| //===-- Elementary operations for aarch64 --------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIBC_SRC_STRING_MEMORY_UTILS_ELEMENTS_AARCH64_H |
| #define LLVM_LIBC_SRC_STRING_MEMORY_UTILS_ELEMENTS_AARCH64_H |
| |
| #include <src/string/memory_utils/elements.h> |
| #include <stddef.h> // size_t |
| #include <stdint.h> // uint8_t, uint16_t, uint32_t, uint64_t |
| |
| #ifdef __ARM_NEON |
| #include <arm_neon.h> |
| #endif |
| |
| namespace __llvm_libc { |
| namespace aarch64 { |
| |
| using _1 = __llvm_libc::scalar::_1; |
| using _2 = __llvm_libc::scalar::_2; |
| using _3 = __llvm_libc::scalar::_3; |
| using _4 = __llvm_libc::scalar::_4; |
| using _8 = __llvm_libc::scalar::_8; |
| using _16 = __llvm_libc::scalar::_16; |
| |
| #ifdef __ARM_NEON |
| struct N32 { |
| static constexpr size_t kSize = 32; |
| static bool Equals(const char *lhs, const char *rhs) { |
| uint8x16_t l_0 = vld1q_u8((const uint8_t *)lhs); |
| uint8x16_t r_0 = vld1q_u8((const uint8_t *)rhs); |
| uint8x16_t l_1 = vld1q_u8((const uint8_t *)(lhs + 16)); |
| uint8x16_t r_1 = vld1q_u8((const uint8_t *)(rhs + 16)); |
| uint8x16_t temp = vpmaxq_u8(veorq_u8(l_0, r_0), veorq_u8(l_1, r_1)); |
| uint64_t res = |
| vgetq_lane_u64(vreinterpretq_u64_u8(vpmaxq_u8(temp, temp)), 0); |
| return res == 0; |
| } |
| static int ThreeWayCompare(const char *lhs, const char *rhs) { |
| uint8x16_t l_0 = vld1q_u8((const uint8_t *)lhs); |
| uint8x16_t r_0 = vld1q_u8((const uint8_t *)rhs); |
| uint8x16_t l_1 = vld1q_u8((const uint8_t *)(lhs + 16)); |
| uint8x16_t r_1 = vld1q_u8((const uint8_t *)(rhs + 16)); |
| uint8x16_t temp = vpmaxq_u8(veorq_u8(l_0, r_0), veorq_u8(l_1, r_1)); |
| uint64_t res = |
| vgetq_lane_u64(vreinterpretq_u64_u8(vpmaxq_u8(temp, temp)), 0); |
| if (res == 0) |
| return 0; |
| size_t index = (__builtin_ctzl(res) >> 3) << 2; |
| uint32_t l = *((const uint32_t *)(lhs + index)); |
| uint32_t r = *((const uint32_t *)(rhs + index)); |
| return __llvm_libc::scalar::_4::ScalarThreeWayCompare(l, r); |
| } |
| }; |
| |
| using _32 = N32; |
| #else |
| using _32 = __llvm_libc::scalar::_32; |
| #endif // __ARM_NEON |
| |
| } // namespace aarch64 |
| } // namespace __llvm_libc |
| |
| #endif // LLVM_LIBC_SRC_STRING_MEMORY_UTILS_ELEMENTS_AARCH64_H |