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//===-- Implementation of memset and bzero --------------------------------===//
//
// 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_MEMSET_IMPLEMENTATIONS_H
#define LLVM_LIBC_SRC_STRING_MEMORY_UTILS_MEMSET_IMPLEMENTATIONS_H
#include "src/__support/common.h"
#include "src/__support/macros/optimization.h"
#include "src/__support/macros/properties/architectures.h"
#include "src/string/memory_utils/op_aarch64.h"
#include "src/string/memory_utils/op_builtin.h"
#include "src/string/memory_utils/op_generic.h"
#include "src/string/memory_utils/op_x86.h"
#include "src/string/memory_utils/utils.h"
#include <stddef.h> // size_t
namespace __llvm_libc {
[[maybe_unused]] LIBC_INLINE static void
inline_memset_embedded_tiny(Ptr dst, uint8_t value, size_t count) {
LIBC_LOOP_NOUNROLL
for (size_t offset = 0; offset < count; ++offset)
generic::Memset<uint8_t>::block(dst + offset, value);
}
#if defined(LIBC_TARGET_ARCH_IS_X86)
[[maybe_unused]] LIBC_INLINE static void
inline_memset_x86(Ptr dst, uint8_t value, size_t count) {
#if defined(__AVX512F__)
using uint128_t = uint8x16_t;
using uint256_t = uint8x32_t;
using uint512_t = uint8x64_t;
#elif defined(__AVX__)
using uint128_t = uint8x16_t;
using uint256_t = uint8x32_t;
using uint512_t = cpp::array<uint8x32_t, 2>;
#elif defined(__SSE2__)
using uint128_t = uint8x16_t;
using uint256_t = cpp::array<uint8x16_t, 2>;
using uint512_t = cpp::array<uint8x16_t, 4>;
#else
using uint128_t = cpp::array<uint64_t, 2>;
using uint256_t = cpp::array<uint64_t, 4>;
using uint512_t = cpp::array<uint64_t, 8>;
#endif
if (count == 0)
return;
if (count == 1)
return generic::Memset<uint8_t>::block(dst, value);
if (count == 2)
return generic::Memset<uint16_t>::block(dst, value);
if (count == 3)
return generic::MemsetSequence<uint16_t, uint8_t>::block(dst, value);
if (count <= 8)
return generic::Memset<uint32_t>::head_tail(dst, value, count);
if (count <= 16)
return generic::Memset<uint64_t>::head_tail(dst, value, count);
if (count <= 32)
return generic::Memset<uint128_t>::head_tail(dst, value, count);
if (count <= 64)
return generic::Memset<uint256_t>::head_tail(dst, value, count);
if (count <= 128)
return generic::Memset<uint512_t>::head_tail(dst, value, count);
// Aligned loop
generic::Memset<uint256_t>::block(dst, value);
align_to_next_boundary<32>(dst, count);
return generic::Memset<uint256_t>::loop_and_tail(dst, value, count);
}
#endif // defined(LIBC_TARGET_ARCH_IS_X86)
#if defined(LIBC_TARGET_ARCH_IS_AARCH64)
[[maybe_unused]] LIBC_INLINE static void
inline_memset_aarch64(Ptr dst, uint8_t value, size_t count) {
static_assert(aarch64::kNeon, "aarch64 supports vector types");
using uint128_t = uint8x16_t;
using uint256_t = uint8x32_t;
using uint512_t = uint8x64_t;
if (count == 0)
return;
if (count <= 3) {
generic::Memset<uint8_t>::block(dst, value);
if (count > 1)
generic::Memset<uint16_t>::tail(dst, value, count);
return;
}
if (count <= 8)
return generic::Memset<uint32_t>::head_tail(dst, value, count);
if (count <= 16)
return generic::Memset<uint64_t>::head_tail(dst, value, count);
if (count <= 32)
return generic::Memset<uint128_t>::head_tail(dst, value, count);
if (count <= (32 + 64)) {
generic::Memset<uint256_t>::block(dst, value);
if (count <= 64)
return generic::Memset<uint256_t>::tail(dst, value, count);
generic::Memset<uint256_t>::block(dst + 32, value);
generic::Memset<uint256_t>::tail(dst, value, count);
return;
}
if (count >= 448 && value == 0 && aarch64::neon::hasZva()) {
generic::Memset<uint512_t>::block(dst, 0);
align_to_next_boundary<64>(dst, count);
return aarch64::neon::BzeroCacheLine::loop_and_tail(dst, 0, count);
} else {
generic::Memset<uint128_t>::block(dst, value);
align_to_next_boundary<16>(dst, count);
return generic::Memset<uint512_t>::loop_and_tail(dst, value, count);
}
}
#endif // defined(LIBC_TARGET_ARCH_IS_AARCH64)
LIBC_INLINE static void inline_memset(Ptr dst, uint8_t value, size_t count) {
#if defined(LIBC_TARGET_ARCH_IS_X86)
return inline_memset_x86(dst, value, count);
#elif defined(LIBC_TARGET_ARCH_IS_AARCH64)
return inline_memset_aarch64(dst, value, count);
#else
return inline_memset_embedded_tiny(dst, value, count);
#endif
}
LIBC_INLINE static void inline_memset(void *dst, uint8_t value, size_t count) {
inline_memset(reinterpret_cast<Ptr>(dst), value, count);
}
} // namespace __llvm_libc
#endif // LLVM_LIBC_SRC_STRING_MEMORY_UTILS_MEMSET_IMPLEMENTATIONS_H
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