3d096654b9
I spent some time looking at perf.skia.org and it looks like we can do better. It is weird, weird, weird that on x86, we see three completely different behaviors: - x86 Android: inlining better for small N, custom better for large N; - Windows: inlining better for large N, custom better for small N; - other x86: inlining generally better BUG=skia:4316,chromium:516426 Committed: https://skia.googlesource.com/skia/+/b68fa409fc00ce2f38e2a0fd6f9dc2379b372481 Summaries: https://perf.skia.org/#4179 All traces, log scale: https://perf.skia.org/#4180 TBR=reed@google.com No public API changes. Review URL: https://codereview.chromium.org/1357193002
142 lines
4.8 KiB
C++
142 lines
4.8 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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namespace SkOpts {
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extern void (*memset16)(uint16_t[], uint16_t, int);
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extern void (*memset32)(uint32_t[], uint32_t, int);
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}
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///////////////////////////////////////////////////////////////////////////////
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// Inlining heuristics were determined by using perf.skia.org and bench/MemsetBench.cpp.
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// When using MSVC, inline is better >= 1K and worse <= 100. The Nexus Player was the opposite.
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// Otherwise, when NEON or SSE is available to GCC or Clang, they can handle it best.
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// See https://code.google.com/p/chromium/issues/detail?id=516426#c15 for more details.
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// See also skia:4316; it might be a good idea to use rep stosw/stosd here.
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#define INLINE_IF(cond) if (cond) { while (count --> 0) { *buffer++ = value; } return; }
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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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static inline void sk_memset16(uint16_t buffer[], uint16_t value, int count) {
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#if defined(_MSC_VER)
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INLINE_IF(count > 300)
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#elif defined(SK_BUILD_FOR_ANDROID) && defined(SK_CPU_X86)
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INLINE_IF(count < 300)
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#elif defined(SK_ARM_HAS_NEON) || SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
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INLINE_IF(true)
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#else
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INLINE_IF(count <= 10)
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#endif
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SkOpts::memset16(buffer, value, count);
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}
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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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static inline void sk_memset32(uint32_t buffer[], uint32_t value, int count) {
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#if defined(_MSC_VER)
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INLINE_IF(count > 300)
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#elif defined(SK_BUILD_FOR_ANDROID) && defined(SK_CPU_X86)
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INLINE_IF(count < 300)
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#elif defined(SK_ARM_HAS_NEON) || SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
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INLINE_IF(true)
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#else
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INLINE_IF(count <= 10)
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#endif
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SkOpts::memset32(buffer, value, count);
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}
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#undef INLINE_IF
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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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