Remove unused CRC function.

PiperOrigin-RevId: 684650501

.bazelrc

@@ -28,9 +28,6 @@ build --cxxopt=-Wno-c++20-extensions
 # --host_cxxopt flag (https://bazel.build/docs/user-manual#host-cxxopt).
 build --host_cxxopt=-std=c++17
 
-# Use the builtin crc32 for fast integer hashing.
-build:linux --copt=-mcrc32
-
 # Build GoogleTest with ABSL support.
 build --define absl=1
 

centipede/int_utils.h

@@ -28,20 +28,6 @@ inline uint64_t Hash64Bits(uint64_t bits) {
   return bits * kPrime;
 }
 
-// Accumulates the 32-bit CRC for `previous` with `input`.
-inline uint32_t CRC32(uint32_t previous, uint32_t input) {
-#if __ARM_FEATURE_CRC32
-  return __builtin_arm_crc32w(previous, input);
-#else
-  return __builtin_ia32_crc32si(previous, input);
-#endif
-}
-
-// Returns `bits` rotated left by `n`.
-inline uint64_t RotateLeft(uint64_t bits, uint64_t n) {
-  return (bits << n) | (bits >> (64 - n));
-}
-
 }  // namespace centipede
 
 #endif  // THIRD_PARTY_CENTIPEDE_INT_UTILS_H_

doc/quickstart-bazel.md

@@ -101,9 +101,6 @@ build --action_env=CXX=clang++
 # Use the C++17 standard.
 build --cxxopt=-std=c++17
 
-# Use the builtin crc32 for fast integer hashing.
-build --copt=-mcrc32
-
 # Show everything when running tests.
 test --test_output=streamed