mips: allow the compiler to optimize memset, memcmp, memcpy for better performance and (in some instances) smaller code
SVN-Revision: 20151
This commit is contained in:
Felix Fietkau
parent
0849a208ce
commit
07e59c7bc7
5 changed files with 415 additions and 0 deletions
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@ -0,0 +1,83 @@
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--- a/arch/mips/include/asm/string.h
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+++ b/arch/mips/include/asm/string.h
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@@ -133,11 +133,44 @@ strncmp(__const__ char *__cs, __const__
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#define __HAVE_ARCH_MEMSET
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extern void *memset(void *__s, int __c, size_t __count);
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+#define memset(__s, __c, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memset((__s), (__c), __len); \
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+ else \
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+ __ret = __builtin_memset((__s), (__c), __len); \
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+ __ret; \
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+})
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#define __HAVE_ARCH_MEMCPY
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extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
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+#define memcpy(dst, src, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memcpy((dst), (src), __len); \
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+ else \
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+ __ret = __builtin_memcpy((dst), (src), __len); \
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+ __ret; \
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+})
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#define __HAVE_ARCH_MEMMOVE
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extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
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+#define memmove(dst, src, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memmove((dst), (src), __len); \
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+ else \
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+ __ret = __builtin_memmove((dst), (src), __len); \
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+ __ret; \
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+})
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+
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+#define __HAVE_ARCH_MEMCMP
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+#define memcmp(src1, src2, len) __builtin_memcmp((src1), (src2), (len))
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#endif /* _ASM_STRING_H */
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--- a/arch/mips/lib/Makefile
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+++ b/arch/mips/lib/Makefile
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@@ -3,7 +3,7 @@
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#
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lib-y += csum_partial.o delay.o memcpy.o memcpy-inatomic.o memset.o \
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- strlen_user.o strncpy_user.o strnlen_user.o uncached.o
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+ strlen_user.o strncpy_user.o strnlen_user.o uncached.o memcmp.o
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obj-y += iomap.o
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obj-$(CONFIG_PCI) += iomap-pci.o
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--- /dev/null
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+++ b/arch/mips/lib/memcmp.c
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@@ -0,0 +1,22 @@
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+/*
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+ * copied from linux/lib/string.c
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+ *
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+ * Copyright (C) 1991, 1992 Linus Torvalds
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/string.h>
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+
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+#undef memcmp
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+int memcmp(const void *cs, const void *ct, size_t count)
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+{
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+ const unsigned char *su1, *su2;
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+ int res = 0;
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+
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+ for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
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+ if ((res = *su1 - *su2) != 0)
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+ break;
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+ return res;
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+}
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+EXPORT_SYMBOL(memcmp);
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+
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@ -0,0 +1,83 @@
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--- a/arch/mips/include/asm/string.h
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+++ b/arch/mips/include/asm/string.h
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@@ -133,11 +133,44 @@ strncmp(__const__ char *__cs, __const__
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#define __HAVE_ARCH_MEMSET
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extern void *memset(void *__s, int __c, size_t __count);
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+#define memset(__s, __c, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memset((__s), (__c), __len); \
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+ else \
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+ __ret = __builtin_memset((__s), (__c), __len); \
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+ __ret; \
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+})
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#define __HAVE_ARCH_MEMCPY
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extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
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+#define memcpy(dst, src, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memcpy((dst), (src), __len); \
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+ else \
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+ __ret = __builtin_memcpy((dst), (src), __len); \
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+ __ret; \
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+})
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#define __HAVE_ARCH_MEMMOVE
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extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
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+#define memmove(dst, src, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memmove((dst), (src), __len); \
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+ else \
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+ __ret = __builtin_memmove((dst), (src), __len); \
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+ __ret; \
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+})
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+
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+#define __HAVE_ARCH_MEMCMP
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+#define memcmp(src1, src2, len) __builtin_memcmp((src1), (src2), (len))
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#endif /* _ASM_STRING_H */
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--- a/arch/mips/lib/Makefile
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+++ b/arch/mips/lib/Makefile
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@@ -3,7 +3,7 @@
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#
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lib-y += csum_partial.o delay.o memcpy.o memcpy-inatomic.o memset.o \
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- strlen_user.o strncpy_user.o strnlen_user.o uncached.o
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+ strlen_user.o strncpy_user.o strnlen_user.o uncached.o memcmp.o
