target/linux/generic/patches-2.6.39/306-mips_mem_functions_performance.patch

   1 --- a/arch/mips/include/asm/string.h
   2 +++ b/arch/mips/include/asm/string.h
   3 @@ -133,11 +133,44 @@ strncmp(__const__ char *__cs, __const__
   4
   5  #define __HAVE_ARCH_MEMSET
   6  extern void *memset(void *__s, int __c, size_t __count);
   7 +#define memset(__s, __c, len)                                  \
   8 +({                                                             \
   9 +       size_t __len = (len);                                   \
  10 +       void *__ret;                                            \
  11 +       if (__builtin_constant_p(len) && __len >= 64)           \
  12 +               __ret = memset((__s), (__c), __len);            \
  13 +       else                                                    \
  14 +               __ret = __builtin_memset((__s), (__c), __len);  \
  15 +       __ret;                                                  \
  16 +})
  17
  18  #define __HAVE_ARCH_MEMCPY
  19  extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
  20 +#define memcpy(dst, src, len)                                  \
  21 +({                                                             \
  22 +       size_t __len = (len);                                   \
  23 +       void *__ret;                                            \
  24 +       if (__builtin_constant_p(len) && __len >= 64)           \
  25 +               __ret = memcpy((dst), (src), __len);            \
  26 +       else                                                    \
  27 +               __ret = __builtin_memcpy((dst), (src), __len);  \
  28 +       __ret;                                                  \
  29 +})
  30
  31  #define __HAVE_ARCH_MEMMOVE
  32  extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
  33 +#define memmove(dst, src, len)                                 \
  34 +({                                                             \
  35 +       size_t __len = (len);                                   \
  36 +       void *__ret;                                            \
  37 +       if (__builtin_constant_p(len) && __len >= 64)           \
  38 +               __ret = memmove((dst), (src), __len);           \
  39 +       else                                                    \
  40 +               __ret = __builtin_memmove((dst), (src), __len); \
  41 +       __ret;                                                  \
  42 +})
  43 +
  44 +#define __HAVE_ARCH_MEMCMP
  45 +#define memcmp(src1, src2, len) __builtin_memcmp((src1), (src2), (len))
  46
  47  #endif /* _ASM_STRING_H */
  48 --- a/arch/mips/lib/Makefile
  49 +++ b/arch/mips/lib/Makefile
  50 @@ -3,7 +3,7 @@
  51  #
  52
  53  lib-y  += csum_partial.o delay.o memcpy.o memcpy-inatomic.o memset.o \
  54 -          strlen_user.o strncpy_user.o strnlen_user.o uncached.o
  55 +          strlen_user.o strncpy_user.o strnlen_user.o uncached.o memcmp.o
  56
  57  obj-y                  += iomap.o
  58  obj-$(CONFIG_PCI)      += iomap-pci.o
  59 --- /dev/null
  60 +++ b/arch/mips/lib/memcmp.c
  61 @@ -0,0 +1,22 @@
  62 +/*
  63 + *  copied from linux/lib/string.c
  64 + *
  65 + *  Copyright (C) 1991, 1992  Linus Torvalds
  66 + */
  67 +
  68 +#include <linux/module.h>
  69 +#include <linux/string.h>
  70 +
  71 +#undef memcmp
  72 +int memcmp(const void *cs, const void *ct, size_t count)
  73 +{
  74 +       const unsigned char *su1, *su2;
  75 +       int res = 0;
  76 +
  77 +       for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
  78 +               if ((res = *su1 - *su2) != 0)
  79 +                       break;
  80 +       return res;
  81 +}
  82 +EXPORT_SYMBOL(memcmp);
  83 +