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skia2/include/core/SkPreConfig.h
mtklein 5141d90796 Add build targets for advanced Intel instruction sets (1 of 3). 
CL (1 of 3) adds empty lists in our .gypi,
and builds the files in those empty lists with the appropriate flags.

CL (2 of 3) will have Chrome's GYP and GN files read these lists,
and build them with the appropriate flags.

CL (3 of 3) will add runtime detection and stub files to the lists
with empty Init_sse42(), Init_avx(), Init_avx2() methods.

After that, we should be able to use SSE 4.2, AVX, and AVX2 if desired.

Some motivation:
  - SSE 4.2 adds some sweet string-oriented methods that
    can help us write fast high quality 32-bit hashes.
  - AVX is SSE doubled, e.g. 8 floats or two SkPMFloat at a time.
  - AVX2 is SSE2 doubled, e.g. 8 pixels at a time.

BUG=skia:4117

Review URL: https://codereview.chromium.org/1290423007
2015-08-24 10:32:02 -07:00

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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
// IWYU pragma: private, include "SkTypes.h"
#ifndef SkPreConfig_DEFINED
#define SkPreConfig_DEFINED
// Allows embedders that want to disable macros that take arguments to just
// define that symbol to be one of these
#define SK_NOTHING_ARG1(arg1)
#define SK_NOTHING_ARG2(arg1, arg2)
#define SK_NOTHING_ARG3(arg1, arg2, arg3)
//////////////////////////////////////////////////////////////////////
#if !defined(SK_BUILD_FOR_ANDROID) && !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_WIN32) && !defined(SK_BUILD_FOR_UNIX) && !defined(SK_BUILD_FOR_MAC)
#ifdef __APPLE__
#include "TargetConditionals.h"
#endif
#if defined(WIN32) || defined(__SYMBIAN32__)
#define SK_BUILD_FOR_WIN32
#elif defined(ANDROID)
#define SK_BUILD_FOR_ANDROID
#elif defined(linux) || defined(__FreeBSD__) || defined(__OpenBSD__) || \
defined(__sun) || defined(__NetBSD__) || defined(__DragonFly__) || \
defined(__GLIBC__) || defined(__GNU__)
#define SK_BUILD_FOR_UNIX
#elif TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
#define SK_BUILD_FOR_IOS
#else
#define SK_BUILD_FOR_MAC
#endif
#endif
/* Even if the user only defined the framework variant we still need to build
* the default (NDK-compliant) Android code. Therefore, when attempting to
* include/exclude something from the framework variant check first that we are
* building for Android then check the status of the framework define.
*/
#if defined(SK_BUILD_FOR_ANDROID_FRAMEWORK) && !defined(SK_BUILD_FOR_ANDROID)
#define SK_BUILD_FOR_ANDROID
#endif
//////////////////////////////////////////////////////////////////////
#if !defined(SK_DEBUG) && !defined(SK_RELEASE)
#ifdef NDEBUG
#define SK_RELEASE
#else
#define SK_DEBUG
#endif
#endif
#ifdef SK_BUILD_FOR_WIN32
#if !defined(SK_RESTRICT)
#define SK_RESTRICT __restrict
#endif
#if !defined(SK_WARN_UNUSED_RESULT)
#define SK_WARN_UNUSED_RESULT
#endif
#endif
//////////////////////////////////////////////////////////////////////
#if !defined(SK_RESTRICT)
#define SK_RESTRICT __restrict__
#endif
#if !defined(SK_WARN_UNUSED_RESULT)
#define SK_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
#endif
//////////////////////////////////////////////////////////////////////
#if !defined(SK_CPU_BENDIAN) && !defined(SK_CPU_LENDIAN)
#if defined(__sparc) || defined(__sparc__) || \
defined(_POWER) || defined(__powerpc__) || \
defined(__ppc__) || defined(__hppa) || \
defined(__PPC__) || defined(__PPC64__) || \
defined(_MIPSEB) || defined(__ARMEB__) || \
defined(__s390__) || \
(defined(__sh__) && defined(__BIG_ENDIAN__)) || \
(defined(__ia64) && defined(__BIG_ENDIAN__))
#define SK_CPU_BENDIAN
#else
#define SK_CPU_LENDIAN
#endif
#endif
//////////////////////////////////////////////////////////////////////
#if defined(__i386) || defined(_M_IX86) || defined(__x86_64__) || defined(_M_X64)
#define SK_CPU_X86 1
#endif
/**
* SK_CPU_SSE_LEVEL
*
* If defined, SK_CPU_SSE_LEVEL should be set to the highest supported level.
* On non-intel CPU this should be undefined.
*/
#define SK_CPU_SSE_LEVEL_SSE1 10
#define SK_CPU_SSE_LEVEL_SSE2 20
#define SK_CPU_SSE_LEVEL_SSE3 30
#define SK_CPU_SSE_LEVEL_SSSE3 31
#define SK_CPU_SSE_LEVEL_SSE41 41
#define SK_CPU_SSE_LEVEL_SSE42 42
#define SK_CPU_SSE_LEVEL_AVX 51
#define SK_CPU_SSE_LEVEL_AVX2 52
// Are we in GCC?
#ifndef SK_CPU_SSE_LEVEL
// These checks must be done in descending order to ensure we set the highest
