diff options
Diffstat (limited to 'absl/strings/numbers.h')
| -rw-r--r-- | absl/strings/numbers.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/absl/strings/numbers.h b/absl/strings/numbers.h index 745de67..9b8ec89 100644 --- a/absl/strings/numbers.h +++ b/absl/strings/numbers.h @@ -37,7 +37,14 @@ #include <type_traits> #include "absl/base/internal/bits.h" +#ifdef __SSE4_2__ +// TODO(jorg): Remove this when we figure out the right way +// to swap bytes on SSE 4.2 that works with the compilers +// we claim to support. Also, add tests for the compiler +// that doesn't support the Intel _bswap64 intrinsic but +// does support all the SSE 4.2 intrinsics #include "absl/base/internal/endian.h" +#endif #include "absl/base/macros.h" #include "absl/base/port.h" #include "absl/numeric/int128.h" @@ -189,12 +196,12 @@ ABSL_MUST_USE_RESULT bool safe_strtoi_base(absl::string_view s, int_type* out, // Returns the number of non-pad digits of the output (it can never be zero // since 0 has one digit). inline size_t FastHexToBufferZeroPad16(uint64_t val, char* out) { - uint64_t be = absl::big_endian::FromHost64(val); #ifdef __SSE4_2__ + uint64_t be = absl::big_endian::FromHost64(val); const auto kNibbleMask = _mm_set1_epi8(0xf); const auto kHexDigits = _mm_setr_epi8('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'); - auto v = _mm_loadu_si64(reinterpret_cast<__m128i*>(&be)); // load lo dword + auto v = _mm_loadl_epi64(reinterpret_cast<__m128i*>(&be)); // load lo dword auto v4 = _mm_srli_epi64(v, 4); // shift 4 right auto il = _mm_unpacklo_epi8(v4, v); // interleave bytes auto m = _mm_and_si128(il, kNibbleMask); // mask out nibbles @@ -202,7 +209,7 @@ inline size_t FastHexToBufferZeroPad16(uint64_t val, char* out) { _mm_storeu_si128(reinterpret_cast<__m128i*>(out), hexchars); #else for (int i = 0; i < 8; ++i) { - auto byte = (be >> (8 * i)) & 0xFF; + auto byte = (val >> (56 - 8 * i)) & 0xFF; auto* hex = &absl::numbers_internal::kHexTable[byte * 2]; std::memcpy(out + 2 * i, hex, 2); } |