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authorFelix Fietkau <nbd@openwrt.org>2010-03-11 18:49:01 +0000
committerFelix Fietkau <nbd@openwrt.org>2010-03-11 18:49:01 +0000
commit07e59c7bc7f375f792ec9734be42fe4fa391a8bb (patch)
tree84ce122bd887a52189dc7dcb6ffe7634c7109f62 /target/linux/generic-2.6/patches-2.6.34
parent0849a208ceec8623774c48a652f9c99ce3a5e472 (diff)
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mips: allow the compiler to optimize memset, memcmp, memcpy for better performance and (in some instances) smaller code
SVN-Revision: 20151
Diffstat (limited to 'target/linux/generic-2.6/patches-2.6.34')
-rw-r--r--target/linux/generic-2.6/patches-2.6.34/202-mips_mem_functions_performance.patch83
1 files changed, 83 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/patches-2.6.34/202-mips_mem_functions_performance.patch b/target/linux/generic-2.6/patches-2.6.34/202-mips_mem_functions_performance.patch
new file mode 100644
index 0000000..6ea9ba5
--- /dev/null
+++ b/target/linux/generic-2.6/patches-2.6.34/202-mips_mem_functions_performance.patch
@@ -0,0 +1,83 @@
+--- a/arch/mips/include/asm/string.h
++++ b/arch/mips/include/asm/string.h
+@@ -133,11 +133,44 @@ strncmp(__const__ char *__cs, __const__
+
+ #define __HAVE_ARCH_MEMSET
+ extern void *memset(void *__s, int __c, size_t __count);
++#define memset(__s, __c, len) \
++({ \
++ size_t __len = (len); \
++ void *__ret; \
++ if (__builtin_constant_p(len) && __len >= 64) \
++ __ret = memset((__s), (__c), __len); \
++ else \
++ __ret = __builtin_memset((__s), (__c), __len); \
++ __ret; \
++})
+
+ #define __HAVE_ARCH_MEMCPY
+ extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
++#define memcpy(dst, src, len) \
++({ \
++ size_t __len = (len); \
++ void *__ret; \
++ if (__builtin_constant_p(len) && __len >= 64) \
++ __ret = memcpy((dst), (src), __len); \
++ else \
++ __ret = __builtin_memcpy((dst), (src), __len); \
++ __ret; \
++})
+
+ #define __HAVE_ARCH_MEMMOVE
+ extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
++#define memmove(dst, src, len) \
++({ \
++ size_t __len = (len); \
++ void *__ret; \
++ if (__builtin_constant_p(len) && __len >= 64) \
++ __ret = memmove((dst), (src), __len); \
++ else \
++ __ret = __builtin_memmove((dst), (src), __len); \
++ __ret; \
++})
++
++#define __HAVE_ARCH_MEMCMP
++#define memcmp(src1, src2, len) __builtin_memcmp((src1), (src2), (len))
+
+ #endif /* _ASM_STRING_H */
+--- a/arch/mips/lib/Makefile
++++ b/arch/mips/lib/Makefile
+@@ -3,7 +3,7 @@
+ #
+
+ lib-y += csum_partial.o delay.o memcpy.o memcpy-inatomic.o memset.o \
+- strlen_user.o strncpy_user.o strnlen_user.o uncached.o
++ strlen_user.o strncpy_user.o strnlen_user.o uncached.o memcmp.o
+
+ obj-y += iomap.o
+ obj-$(CONFIG_PCI) += iomap-pci.o
+--- /dev/null
++++ b/arch/mips/lib/memcmp.c
+@@ -0,0 +1,22 @@
++/*
++ * copied from linux/lib/string.c
++ *
++ * Copyright (C) 1991, 1992 Linus Torvalds
++ */
++
++#include <linux/module.h>
++#include <linux/string.h>
++
++#undef memcmp
++int memcmp(const void *cs, const void *ct, size_t count)
++{
++ const unsigned char *su1, *su2;
++ int res = 0;
++
++ for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
++ if ((res = *su1 - *su2) != 0)
++ break;
++ return res;
++}
++EXPORT_SYMBOL(memcmp);
++