((__m128i*)colors, c3210);

38
src/opts/SkPMFloat_SSSE3.h
View File

@ -1,3 +1,10 @@
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
inline SkPMFloat& SkPMFloat::operator=(const SkPMFloat& that) {
fColors = that.fColors;
return *this;
@ -41,23 +48,34 @@ inline SkPMColor SkPMFloat::clamped() const {
return c;
}
inline void SkPMFloat::From4PMColors(SkPMFloat floats[4], const SkPMColor colors[4]) {
inline void SkPMFloat::From4PMColors(const SkPMColor colors[4],
SkPMFloat* a, SkPMFloat* b, SkPMFloat* c, SkPMFloat* d) {
// Haven't beaten this yet.
for (int i = 0; i < 4; i++) { floats[i] = FromPMColor(colors[i]); }
*a = FromPMColor(colors[0]);
*b = FromPMColor(colors[1]);
*c = FromPMColor(colors[2]);
*d = FromPMColor(colors[3]);
}
inline void SkPMFloat::To4PMColors(SkPMColor colors[4], const SkPMFloat floats[4]) {
// Haven't beaten this yet. Still faster than ClampTo4PMColors too.
for (int i = 0; i < 4; i++) { colors[i] = floats[i].get(); }
inline void SkPMFloat::To4PMColors(
const SkPMFloat& a, const SkPMFloat& b, const SkPMFloat&c, const SkPMFloat& d,
SkPMColor colors[4]) {
// Haven't beaten this yet. Still faster than ClampTo4PMColors?
colors[0] = a.get();
colors[1] = b.get();
colors[2] = c.get();
colors[3] = d.get();
}
inline void SkPMFloat::ClampTo4PMColors(SkPMColor colors[4], const SkPMFloat floats[4]) {
inline void SkPMFloat::ClampTo4PMColors(
const SkPMFloat& a, const SkPMFloat& b, const SkPMFloat&c, const SkPMFloat& d,
SkPMColor colors[4]) {
// Same as _SSE2.h's. We use 3 _mm_packus_epi16() where the naive loop uses 8.
// We don't use _mm_cvtps_epi32, because we want precise control over how 0.5 rounds (up).
__m128i c0 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), floats[0].fColors)),
c1 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), floats[1].fColors)),
c2 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), floats[2].fColors)),
c3 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), floats[3].fColors));
__m128i c0 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), a.fColors)),
c1 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), b.fColors)),
c2 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), c.fColors)),
c3 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), d.fColors));
__m128i c3210 = _mm_packus_epi16(_mm_packus_epi16(c0, c1),
_mm_packus_epi16(c2, c3));
_mm_storeu_si128((__m128i*)colors, c3210);

33
src/opts/SkPMFloat_neon.h
View File

@ -1,3 +1,10 @@
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
inline SkPMFloat& SkPMFloat::operator=(const SkPMFloat& that) {
fColors = that.fColors;
return *this;
@ -41,14 +48,28 @@ inline SkPMColor SkPMFloat::clamped() const {
}
// TODO: we should be able to beat these loops on all three methods.
inline void SkPMFloat::From4PMColors(SkPMFloat floats[4], const SkPMColor colors[4]) {
for (int i = 0; i < 4; i++) { floats[i] = FromPMColor(colors[i]); }
inline void SkPMFloat::From4PMColors(const SkPMColor colors[4],
SkPMFloat* a, SkPMFloat* b, SkPMFloat* c, SkPMFloat* d) {
*a = FromPMColor(colors[0]);
*b = FromPMColor(colors[1]);
*c = FromPMColor(colors[2]);
*d = FromPMColor(colors[3]);
}
inline void SkPMFloat::To4PMColors(SkPMColor colors[4], const SkPMFloat floats[4]) {
for (int i = 0; i < 4; i++) { colors[i] = floats[i].get(); }
inline void SkPMFloat::To4PMColors(
const SkPMFloat& a, const SkPMFloat& b, const SkPMFloat&c, const SkPMFloat& d,
SkPMColor colors[4]) {
colors[0] = a.get();
colors[1] = b.get();
colors[2] = c.get();
colors[3] = d.get();
}
inline void SkPMFloat::ClampTo4PMColors(SkPMColor colors[4], const SkPMFloat floats[4]) {
for (int i = 0; i < 4; i++) { colors[i] = floats[i].clamped(); }
inline void SkPMFloat::ClampTo4PMColors(
const SkPMFloat& a, const SkPMFloat& b, const SkPMFloat&c, const SkPMFloat& d,
SkPMColor colors[4]) {
colors[0] = a.clamped();
colors[1] = b.clamped();
colors[2] = c.clamped();
colors[3] = d.clamped();
}

