Update brotli to v1.0.0-snapshot.

third_party/brotli/dec/port.h

 /* Copyright 2015 Google Inc. All Rights Reserved.
 
    Distributed under MIT license.
    See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
 */
 
 /* Macros for compiler / platform specific features and build options.
 
    Build options are:
     * BROTLI_BUILD_32_BIT disables 64-bit optimizations
     * BROTLI_BUILD_64_BIT forces to use 64-bit optimizations
     * BROTLI_BUILD_BIG_ENDIAN forces to use big-endian optimizations
     * BROTLI_BUILD_ENDIAN_NEUTRAL disables endian-aware optimizations
     * BROTLI_BUILD_LITTLE_ENDIAN forces to use little-endian optimizations
     * BROTLI_BUILD_MODERN_COMPILER forces to use modern compilers built-ins,
       features and attributes
     * BROTLI_BUILD_PORTABLE disables dangerous optimizations, like unaligned
       read and overlapping memcpy; this reduces decompression speed by 5%
+    * BROTLI_BUILD_NO_RBIT disables "rbit" optimization for ARM CPUs
     * BROTLI_DEBUG dumps file name and line number when decoder detects stream
       or memory error
     * BROTLI_ENABLE_LOG enables asserts and dumps various state information
  */
 
 #ifndef BROTLI_DEC_PORT_H_
 #define BROTLI_DEC_PORT_H_
 
 #if defined(BROTLI_ENABLE_LOG) || defined(BROTLI_DEBUG)
 #include <assert.h>
 #include <stdio.h>
 #endif
 
-/* Compatibility with non-clang compilers. */
-#ifndef __has_builtin
-#define __has_builtin(x) 0
-#endif
-
-#ifndef __has_attribute
-#define __has_attribute(x) 0
-#endif
-
-#ifndef __has_feature
-#define __has_feature(x) 0
-#endif
+#include <brotli/port.h>
 
 #if defined(__arm__) || defined(__thumb__) || \
-    defined(_M_ARM) || defined(_M_ARMT)
+    defined(_M_ARM) || defined(_M_ARMT) || defined(__ARM64_ARCH_8__)
 #define BROTLI_TARGET_ARM
-#if (defined(__ARM_ARCH) && (__ARM_ARCH >= 7)) || \
-    (defined(M_ARM) && (M_ARM >= 7))
+#if (defined(__ARM_ARCH) && (__ARM_ARCH == 7)) || \
+    (defined(M_ARM) && (M_ARM == 7))
 #define BROTLI_TARGET_ARMV7
 #endif  /* ARMv7 */
-#if defined(__aarch64__)
+#if defined(__aarch64__) || defined(__ARM64_ARCH_8__)
 #define BROTLI_TARGET_ARMV8
 #endif  /* ARMv8 */
 #endif  /* ARM */
 
 #if defined(__i386) || defined(_M_IX86)
 #define BROTLI_TARGET_X86
 #endif
 
 #if defined(__x86_64__) || defined(_M_X64)
 #define BROTLI_TARGET_X64
 #endif
 
 #if defined(__PPC64__)
 #define BROTLI_TARGET_POWERPC64
 #endif
 
-#if defined(__GNUC__) && defined(__GNUC_MINOR__)
-#define BROTLI_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
-#else
-#define BROTLI_GCC_VERSION 0
-#endif
-
-#if defined(__ICC)
-#define BROTLI_ICC_VERSION __ICC
-#else
-#define BROTLI_ICC_VERSION 0
-#endif
-
-#if defined(BROTLI_BUILD_MODERN_COMPILER)
-#define BROTLI_MODERN_COMPILER 1
-#elif (BROTLI_GCC_VERSION > 300) || (BROTLI_ICC_VERSION >= 1600)
-#define BROTLI_MODERN_COMPILER 1
-#else
-#define BROTLI_MODERN_COMPILER 0
-#endif
-
 #ifdef BROTLI_BUILD_PORTABLE
 #define BROTLI_ALIGNED_READ (!!1)
 #elif defined(BROTLI_TARGET_X86) || defined(BROTLI_TARGET_X64) || \
      defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8)
-/* Allow unaligned read only for whitelisted CPUs. */
+/* Allow unaligned read only for white-listed CPUs. */
 #define BROTLI_ALIGNED_READ (!!0)
 #else
 #define BROTLI_ALIGNED_READ (!!1)
 #endif
 
-/* Define "PREDICT_TRUE" and "PREDICT_FALSE" macros for capable compilers.
-
-To apply compiler hint, enclose the branching condition into macros, like this:
-
-  if (PREDICT_TRUE(zero == 0)) {
-    // main execution path
-  } else {
-    // compiler should place this code outside of main execution path
-  }
-
-OR:
-
-  if (PREDICT_FALSE(something_rare_or_unexpected_happens)) {
-    // compiler should place this code outside of main execution path
-  }
-
-*/
-#if BROTLI_MODERN_COMPILER || __has_builtin(__builtin_expect)
-#define PREDICT_TRUE(x) (__builtin_expect(!!(x), 1))
-#define PREDICT_FALSE(x) (__builtin_expect(x, 0))
-#else
-#define PREDICT_FALSE(x) (x)
-#define PREDICT_TRUE(x) (x)
-#endif
-
 /* IS_CONSTANT macros returns true for compile-time constant expressions. */
 #if BROTLI_MODERN_COMPILER || __has_builtin(__builtin_constant_p)
 #define IS_CONSTANT(x) (!!__builtin_constant_p(x))
 #else
 #define IS_CONSTANT(x) (!!0)
 #endif
 
