diff options
| author | Carmelo Amoroso <carmelo.amoroso@st.com> | 2008-09-09 16:55:27 +0000 |
|---|---|---|
| committer | Carmelo Amoroso <carmelo.amoroso@st.com> | 2008-09-09 16:55:27 +0000 |
| commit | e4f55f33f69fce85099dd5936cc74856aa1b453d (patch) | |
| tree | f35d6680197aa43098c99291e909150bf52f409a /libc/string/generic/memmove.c | |
| parent | a79016198c859a3388584ac7782d760f349e2d67 (diff) | |
Add optimized memcpy implementation for sh4 (from Stuart Menefy @STMicroelectronics).
This implementation is based on 'backward copying'.
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
Diffstat (limited to 'libc/string/generic/memmove.c')
| -rw-r--r-- | libc/string/generic/memmove.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/libc/string/generic/memmove.c b/libc/string/generic/memmove.c index b2a017b16..7f945b150 100644 --- a/libc/string/generic/memmove.c +++ b/libc/string/generic/memmove.c @@ -24,12 +24,18 @@ #include "memcopy.h" #include "pagecopy.h" +#ifdef __ARCH_HAS_BWD_MEMCPY__ +/* generic-opt memmove assumes memcpy does forward copying! */ +#include "_memcpy_fwd.c" +#endif + /* Experimentally off - libc_hidden_proto(memmove) */ /* Experimentally off - libc_hidden_proto(memcpy) */ static void _wordcopy_bwd_aligned (long int dstp, long int srcp, size_t len) { - op_t a0, a1; + op_t a0 = 0; + op_t a1 = 0; switch (len % 8) { @@ -133,7 +139,10 @@ static void _wordcopy_bwd_aligned (long int dstp, long int srcp, size_t len) static void _wordcopy_bwd_dest_aligned (long int dstp, long int srcp, size_t len) { - op_t a0, a1, a2, a3; + op_t a0 = 0; + op_t a1 = 0; + op_t a2 = 0; + op_t a3 = 0; int sh_1, sh_2; /* Calculate how to shift a word read at the memory operation @@ -218,8 +227,8 @@ void *memmove (void *dest, const void *src, size_t len) Reduces the working set. */ if (dstp - srcp >= len) /* *Unsigned* compare! */ { -#if 1 -#warning REMINDER: generic-opt memmove assumes memcpy does forward copying! +#ifndef __ARCH_HAS_BWD_MEMCPY__ + /* Backward memcpy implementation cannot be used */ memcpy(dest, src, len); #else /* Copy from the beginning to the end. */ |