// available SSE level.
#if defined(__AVX2__)
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_AVX2
#elif defined(__AVX__)
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_AVX
#elif defined(__SSE4_2__)
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE42
#elif defined(__SSE4_1__)
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE41
#elif defined(__SSSE3__)
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSSE3
#elif defined(__SSE3__)
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE3
#elif defined(__SSE2__)
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE2
#endif
#endif
// Are we in VisualStudio?
#ifndef SK_CPU_SSE_LEVEL
// These checks must be done in descending order to ensure we set the highest
// available SSE level. 64-bit intel guarantees at least SSE2 support.
#if defined(__AVX2__)
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_AVX2
#elif defined(__AVX__)
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_AVX
#elif defined(_M_X64) || defined(_M_AMD64)
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE2
#elif defined(_M_IX86_FP)
#if _M_IX86_FP >= 2
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE2
#elif _M_IX86_FP == 1
#define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE1
#endif
#endif
#endif
//////////////////////////////////////////////////////////////////////
// ARM defines
#if defined(__arm__) && (!defined(__APPLE__) || !TARGET_IPHONE_SIMULATOR)
#define SK_CPU_ARM32
#if defined(__GNUC__)
#if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
|| defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \
|| defined(__ARM_ARCH_7EM__) || defined(_ARM_ARCH_7)
#define SK_ARM_ARCH 7
#elif defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
|| defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \
|| defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) \
|| defined(__ARM_ARCH_6M__) || defined(_ARM_ARCH_6)
#define SK_ARM_ARCH 6
#elif defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) \
|| defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) \
|| defined(__ARM_ARCH_5TEJ__) || defined(_ARM_ARCH_5)
#define SK_ARM_ARCH 5
#elif defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) || defined(_ARM_ARCH_4)
#define SK_ARM_ARCH 4
#else
#define SK_ARM_ARCH 3
#endif
#endif
#endif
// Disable ARM64 optimizations for iOS due to complications regarding gyp and iOS.
#if defined(__aarch64__) && !defined(SK_BUILD_FOR_IOS)
#define SK_CPU_ARM64
#endif
// All 64-bit ARM chips have NEON. Many 32-bit ARM chips do too.
// TODO: Why don't we want NEON on iOS?
#if !defined(SK_ARM_HAS_NEON) && !defined(SK_BUILD_FOR_IOS) && defined(__ARM_NEON)
#define SK_ARM_HAS_NEON
#endif
//////////////////////////////////////////////////////////////////////
#if !defined(SKIA_IMPLEMENTATION)
#define SKIA_IMPLEMENTATION 0
#endif
#if defined(SKIA_DLL)
#if defined(WIN32)
#if SKIA_IMPLEMENTATION
#define SK_API __declspec(dllexport)
#else
#define SK_API __declspec(dllimport)
#endif
#else
#define SK_API __attribute__((visibility("default")))
#endif
#else
#define SK_API
#endif
//////////////////////////////////////////////////////////////////////
/**
* Use SK_PURE_FUNC as an attribute to indicate that a function's
* return value only depends on the value of its parameters. This
* can help the compiler optimize out successive calls.
*
* Usage:
* void function(int params) SK_PURE_FUNC;
*/
#if defined(__GNUC__)
# define SK_PURE_FUNC __attribute__((pure))
#else
# define SK_PURE_FUNC /* nothing */
#endif
//////////////////////////////////////////////////////////////////////
/**
* SK_HAS_ATTRIBUTE(<name>) should return true iff the compiler
* supports __attribute__((<name>)). Mostly important because
* Clang doesn't support all of GCC attributes.
*/
#if defined(__has_attribute)
# define SK_HAS_ATTRIBUTE(x) __has_attribute(x)
#elif defined(__GNUC__)
# define SK_HAS_ATTRIBUTE(x) 1
#else
# define SK_HAS_ATTRIBUTE(x) 0
#endif
/**
* SK_ATTRIBUTE_OPTIMIZE_O1 can be used as a function attribute
* to specify individual optimization level of -O1, if the compiler
* supports it.
*
* NOTE: Clang/ARM (r161757) does not support the 'optimize' attribute.
*/
#if SK_HAS_ATTRIBUTE(optimize)
# define SK_ATTRIBUTE_OPTIMIZE_O1 __attribute__((optimize("O1")))
#else
# define SK_ATTRIBUTE_OPTIMIZE_O1 /* nothing */
#endif
#endif
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