-#if BROTLI_MODERN_COMPILER || __has_attribute(always_inline)
-#define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((always_inline))
-#else
-#define ATTRIBUTE_ALWAYS_INLINE
-#endif
-
-#if BROTLI_MODERN_COMPILER || __has_attribute(visibility)
-#define ATTRIBUTE_VISIBILITY_HIDDEN __attribute__ ((visibility ("hidden")))
-#else
-#define ATTRIBUTE_VISIBILITY_HIDDEN
-#endif
-
-#ifndef BROTLI_INTERNAL
-#define BROTLI_INTERNAL ATTRIBUTE_VISIBILITY_HIDDEN
-#endif
-
-#ifndef _MSC_VER
-#if defined(__cplusplus) || !defined(__STRICT_ANSI__) || \
-    __STDC_VERSION__ >= 199901L
-#define BROTLI_INLINE inline ATTRIBUTE_ALWAYS_INLINE
-#else
-#define BROTLI_INLINE
-#endif
-#else  /* _MSC_VER */
-#define BROTLI_INLINE __forceinline
-#endif  /* _MSC_VER */
-
 #ifdef BROTLI_ENABLE_LOG
 #define BROTLI_DCHECK(x) assert(x)
 #define BROTLI_LOG(x) printf x
 #else
 #define BROTLI_DCHECK(x)
 #define BROTLI_LOG(x)
 #endif
 
 #if defined(BROTLI_DEBUG) || defined(BROTLI_ENABLE_LOG)
-static inline void BrotliDump(const char* f, int l, const char* fn) {
+static BROTLI_INLINE void BrotliDump(const char* f, int l, const char* fn) {
   fprintf(stderr, "%s:%d (%s)\n", f, l, fn);
   fflush(stderr);
 }
 #define BROTLI_DUMP() BrotliDump(__FILE__, __LINE__, __FUNCTION__)
 #else
 #define BROTLI_DUMP() (void)(0)
 #endif
 
 #if defined(BROTLI_BUILD_64_BIT)
 #define BROTLI_64_BITS 1
 #elif defined(BROTLI_BUILD_32_BIT)
 #define BROTLI_64_BITS 0
 #elif defined(BROTLI_TARGET_X64) || defined(BROTLI_TARGET_ARMV8) || \
     defined(BROTLI_TARGET_POWERPC64)
 #define BROTLI_64_BITS 1
 #else
 #define BROTLI_64_BITS 0
 #endif
 
+#if (BROTLI_64_BITS)
+#define reg_t uint64_t
+#else
+#define reg_t uint32_t
+#endif
+
 #if defined(BROTLI_BUILD_BIG_ENDIAN)
 #define BROTLI_LITTLE_ENDIAN 0
 #define BROTLI_BIG_ENDIAN 1
 #elif defined(BROTLI_BUILD_LITTLE_ENDIAN)
 #define BROTLI_LITTLE_ENDIAN 1
 #define BROTLI_BIG_ENDIAN 0
 #elif defined(BROTLI_BUILD_ENDIAN_NEUTRAL)
 #define BROTLI_LITTLE_ENDIAN 0
 #define BROTLI_BIG_ENDIAN 0
 #elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
 #define BROTLI_LITTLE_ENDIAN 1
 #define BROTLI_BIG_ENDIAN 0
 #elif defined(_WIN32)
 /* Win32 can currently always be assumed to be little endian */
 #define BROTLI_LITTLE_ENDIAN 1
 #define BROTLI_BIG_ENDIAN 0
 #else
 #if (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))
 #define BROTLI_BIG_ENDIAN 1
 #else
 #define BROTLI_BIG_ENDIAN 0
 #endif
 #define BROTLI_LITTLE_ENDIAN 0
 #endif
 
-#if BROTLI_MODERN_COMPILER || __has_attribute(noinline)
-#define BROTLI_NOINLINE __attribute__((noinline))
-#else
-#define BROTLI_NOINLINE
-#endif
-
 #define BROTLI_REPEAT(N, X) {     \
   if ((N & 1) != 0) {X;}          \
   if ((N & 2) != 0) {X; X;}       \
   if ((N & 4) != 0) {X; X; X; X;} \
 }
 
-#if BROTLI_MODERN_COMPILER || defined(__llvm__)
-#if defined(BROTLI_TARGET_ARMV7)
-static BROTLI_INLINE unsigned BrotliRBit(unsigned input) {
-  unsigned output;
+#if (BROTLI_MODERN_COMPILER || defined(__llvm__)) && \
+    !defined(BROTLI_BUILD_NO_RBIT)
+#if defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8)
+/* TODO: detect ARMv6T2 and enable this code for it. */
+static BROTLI_INLINE reg_t BrotliRBit(reg_t input) {
+  reg_t output;
   __asm__("rbit %0, %1\n" : "=r"(output) : "r"(input));
   return output;
 }
 #define BROTLI_RBIT(x) BrotliRBit(x)
 #endif  /* armv7 */
 #endif  /* gcc || clang */
 
 #if defined(BROTLI_TARGET_ARM)
 #define BROTLI_HAS_UBFX (!!1)
 #else
 #define BROTLI_HAS_UBFX (!!0)
 #endif
 
 #define BROTLI_ALLOC(S, L) S->alloc_func(S->memory_manager_opaque, L)
 
 #define BROTLI_FREE(S, X) {                  \
   S->free_func(S->memory_manager_opaque, X); \
   X = NULL;                                  \
 }
 
-#define BROTLI_UNUSED(X) (void)(X)
-
 #endif  /* BROTLI_DEC_PORT_H_ */