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//===-- Bcmp implementation for aarch64 -------------------------*- C++ -*-===//
//
// 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 LIBC_SRC_STRING_MEMORY_UTILS_AARCH64_INLINE_BCMP_H
#define LIBC_SRC_STRING_MEMORY_UTILS_AARCH64_INLINE_BCMP_H
#include "src/__support/macros/attributes.h" // LIBC_INLINE
#include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL
#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
#include "src/string/memory_utils/op_aarch64.h"
#include "src/string/memory_utils/op_generic.h"
#include "src/string/memory_utils/utils.h" // Ptr, CPtr
#include <stddef.h> // size_t
namespace LIBC_NAMESPACE_DECL {
[[maybe_unused]] LIBC_INLINE BcmpReturnType
inline_bcmp_aarch64_no_fp(CPtr p1, CPtr p2, size_t count) {
if (LIBC_LIKELY(count < 16)) {
switch (count) {
case 0:
return BcmpReturnType::zero();
case 1:
return generic::Bcmp<uint8_t>::block(p1, p2);
case 2:
return generic::Bcmp<uint16_t>::block(p1, p2);
case 3:
return generic::Bcmp<uint16_t>::head_tail(p1, p2, count);
case 4:
return generic::Bcmp<uint32_t>::block(p1, p2);
case 5:
case 6:
case 7:
return generic::Bcmp<uint32_t>::head_tail(p1, p2, count);
case 8:
return generic::Bcmp<uint64_t>::block(p1, p2);
case 9:
case 10:
case 11:
case 12:
case 13:
case 14:
case 15:
return generic::Bcmp<uint64_t>::head_tail(p1, p2, count);
}
}
return generic::Bcmp<uint64_t>::loop_and_tail_align_above(256, p1, p2, count);
}
#ifdef __ARM_NEON
[[maybe_unused]] LIBC_INLINE BcmpReturnType
inline_bcmp_aarch64_with_fp(CPtr p1, CPtr p2, size_t count) {
if (LIBC_LIKELY(count <= 32)) {
if (LIBC_UNLIKELY(count >= 16)) {
return aarch64::Bcmp<16>::head_tail(p1, p2, count);
}
switch (count) {
case 0:
return BcmpReturnType::zero();
case 1:
return generic::Bcmp<uint8_t>::block(p1, p2);
case 2:
return generic::Bcmp<uint16_t>::block(p1, p2);
case 3:
return generic::Bcmp<uint16_t>::head_tail(p1, p2, count);
case 4:
return generic::Bcmp<uint32_t>::block(p1, p2);
case 5:
case 6:
case 7:
return generic::Bcmp<uint32_t>::head_tail(p1, p2, count);
case 8:
return generic::Bcmp<uint64_t>::block(p1, p2);
case 9:
case 10:
case 11:
case 12:
case 13:
case 14:
case 15:
return generic::Bcmp<uint64_t>::head_tail(p1, p2, count);
}
}
if (count <= 64)
return aarch64::Bcmp<32>::head_tail(p1, p2, count);
// Aligned loop if > 256, otherwise normal loop
if (LIBC_UNLIKELY(count > 256)) {
if (auto value = aarch64::Bcmp<32>::block(p1, p2))
return value;
align_to_next_boundary<16, Arg::P1>(p1, p2, count);
}
return aarch64::Bcmp<32>::loop_and_tail(p1, p2, count);
}
#endif
[[gnu::flatten]] LIBC_INLINE BcmpReturnType
inline_bcmp_aarch64_dispatch(CPtr p1, CPtr p2, size_t count) {
#if defined(__ARM_NEON)
return inline_bcmp_aarch64_with_fp(p1, p2, count);
#else
return inline_bcmp_aarch64_no_fp(p1, p2, count);
#endif
}
} // namespace LIBC_NAMESPACE_DECL
#endif // LIBC_SRC_STRING_MEMORY_UTILS_AARCH64_INLINE_BCMP_H
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