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https://github.com/cuberite/libdeflate.git
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14be043724
With -ffreestanding, for memcpy() to be optimized properly when used for unaligned accesses, we need to use __builtin_memcpy().
68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
/*
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* lib_common.h - internal header included by all library code
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*/
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#ifndef LIB_LIB_COMMON_H
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#define LIB_LIB_COMMON_H
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#ifdef LIBDEFLATE_H
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# error "lib_common.h must always be included before libdeflate.h"
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/* because BUILDING_LIBDEFLATE must be set first */
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#endif
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#define BUILDING_LIBDEFLATE
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#include "../common/common_defs.h"
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/*
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* Prefix with "_libdeflate_" all global symbols which are not part of the API
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* and don't already have a "libdeflate" prefix. This avoids exposing overly
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* generic names when libdeflate is built as a static library.
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*
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* Note that the chosen prefix is not really important and can be changed
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* without breaking library users. It was just chosen so that the resulting
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* symbol names are unlikely to conflict with those from any other software.
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* Also note that this fixup has no useful effect when libdeflate is built as a
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* shared library, since these symbols are not exported.
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*/
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#define SYM_FIXUP(sym) _libdeflate_##sym
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#define deflate_get_compression_level SYM_FIXUP(deflate_get_compression_level)
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#define _cpu_features SYM_FIXUP(_cpu_features)
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#define setup_cpu_features SYM_FIXUP(setup_cpu_features)
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void *libdeflate_malloc(size_t size);
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void libdeflate_free(void *ptr);
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void *libdeflate_aligned_malloc(size_t alignment, size_t size);
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void libdeflate_aligned_free(void *ptr);
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#ifdef FREESTANDING
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/*
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* With -ffreestanding, <string.h> may be missing, and we must provide
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* implementations of memset(), memcpy(), memmove(), and memcmp().
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* See https://gcc.gnu.org/onlinedocs/gcc/Standards.html
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*
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* Also, -ffreestanding disables interpreting calls to these functions as
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* built-ins. E.g., calling memcpy(&v, p, WORDBYTES) will make a function call,
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* not be optimized to a single load instruction. For performance reasons we
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* don't want that. So, declare these functions as macros that expand to the
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* corresponding built-ins. This approach is recommended in the gcc man page.
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* We still need the actual function definitions in case gcc calls them.
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*/
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void *memset(void *s, int c, size_t n);
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#define memset(s, c, n) __builtin_memset((s), (c), (n))
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void *memcpy(void *dest, const void *src, size_t n);
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#define memcpy(dest, src, n) __builtin_memcpy((dest), (src), (n))
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void *memmove(void *dest, const void *src, size_t n);
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#define memmove(dest, src, n) __builtin_memmove((dest), (src), (n))
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int memcmp(const void *s1, const void *s2, size_t n);
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#define memcmp(s1, s2, n) __builtin_memcmp((s1), (s2), (n))
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#else
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#include <string.h>
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#endif
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#endif /* LIB_LIB_COMMON_H */
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