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memset_implementations.h
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memset_implementations.h
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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/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]] inline static void
inline_memset_embedded_tiny(Ptr dst, uint8_t value, size_t count) {
#pragma nounroll
for (size_t offset = 0; offset < count; ++offset)
generic::Memset<1, 1>::block(dst + offset, value);
}
#if defined(LLVM_LIBC_ARCH_X86)
template <size_t MaxSize>
[[maybe_unused]] inline static void inline_memset_x86(Ptr dst, uint8_t value,
size_t count) {
if (count == 0)
return;
if (count == 1)
return generic::Memset<1, MaxSize>::block(dst, value);
if (count == 2)
return generic::Memset<2, MaxSize>::block(dst, value);
if (count == 3)
return generic::Memset<3, MaxSize>::block(dst, value);
if (count <= 8)
return generic::Memset<4, MaxSize>::head_tail(dst, value, count);
if (count <= 16)
return generic::Memset<8, MaxSize>::head_tail(dst, value, count);
if (count <= 32)
return generic::Memset<16, MaxSize>::head_tail(dst, value, count);
if (count <= 64)
return generic::Memset<32, MaxSize>::head_tail(dst, value, count);
if (count <= 128)
return generic::Memset<64, MaxSize>::head_tail(dst, value, count);
// Aligned loop
generic::Memset<32, MaxSize>::block(dst, value);
align_to_next_boundary<32>(dst, count);
return generic::Memset<32, MaxSize>::loop_and_tail(dst, value, count);
}
#endif // defined(LLVM_LIBC_ARCH_X86)
#if defined(LLVM_LIBC_ARCH_AARCH64)
template <size_t MaxSize>
[[maybe_unused]] inline static void
inline_memset_aarch64(Ptr dst, uint8_t value, size_t count) {
if (count == 0)
return;
if (count <= 3) {
generic::Memset<1, MaxSize>::block(dst, value);
if (count > 1)
generic::Memset<2, MaxSize>::tail(dst, value, count);
return;
}
if (count <= 8)
return generic::Memset<4, MaxSize>::head_tail(dst, value, count);
if (count <= 16)
return generic::Memset<8, MaxSize>::head_tail(dst, value, count);
if (count <= 32)
return generic::Memset<16, MaxSize>::head_tail(dst, value, count);
if (count <= (32 + 64)) {
generic::Memset<32, MaxSize>::block(dst, value);
if (count <= 64)
return generic::Memset<32, MaxSize>::tail(dst, value, count);
generic::Memset<32, MaxSize>::block(dst + 32, value);
generic::Memset<32, MaxSize>::tail(dst, value, count);
return;
}
if (count >= 448 && value == 0 && aarch64::neon::hasZva()) {
generic::Memset<64, MaxSize>::block(dst, 0);
align_to_next_boundary<64>(dst, count);
return aarch64::neon::BzeroCacheLine<64>::loop_and_tail(dst, 0, count);
} else {
generic::Memset<16, MaxSize>::block(dst, value);
align_to_next_boundary<16>(dst, count);
return generic::Memset<64, MaxSize>::loop_and_tail(dst, value, count);
}
}
#endif // defined(LLVM_LIBC_ARCH_AARCH64)
inline static void inline_memset(Ptr dst, uint8_t value, size_t count) {
#if defined(LLVM_LIBC_ARCH_X86)
static constexpr size_t kMaxSize = x86::kAvx512F ? 64
: x86::kAvx ? 32
: x86::kSse2 ? 16
: 8;
return inline_memset_x86<kMaxSize>(dst, value, count);
#elif defined(LLVM_LIBC_ARCH_AARCH64)
static constexpr size_t kMaxSize = aarch64::kNeon ? 16 : 8;
return inline_memset_aarch64<kMaxSize>(dst, value, count);
#elif defined(LLVM_LIBC_ARCH_ARM)
return inline_memset_embedded_tiny(dst, value, count);
#elif defined(LLVM_LIBC_ARCH_GPU)
return inline_memset_embedded_tiny(dst, value, count);
#else
#error "Unsupported platform"
#endif
}
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