diff options
Diffstat (limited to 'libc/string/sh/sh4/memmove.c')
| -rw-r--r-- | libc/string/sh/sh4/memmove.c | 62 |
1 files changed, 30 insertions, 32 deletions
diff --git a/libc/string/sh/sh4/memmove.c b/libc/string/sh/sh4/memmove.c index 3102039a6..4d52db2ca 100644 --- a/libc/string/sh/sh4/memmove.c +++ b/libc/string/sh/sh4/memmove.c @@ -9,37 +9,6 @@ #include <string.h> -static void fpu_optimised_copy_fwd(void *dest, const void *src, size_t len); - -void *memmove(void *dest, const void *src, size_t len) -{ - unsigned long int d = (long int)dest; - unsigned long int s = (long int)src; - unsigned long int res; - - if (d >= s) - res = d - s; - else - res = s - d; - /* - * 1) dest and src are not overlap ==> memcpy (BWD/FDW) - * 2) dest and src are 100% overlap ==> memcpy (BWD/FDW) - * 3) left-to-right overlap ==> Copy from the beginning to the end - * 4) right-to-left overlap ==> Copy from the end to the beginning - */ - - if (res == 0) /* 100% overlap */ - memcpy(dest, src, len); /* No overlap */ - else if (res >= len) - memcpy(dest, src, len); - else { - if (d > s) /* right-to-left overlap */ - memcpy(dest, src, len); /* memcpy is BWD */ - else /* cannot use SH4 memcpy for this case */ - fpu_optimised_copy_fwd(dest, src, len); - } - return (dest); -} #define FPSCR_SR (1 << 20) #define STORE_FPSCR(x) __asm__ volatile("sts fpscr, %0" : "=r"(x)) @@ -101,7 +70,6 @@ static void fpu_optimised_copy_fwd(void *dest, const void *src, size_t len) d1 += 2; len -= 32; } - LOAD_FPSCR(fpscr); } s = (char *)s1; @@ -116,4 +84,34 @@ static void fpu_optimised_copy_fwd(void *dest, const void *src, size_t len) return; } +void *memmove(void *dest, const void *src, size_t len) +{ + unsigned long int d = (long int)dest; + unsigned long int s = (long int)src; + unsigned long int res; + + if (d >= s) + res = d - s; + else + res = s - d; + /* + * 1) dest and src are not overlap ==> memcpy (BWD/FDW) + * 2) dest and src are 100% overlap ==> memcpy (BWD/FDW) + * 3) left-to-right overlap ==> Copy from the beginning to the end + * 4) right-to-left overlap ==> Copy from the end to the beginning + */ + + if (res == 0) /* 100% overlap */ + memcpy(dest, src, len); /* No overlap */ + else if (res >= len) + memcpy(dest, src, len); + else { + if (d > s) /* right-to-left overlap */ + memcpy(dest, src, len); /* memcpy is BWD */ + else /* cannot use SH4 memcpy for this case */ + fpu_optimised_copy_fwd(dest, src, len); + } + return (dest); +} + libc_hidden_def(memmove) |