diff options
| -rw-r--r-- | absl/crc/internal/crc32_x86_arm_combined_simd.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/absl/crc/internal/crc32_x86_arm_combined_simd.h b/absl/crc/internal/crc32_x86_arm_combined_simd.h index f23cd75e..344042d8 100644 --- a/absl/crc/internal/crc32_x86_arm_combined_simd.h +++ b/absl/crc/internal/crc32_x86_arm_combined_simd.h @@ -25,8 +25,10 @@ // We define a translation layer for both x86 and ARM for the ease of use and // most performance gains. -// We need CRC (part of SSE 4.2) and PCLMULQDQ instructions. -#if defined(__SSE4_2__) && defined(__PCLMUL__) +// This implementation requires 64-bit CRC instructions (part of SSE 4.2) and +// PCLMULQDQ instructions. 32-bit builds with SSE 4.2 do exist, so the +// __x86_64__ condition is necessary. +#if defined(__x86_64__) && defined(__SSE4_2__) && defined(__PCLMUL__) #include <x86intrin.h> #define ABSL_CRC_INTERNAL_HAVE_X86_SIMD |