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obj-y += iomap.o
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obj-$(CONFIG_PCI) += iomap-pci.o
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--- /dev/null
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+++ b/arch/mips/lib/memcmp.c
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@@ -0,0 +1,22 @@
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+/*
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+ * copied from linux/lib/string.c
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+ *
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+ * Copyright (C) 1991, 1992 Linus Torvalds
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/string.h>
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+
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+#undef memcmp
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+int memcmp(const void *cs, const void *ct, size_t count)
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+{
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+ const unsigned char *su1, *su2;
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+ int res = 0;
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+
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+ for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
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+ if ((res = *su1 - *su2) != 0)
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+ break;
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+ return res;
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+}
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+EXPORT_SYMBOL(memcmp);
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+
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@ -0,0 +1,83 @@
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--- a/arch/mips/include/asm/string.h
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+++ b/arch/mips/include/asm/string.h
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@@ -133,11 +133,44 @@ strncmp(__const__ char *__cs, __const__
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#define __HAVE_ARCH_MEMSET
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extern void *memset(void *__s, int __c, size_t __count);
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+#define memset(__s, __c, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memset((__s), (__c), __len); \
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+ else \
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+ __ret = __builtin_memset((__s), (__c), __len); \
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+ __ret; \
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+})
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#define __HAVE_ARCH_MEMCPY
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extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
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+#define memcpy(dst, src, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memcpy((dst), (src), __len); \
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+ else \
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+ __ret = __builtin_memcpy((dst), (src), __len); \
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+ __ret; \
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+})
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#define __HAVE_ARCH_MEMMOVE
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extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
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+#define memmove(dst, src, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memmove((dst), (src), __len); \
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+ else \
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+ __ret = __builtin_memmove((dst), (src), __len); \
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+ __ret; \
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+})
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+
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+#define __HAVE_ARCH_MEMCMP
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+#define memcmp(src1, src2, len) __builtin_memcmp((src1), (src2), (len))
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#endif /* _ASM_STRING_H */
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--- a/arch/mips/lib/Makefile
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+++ b/arch/mips/lib/Makefile
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@@ -3,7 +3,7 @@
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#
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lib-y += csum_partial.o delay.o memcpy.o memcpy-inatomic.o memset.o \
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- strlen_user.o strncpy_user.o strnlen_user.o uncached.o
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+ strlen_user.o strncpy_user.o strnlen_user.o uncached.o memcmp.o
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obj-y += iomap.o
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obj-$(CONFIG_PCI) += iomap-pci.o
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--- /dev/null
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+++ b/arch/mips/lib/memcmp.c
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@@ -0,0 +1,22 @@
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+/*
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+ * copied from linux/lib/string.c
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+ *
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+ * Copyright (C) 1991, 1992 Linus Torvalds
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/string.h>
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+
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+#undef memcmp
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+int memcmp(const void *cs, const void *ct, size_t count)
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+{
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+ const unsigned char *su1, *su2;
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+ int res = 0;
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+
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+ for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
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+ if ((res = *su1 - *su2) != 0)
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+ break;
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+ return res;
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+}
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+EXPORT_SYMBOL(memcmp);
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+
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@ -0,0 +1,83 @@
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--- a/arch/mips/include/asm/string.h
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+++ b/arch/mips/include/asm/string.h
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@@ -133,11 +133,44 @@ strncmp(__const__ char *__cs, __const__
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#define __HAVE_ARCH_MEMSET
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extern void *memset(void *__s, int __c, size_t __count);
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+#define memset(__s, __c, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memset((__s), (__c), __len); \
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+ else \
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+ __ret = __builtin_memset((__s), (__c), __len); \
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+ __ret; \
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+})
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#define __HAVE_ARCH_MEMCPY
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extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
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+#define memcpy(dst, src, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memcpy((dst), (src), __len); \
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+ else \
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+ __ret = __builtin_memcpy((dst), (src), __len); \
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+ __ret; \
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+})
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#define __HAVE_ARCH_MEMMOVE
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extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
