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| 1 | //===-- Memcmp implementation for x86_64 ------------------------*- C++ -*-===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef LLVM_LIBC_SRC_STRING_MEMORY_UTILS_X86_64_INLINE_MEMCMP_H |
| 10 | #define LLVM_LIBC_SRC_STRING_MEMORY_UTILS_X86_64_INLINE_MEMCMP_H |
| 11 | |
| 12 | #include "src/__support/macros/attributes.h" // LIBC_INLINE |
| 13 | #include "src/__support/macros/optimization.h" // LIBC_UNLIKELY |
| 14 | #include "src/string/memory_utils/op_generic.h" |
| 15 | #include "src/string/memory_utils/op_x86.h" |
| 16 | #include "src/string/memory_utils/utils.h" // MemcmpReturnType |
| 17 | |
| 18 | namespace LIBC_NAMESPACE_DECL { |
| 19 | |
| 20 | [[maybe_unused]] LIBC_INLINE MemcmpReturnType |
| 21 | inline_memcmp_generic_gt16(CPtr p1, CPtr p2, size_t count) { |
| 22 | return generic::Memcmp<uint64_t>::loop_and_tail_align_above(384, p1, p2, |
| 23 | count); |
| 24 | } |
| 25 | |
| 26 | #if defined(__SSE4_1__) |
| 27 | [[maybe_unused]] LIBC_INLINE MemcmpReturnType |
| 28 | inline_memcmp_x86_sse41_gt16(CPtr p1, CPtr p2, size_t count) { |
| 29 | return generic::Memcmp<__m128i>::loop_and_tail_align_above(384, p1, p2, |
| 30 | count); |
| 31 | } |
| 32 | #endif // __SSE4_1__ |
| 33 | |
| 34 | #if defined(__AVX2__) |
| 35 | [[maybe_unused]] LIBC_INLINE MemcmpReturnType |
| 36 | inline_memcmp_x86_avx2_gt16(CPtr p1, CPtr p2, size_t count) { |
| 37 | if (count <= 32) |
| 38 | return generic::Memcmp<__m128i>::head_tail(p1, p2, count); |
| 39 | if (count <= 64) |
| 40 | return generic::Memcmp<__m256i>::head_tail(p1, p2, count); |
| 41 | return generic::Memcmp<__m256i>::loop_and_tail_align_above(384, p1, p2, |
| 42 | count); |
| 43 | } |
| 44 | #endif // __AVX2__ |
| 45 | |
| 46 | #if defined(__AVX512BW__) |
| 47 | [[maybe_unused]] LIBC_INLINE MemcmpReturnType |
| 48 | inline_memcmp_x86_avx512bw_gt16(CPtr p1, CPtr p2, size_t count) { |
| 49 | if (count <= 32) |
| 50 | return generic::Memcmp<__m128i>::head_tail(p1, p2, count); |
| 51 | if (count <= 64) |
| 52 | return generic::Memcmp<__m256i>::head_tail(p1, p2, count); |
| 53 | if (count <= 128) |
| 54 | return generic::Memcmp<__m512i>::head_tail(p1, p2, count); |
| 55 | return generic::Memcmp<__m512i>::loop_and_tail_align_above(384, p1, p2, |
| 56 | count); |
| 57 | } |
| 58 | #endif // __AVX512BW__ |
| 59 | |
| 60 | LIBC_INLINE MemcmpReturnType inline_memcmp_x86(CPtr p1, CPtr p2, size_t count) { |
| 61 | if (count == 0) |
| 62 | return MemcmpReturnType::zero(); |
| 63 | if (count == 1) |
| 64 | return generic::Memcmp<uint8_t>::block(p1, p2); |
| 65 | if (count == 2) |
| 66 | return generic::Memcmp<uint16_t>::block(p1, p2); |
| 67 | if (count == 3) |
| 68 | return generic::MemcmpSequence<uint16_t, uint8_t>::block(p1, p2); |
| 69 | if (count == 4) |
| 70 | return generic::Memcmp<uint32_t>::block(p1, p2); |
| 71 | if (count == 5) |
| 72 | return generic::MemcmpSequence<uint32_t, uint8_t>::block(p1, p2); |
| 73 | if (count == 6) |
| 74 | return generic::MemcmpSequence<uint32_t, uint16_t>::block(p1, p2); |
| 75 | if (count == 7) |
| 76 | return generic::Memcmp<uint32_t>::head_tail(p1, p2, 7); |
| 77 | if (count == 8) |
| 78 | return generic::Memcmp<uint64_t>::block(p1, p2); |
| 79 | if (count <= 16) |
| 80 | return generic::Memcmp<uint64_t>::head_tail(p1, p2, count); |
| 81 | #if defined(__AVX512BW__) |
| 82 | return inline_memcmp_x86_avx512bw_gt16(p1, p2, count); |
| 83 | #elif defined(__AVX2__) |
| 84 | return inline_memcmp_x86_avx2_gt16(p1, p2, count); |
| 85 | #elif defined(__SSE4_1__) |
| 86 | return inline_memcmp_x86_sse41_gt16(p1, p2, count); |
| 87 | #else |
| 88 | return inline_memcmp_generic_gt16(p1, p2, count); |
| 89 | #endif |
| 90 | } |
| 91 | |
| 92 | } // namespace LIBC_NAMESPACE_DECL |
| 93 | |
| 94 | #endif // LLVM_LIBC_SRC_STRING_MEMORY_UTILS_X86_64_INLINE_MEMCMP_H |
| 95 |
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