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Move TZCNT and BSR intrinsics to platform.h, add MSVC versions (#636)
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@ -41,6 +41,10 @@
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#define BROTLI_X_BIG_ENDIAN BIG_ENDIAN
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#endif
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#if BROTLI_MSVC_VERSION_CHECK(12, 0, 0)
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#include <intrin.h>
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#endif
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#if defined(BROTLI_ENABLE_LOG) || defined(BROTLI_DEBUG)
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#include <assert.h>
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#include <stdio.h>
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@ -522,6 +526,36 @@ BROTLI_MIN_MAX(size_t) BROTLI_MIN_MAX(uint32_t) BROTLI_MIN_MAX(uint8_t)
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(A)[(J)] = __brotli_swap_tmp; \
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}
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#if BROTLI_64_BITS
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#if BROTLI_GNUC_HAS_BUILTIN(__builtin_ctzll, 3, 4, 0) || \
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BROTLI_INTEL_VERSION_CHECK(16, 0, 0)
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#define BROTLI_TZCNT64 __builtin_ctzll
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#elif BROTLI_MSVC_VERSION_CHECK(12, 0, 0)
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#if defined(BROTLI_TARGET_X64)
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#define BROTLI_TZCNT64 _tzcnt_u64
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#else /* BROTLI_TARGET_X64 */
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static BROTLI_INLINE uint32_t BrotliBsf64Msvc(uint64_t x) {
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uint32_t lsb;
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_BitScanForward64(&lsb, x);
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return lsb;
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}
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#define BROTLI_TZCNT64 BrotliBsf64Msvc
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#endif /* BROTLI_TARGET_X64 */
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#endif /* __builtin_ctzll */
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#endif /* BROTLI_64_BITS */
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#if BROTLI_GNUC_HAS_BUILTIN(__builtin_clz, 3, 4, 0) || \
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BROTLI_INTEL_VERSION_CHECK(16, 0, 0)
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#define BROTLI_BSR32(x) (31u ^ (uint32_t)__builtin_clz(x))
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#elif BROTLI_MSVC_VERSION_CHECK(12, 0, 0)
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static BROTLI_INLINE uint32_t BrotliBsr32Msvc(uint32_t x) {
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uint32_t msb;
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_BitScanReverse(&msb, x);
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return msb;
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}
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#define BROTLI_BSR32 BrotliBsr32Msvc
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#endif /* __builtin_clz */
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/* Default brotli_alloc_func */
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static void* BrotliDefaultAllocFunc(void* opaque, size_t size) {
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BROTLI_UNUSED(opaque);
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@ -19,10 +19,8 @@ extern "C" {
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#endif
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static BROTLI_INLINE uint32_t Log2FloorNonZero(size_t n) {
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/* TODO: generalize and move to platform.h */
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#if BROTLI_GNUC_HAS_BUILTIN(__builtin_clz, 3, 4, 0) || \
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BROTLI_INTEL_VERSION_CHECK(16, 0, 0)
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return 31u ^ (uint32_t)__builtin_clz((uint32_t)n);
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#if defined(BROTLI_BSR32)
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return BROTLI_BSR32((uint32_t)n);
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#else
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uint32_t result = 0;
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while (n >>= 1) result++;
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@ -17,8 +17,7 @@ extern "C" {
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#endif
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/* Separate implementation for little-endian 64-bit targets, for speed. */
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#if defined(__GNUC__) && defined(_LP64) && defined(BROTLI_LITTLE_ENDIAN)
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#if defined(BROTLI_TZCNT64) && BROTLI_64_BITS && BROTLI_LITTLE_ENDIAN
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static BROTLI_INLINE size_t FindMatchLengthWithLimit(const uint8_t* s1,
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const uint8_t* s2,
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size_t limit) {
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@ -32,7 +31,7 @@ static BROTLI_INLINE size_t FindMatchLengthWithLimit(const uint8_t* s1,
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} else {
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uint64_t x = BROTLI_UNALIGNED_LOAD64LE(s2) ^
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BROTLI_UNALIGNED_LOAD64LE(s1 + matched);
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size_t matching_bits = (size_t)__builtin_ctzll(x);
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size_t matching_bits = (size_t)BROTLI_TZCNT64(x);
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matched += matching_bits >> 3;
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return matched;
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}
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