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+#define memmove(dst, src, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memmove((dst), (src), __len); \
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+ else \
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+ __ret = __builtin_memmove((dst), (src), __len); \
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+ __ret; \
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+})
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+
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+#define __HAVE_ARCH_MEMCMP
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+#define memcmp(src1, src2, len) __builtin_memcmp((src1), (src2), (len))
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#endif /* _ASM_STRING_H */
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--- a/arch/mips/lib/Makefile
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+++ b/arch/mips/lib/Makefile
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@@ -3,7 +3,7 @@
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#
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lib-y += csum_partial.o delay.o memcpy.o memcpy-inatomic.o memset.o \
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- strlen_user.o strncpy_user.o strnlen_user.o uncached.o
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+ strlen_user.o strncpy_user.o strnlen_user.o uncached.o memcmp.o
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obj-y += iomap.o
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obj-$(CONFIG_PCI) += iomap-pci.o
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--- /dev/null
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+++ b/arch/mips/lib/memcmp.c
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@@ -0,0 +1,22 @@
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+/*
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+ * copied from linux/lib/string.c
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+ *
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+ * Copyright (C) 1991, 1992 Linus Torvalds
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/string.h>
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+
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+#undef memcmp
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+int memcmp(const void *cs, const void *ct, size_t count)
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+{
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+ const unsigned char *su1, *su2;
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+ int res = 0;
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+
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+ for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
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+ if ((res = *su1 - *su2) != 0)
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+ break;
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+ return res;
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+}
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+EXPORT_SYMBOL(memcmp);
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+
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@ -0,0 +1,83 @@
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--- a/arch/mips/include/asm/string.h
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+++ b/arch/mips/include/asm/string.h
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@@ -133,11 +133,44 @@ strncmp(__const__ char *__cs, __const__
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#define __HAVE_ARCH_MEMSET
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extern void *memset(void *__s, int __c, size_t __count);
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+#define memset(__s, __c, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memset((__s), (__c), __len); \
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+ else \
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+ __ret = __builtin_memset((__s), (__c), __len); \
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+ __ret; \
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+})
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#define __HAVE_ARCH_MEMCPY
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extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
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+#define memcpy(dst, src, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memcpy((dst), (src), __len); \
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+ else \
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+ __ret = __builtin_memcpy((dst), (src), __len); \
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+ __ret; \
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+})
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#define __HAVE_ARCH_MEMMOVE
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extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
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+#define memmove(dst, src, len) \
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+({ \
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+ size_t __len = (len); \
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+ void *__ret; \
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+ if (__builtin_constant_p(len) && __len >= 64) \
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+ __ret = memmove((dst), (src), __len); \
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+ else \
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+ __ret = __builtin_memmove((dst), (src), __len); \
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+ __ret; \
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+})
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+
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+#define __HAVE_ARCH_MEMCMP
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+#define memcmp(src1, src2, len) __builtin_memcmp((src1), (src2), (len))
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#endif /* _ASM_STRING_H */
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--- a/arch/mips/lib/Makefile
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+++ b/arch/mips/lib/Makefile
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@@ -3,7 +3,7 @@
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#
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lib-y += csum_partial.o delay.o memcpy.o memcpy-inatomic.o memset.o \
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- strlen_user.o strncpy_user.o strnlen_user.o uncached.o
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+ strlen_user.o strncpy_user.o strnlen_user.o uncached.o memcmp.o
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obj-y += iomap.o
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obj-$(CONFIG_PCI) += iomap-pci.o
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--- /dev/null
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+++ b/arch/mips/lib/memcmp.c
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@@ -0,0 +1,22 @@
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+/*
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+ * copied from linux/lib/string.c
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+ *
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+ * Copyright (C) 1991, 1992 Linus Torvalds
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/string.h>
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+
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+#undef memcmp
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+int memcmp(const void *cs, const void *ct, size_t count)
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+{
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+ const unsigned char *su1, *su2;
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+ int res = 0;
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+
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+ for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
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+ if ((res = *su1 - *su2) != 0)
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+ break;
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+ return res;
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+}
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+EXPORT_SYMBOL(memcmp);
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+
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