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65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/*
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* SPDX-FileCopyrightText: 1994-2009 Red Hat, Inc.
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*
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD AND Apache-2.0
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*
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* SPDX-FileContributor: 2025 Espressif Systems (Shanghai) CO LTD
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*/
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#include <_ansi.h>
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#include <limits.h>
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/*
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Taken from glibc:
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Add the compiler optimization to inhibit loop transformation to library
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calls. This is used to avoid recursive calls in memset and memmove
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default implementations.
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*/
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# define __inhibit_loop_to_libcall \
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__attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
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/* Nonzero if X is not aligned on a "long" boundary.
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* This macro is used to skip a few bytes to find an aligned pointer.
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* It's better to keep it as is even if _HAVE_HW_MISALIGNED_ACCESS is enabled,
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* to avoid small performance penalties (if they are not zero). */
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#define UNALIGNED_X(X) ((long)X & (sizeof (long) - 1))
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#ifndef _HAVE_HW_MISALIGNED_ACCESS
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#define _HAVE_HW_MISALIGNED_ACCESS (__riscv_misaligned_fast || __riscv_misaligned_slow)
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#endif
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#if _HAVE_HW_MISALIGNED_ACCESS
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/* Hardware performs unaligned operations with little
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* to no penalty compared to byte-to-byte copy. */
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#define UNALIGNED_X_Y(X, Y) (0)
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#else /* _HAVE_HW_MISALIGNED_ACCESS */
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/* Nonzero if either X or Y is not aligned on a "long" boundary. */
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#define UNALIGNED_X_Y(X, Y) \
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(((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1)))
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#endif /* _HAVE_HW_MISALIGNED_ACCESS */
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/* How many bytes are copied each iteration of the word copy loop. */
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#define LITTLE_BLOCK_SIZE (sizeof (long))
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/* How many bytes are copied each iteration of the 4X unrolled loop. */
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#define BIG_BLOCK_SIZE (sizeof (long) << 2)
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/* Threshold for punting to the little block byte copier. */
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#define TOO_SMALL_LITTLE_BLOCK(LEN) ((LEN) < LITTLE_BLOCK_SIZE)
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/* Threshold for punting to the big block byte copier. */
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#define TOO_SMALL_BIG_BLOCK(LEN) ((LEN) < BIG_BLOCK_SIZE)
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/* Macros for detecting endchar. */
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#if LONG_MAX == 2147483647L
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#define DETECT_NULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080)
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#else
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#if LONG_MAX == 9223372036854775807L
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/* Nonzero if X (a long int) contains a NULL byte. */
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#define DETECT_NULL(X) (((X) - 0x0101010101010101) & ~(X) & 0x8080808080808080)
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#else
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#error long int is not a 32bit or 64bit type.
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#endif
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#endif
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/* Returns nonzero if (long)X contains the byte used to fill (long)MASK. */
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#define DETECT_CHAR(X, MASK) (DETECT_NULL(X ^ MASK))
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