9ff378b01b
The benches for N <= 10 get around 2x faster on my N7 and N9. I believe this is because of the reduced function-call-then-function-pointer-call overhead on the N7, and additionally because it seems autovectorization beats our NEON code for small N on the N9. My desktop is unchanged, though that's probably because N=10 lies well within a region where memset's performance is essentially constant: N=100 takes only about 2x as long as N=1 and N=10, which perform nearly identically. BUG=skia: Review URL: https://codereview.chromium.org/1073863002
150 lines
5.1 KiB
C++
150 lines
5.1 KiB
C++
/*
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* Copyright 2006 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkUtils_DEFINED
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#define SkUtils_DEFINED
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#include "SkTypes.h"
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///////////////////////////////////////////////////////////////////////////////
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// Determined empirically using bench/MemsetBench.cpp on a Nexus 7, Nexus 9, and desktop.
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#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2 || defined(SK_ARM_HAS_NEON)
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// Platforms where we can assume an autovectorizer will give us a good inline memset.
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#define SK_SMALL_MEMSET 1000
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#else
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// Platforms like Chrome on ARMv7 that don't typically compile with NEON globally.
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#define SK_SMALL_MEMSET 10
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#endif
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/** Similar to memset(), but it assigns a 16bit value into the buffer.
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@param buffer The memory to have value copied into it
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@param value The 16bit value to be copied into buffer
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@param count The number of times value should be copied into the buffer.
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*/
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void sk_memset16_large(uint16_t dst[], uint16_t value, int count);
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inline void sk_memset16(uint16_t dst[], uint16_t value, int count) {
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if (count <= SK_SMALL_MEMSET) {
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for (int i = 0; i < count; i++) {
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dst[i] = value;
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}
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} else {
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sk_memset16_large(dst, value, count);
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}
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}
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typedef void (*SkMemset16Proc)(uint16_t dst[], uint16_t value, int count);
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SkMemset16Proc SkMemset16GetPlatformProc();
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/** Similar to memset(), but it assigns a 32bit value into the buffer.
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@param buffer The memory to have value copied into it
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@param value The 32bit value to be copied into buffer
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@param count The number of times value should be copied into the buffer.
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*/
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void sk_memset32_large(uint32_t dst[], uint32_t value, int count);
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inline void sk_memset32(uint32_t dst[], uint32_t value, int count) {
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if (count <= SK_SMALL_MEMSET) {
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for (int i = 0; i < count; i++) {
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dst[i] = value;
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}
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} else {
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sk_memset32_large(dst, value, count);
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}
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}
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typedef void (*SkMemset32Proc)(uint32_t dst[], uint32_t value, int count);
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SkMemset32Proc SkMemset32GetPlatformProc();
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#undef SK_SMALL_MEMSET
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/** Similar to memcpy(), but it copies count 32bit values from src to dst.
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@param dst The memory to have value copied into it
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@param src The memory to have value copied from it
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@param count The number of values should be copied.
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*/
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void sk_memcpy32(uint32_t dst[], const uint32_t src[], int count);
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typedef void (*SkMemcpy32Proc)(uint32_t dst[], const uint32_t src[], int count);
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SkMemcpy32Proc SkMemcpy32GetPlatformProc();
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///////////////////////////////////////////////////////////////////////////////
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#define kMaxBytesInUTF8Sequence 4
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#ifdef SK_DEBUG
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int SkUTF8_LeadByteToCount(unsigned c);
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#else
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#define SkUTF8_LeadByteToCount(c) ((((0xE5 << 24) >> ((unsigned)c >> 4 << 1)) & 3) + 1)
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#endif
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inline int SkUTF8_CountUTF8Bytes(const char utf8[]) {
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SkASSERT(utf8);
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return SkUTF8_LeadByteToCount(*(const uint8_t*)utf8);
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}
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int SkUTF8_CountUnichars(const char utf8[]);
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int SkUTF8_CountUnichars(const char utf8[], size_t byteLength);
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SkUnichar SkUTF8_ToUnichar(const char utf8[]);
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SkUnichar SkUTF8_NextUnichar(const char**);
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SkUnichar SkUTF8_PrevUnichar(const char**);
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/** Return the number of bytes need to convert a unichar
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into a utf8 sequence. Will be 1..kMaxBytesInUTF8Sequence,
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or 0 if uni is illegal.
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*/
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size_t SkUTF8_FromUnichar(SkUnichar uni, char utf8[] = NULL);
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///////////////////////////////////////////////////////////////////////////////
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#define SkUTF16_IsHighSurrogate(c) (((c) & 0xFC00) == 0xD800)
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#define SkUTF16_IsLowSurrogate(c) (((c) & 0xFC00) == 0xDC00)
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int SkUTF16_CountUnichars(const uint16_t utf16[]);
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int SkUTF16_CountUnichars(const uint16_t utf16[], int numberOf16BitValues);
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// returns the current unichar and then moves past it (*p++)
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SkUnichar SkUTF16_NextUnichar(const uint16_t**);
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// this guy backs up to the previus unichar value, and returns it (*--p)
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SkUnichar SkUTF16_PrevUnichar(const uint16_t**);
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size_t SkUTF16_FromUnichar(SkUnichar uni, uint16_t utf16[] = NULL);
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size_t SkUTF16_ToUTF8(const uint16_t utf16[], int numberOf16BitValues,
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char utf8[] = NULL);
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inline bool SkUnichar_IsVariationSelector(SkUnichar uni) {
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/* The 'true' ranges are:
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* 0x180B <= uni <= 0x180D
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* 0xFE00 <= uni <= 0xFE0F
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* 0xE0100 <= uni <= 0xE01EF
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*/
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if (uni < 0x180B || uni > 0xE01EF) {
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return false;
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}
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if ((uni > 0x180D && uni < 0xFE00) || (uni > 0xFE0F && uni < 0xE0100)) {
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return false;
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}
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return true;
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}
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///////////////////////////////////////////////////////////////////////////////
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class SkAutoTrace {
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public:
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/** NOTE: label contents are not copied, just the ptr is
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retained, so DON'T DELETE IT.
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*/
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SkAutoTrace(const char label[]) : fLabel(label) {
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SkDebugf("--- trace: %s Enter\n", fLabel);
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}
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~SkAutoTrace() {
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SkDebugf("--- trace: %s Leave\n", fLabel);
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}
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private:
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const char* fLabel;
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};
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#define SkAutoTrace(...) SK_REQUIRE_LOCAL_VAR(SkAutoTrace)
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#endif
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