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| 1 | //===-- Bcmp 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 | #ifndef LLVM_LIBC_SRC_STRING_MEMORY_UTILS_X86_64_INLINE_BCMP_H |
| 9 | #define LLVM_LIBC_SRC_STRING_MEMORY_UTILS_X86_64_INLINE_BCMP_H |
| 10 | |
| 11 | #include "src/__support/macros/attributes.h" // LIBC_INLINE |
| 12 | #include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL |
| 13 | #include "src/string/memory_utils/op_generic.h" |
| 14 | #include "src/string/memory_utils/op_x86.h" |
| 15 | #include "src/string/memory_utils/utils.h" // Ptr, CPtr |
| 16 | |
| 17 | #include <stddef.h> // size_t |
| 18 | |
| 19 | namespace LIBC_NAMESPACE_DECL { |
| 20 | |
| 21 | [[maybe_unused]] LIBC_INLINE BcmpReturnType |
| 22 | inline_bcmp_generic_gt16(CPtr p1, CPtr p2, size_t count) { |
| 23 | return generic::Bcmp<uint64_t>::loop_and_tail_align_above(256, p1, p2, count); |
| 24 | } |
| 25 | |
| 26 | #if defined(__SSE4_1__) |
| 27 | [[maybe_unused]] LIBC_INLINE BcmpReturnType |
| 28 | inline_bcmp_x86_sse41_gt16(CPtr p1, CPtr p2, size_t count) { |
| 29 | if (count <= 32) |
| 30 | return generic::branchless_head_tail_neq<__m128i>(p1, p2, count); |
| 31 | return generic::Bcmp<__m128i>::loop_and_tail_align_above(256, p1, p2, count); |
| 32 | } |
| 33 | #endif // __SSE4_1__ |
| 34 | |
| 35 | #if defined(__AVX__) |
| 36 | [[maybe_unused]] LIBC_INLINE BcmpReturnType |
| 37 | inline_bcmp_x86_avx_gt16(CPtr p1, CPtr p2, size_t count) { |
| 38 | if (count <= 32) |
| 39 | return generic::branchless_head_tail_neq<__m128i>(p1, p2, count); |
| 40 | if (count <= 64) |
| 41 | return generic::branchless_head_tail_neq<__m256i>(p1, p2, count); |
| 42 | return generic::Bcmp<__m256i>::loop_and_tail_align_above(256, p1, p2, count); |
| 43 | } |
| 44 | #endif // __AVX__ |
| 45 | |
| 46 | #if defined(__AVX512BW__) |
| 47 | [[maybe_unused]] LIBC_INLINE BcmpReturnType |
| 48 | inline_bcmp_x86_avx512bw_gt16(CPtr p1, CPtr p2, size_t count) { |
| 49 | if (count <= 32) |
| 50 | return generic::branchless_head_tail_neq<__m128i>(p1, p2, count); |
| 51 | if (count <= 64) |
| 52 | return generic::branchless_head_tail_neq<__m256i>(p1, p2, count); |
| 53 | if (count <= 128) |
| 54 | return generic::branchless_head_tail_neq<__m512i>(p1, p2, count); |
| 55 | return generic::Bcmp<__m512i>::loop_and_tail_align_above(256, p1, p2, count); |
| 56 | } |
| 57 | #endif // __AVX512BW__ |
| 58 | |
| 59 | [[maybe_unused]] LIBC_INLINE BcmpReturnType inline_bcmp_x86(CPtr p1, CPtr p2, |
| 60 | size_t count) { |
| 61 | if (count == 0) |
| 62 | return BcmpReturnType::zero(); |
| 63 | if (count == 1) |
| 64 | return generic::Bcmp<uint8_t>::block(p1, p2); |
| 65 | if (count <= 4) |
| 66 | return generic::branchless_head_tail_neq<uint16_t>(p1, p2, count); |
| 67 | if (count <= 8) |
| 68 | return generic::branchless_head_tail_neq<uint32_t>(p1, p2, count); |
| 69 | if (count <= 16) |
| 70 | return generic::branchless_head_tail_neq<uint64_t>(p1, p2, count); |
| 71 | #if defined(__AVX512BW__) |
| 72 | return inline_bcmp_x86_avx512bw_gt16(p1, p2, count); |
| 73 | #elif defined(__AVX__) |
| 74 | return inline_bcmp_x86_avx_gt16(p1, p2, count); |
| 75 | #elif defined(__SSE4_1__) |
| 76 | return inline_bcmp_x86_sse41_gt16(p1, p2, count); |
| 77 | #else |
| 78 | return inline_bcmp_generic_gt16(p1, p2, count); |
| 79 | #endif |
| 80 | } |
| 81 | |
| 82 | } // namespace LIBC_NAMESPACE_DECL |
| 83 | |
| 84 | #endif // LLVM_LIBC_SRC_STRING_MEMORY_UTILS_X86_64_INLINE_BCMP_H |
| 85 |
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