33
src/opts/SkPMFloat_none.h
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@ -1,3 +1,10 @@
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
inline SkPMFloat& SkPMFloat::operator=(const SkPMFloat& that) {
for (int i = 0; i < 4; i++) { fColor[i] = that.fColor[i]; }
return *this;
@ -28,14 +35,28 @@ inline SkPMColor SkPMFloat::clamped() const {
return SkPackARGB32(a+0.5f, r+0.5f, g+0.5f, b+0.5f);
}
inline void SkPMFloat::From4PMColors(SkPMFloat floats[4], const SkPMColor colors[4]) {
for (int i = 0; i < 4; i++) { floats[i] = FromPMColor(colors[i]); }
inline void SkPMFloat::From4PMColors(const SkPMColor colors[4],
SkPMFloat* a, SkPMFloat* b, SkPMFloat* c, SkPMFloat* d) {
*a = FromPMColor(colors[0]);
*b = FromPMColor(colors[1]);
*c = FromPMColor(colors[2]);
*d = FromPMColor(colors[3]);
}
inline void SkPMFloat::To4PMColors(SkPMColor colors[4], const SkPMFloat floats[4]) {
for (int i = 0; i < 4; i++) { colors[i] = floats[i].get(); }
inline void SkPMFloat::To4PMColors(
const SkPMFloat& a, const SkPMFloat& b, const SkPMFloat&c, const SkPMFloat& d,
SkPMColor colors[4]) {
colors[0] = a.get();
colors[1] = b.get();
colors[2] = c.get();
colors[3] = d.get();
}
inline void SkPMFloat::ClampTo4PMColors(SkPMColor colors[4], const SkPMFloat floats[4]) {
for (int i = 0; i < 4; i++) { colors[i] = floats[i].clamped(); }
inline void SkPMFloat::ClampTo4PMColors(
const SkPMFloat& a, const SkPMFloat& b, const SkPMFloat&c, const SkPMFloat& d,
SkPMColor colors[4]) {
colors[0] = a.clamped();
colors[1] = b.clamped();
colors[2] = c.clamped();
colors[3] = d.clamped();
}

13
tests/PMFloatTest.cpp
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@ -1,3 +1,10 @@
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkPMFloat.h"
#include "Test.h"
@ -33,15 +40,15 @@ DEF_TEST(SkPMFloat, r) {
// Test 4-at-a-time conversions.
SkPMColor colors[4] = { 0xFF000000, 0xFFFF0000, 0xFF00FF00, 0xFF0000FF };
SkPMFloat floats[4];
SkPMFloat::From4PMColors(floats, colors);
SkPMFloat::From4PMColors(colors, floats+0, floats+1, floats+2, floats+3);
SkPMColor back[4];
SkPMFloat::To4PMColors(back, floats);
SkPMFloat::To4PMColors(floats[0], floats[1], floats[2], floats[3], back);
for (int i = 0; i < 4; i++) {
REPORTER_ASSERT(r, back[i] == colors[i]);
}
SkPMFloat::ClampTo4PMColors(back, floats);
SkPMFloat::ClampTo4PMColors(floats[0], floats[1], floats[2], floats[3], back);
for (int i = 0; i < 4; i++) {
REPORTER_ASSERT(r, back[i] == colors[i]);
}