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authorCarmelo Amoroso <carmelo.amoroso@st.com>2008-09-09 16:55:27 +0000
committerCarmelo Amoroso <carmelo.amoroso@st.com>2008-09-09 16:55:27 +0000
commite4f55f33f69fce85099dd5936cc74856aa1b453d (patch)
treef35d6680197aa43098c99291e909150bf52f409a /libc/string/generic/memcpy.c
parenta79016198c859a3388584ac7782d760f349e2d67 (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/memcpy.c')
-rw-r--r--libc/string/generic/memcpy.c186
1 files changed, 0 insertions, 186 deletions
diff --git a/libc/string/generic/memcpy.c b/libc/string/generic/memcpy.c
index fa6606ceb..4284f2fe5 100644
--- a/libc/string/generic/memcpy.c
+++ b/libc/string/generic/memcpy.c
@@ -25,192 +25,6 @@
/* Experimentally off - libc_hidden_proto(memcpy) */
-/* _wordcopy_fwd_aligned -- Copy block beginning at SRCP to
- block beginning at DSTP with LEN `op_t' words (not LEN bytes!).
- Both SRCP and DSTP should be aligned for memory operations on `op_t's. */
-
-static void _wordcopy_fwd_aligned (long int dstp, long int srcp, size_t len)
-{
- op_t a0, a1;
-
- switch (len % 8)
- {
- case 2:
- a0 = ((op_t *) srcp)[0];
- srcp -= 6 * OPSIZ;
- dstp -= 7 * OPSIZ;
- len += 6;
- goto do1;
- case 3:
- a1 = ((op_t *) srcp)[0];
- srcp -= 5 * OPSIZ;
- dstp -= 6 * OPSIZ;
- len += 5;
- goto do2;
- case 4:
- a0 = ((op_t *) srcp)[0];
- srcp -= 4 * OPSIZ;
- dstp -= 5 * OPSIZ;
- len += 4;
- goto do3;
- case 5:
- a1 = ((op_t *) srcp)[0];
- srcp -= 3 * OPSIZ;
- dstp -= 4 * OPSIZ;
- len += 3;
- goto do4;
- case 6:
- a0 = ((op_t *) srcp)[0];
- srcp -= 2 * OPSIZ;
- dstp -= 3 * OPSIZ;
- len += 2;
- goto do5;
- case 7:
- a1 = ((op_t *) srcp)[0];
- srcp -= 1 * OPSIZ;
- dstp -= 2 * OPSIZ;
- len += 1;
- goto do6;
-
- case 0:
- if (OP_T_THRES <= 3 * OPSIZ && len == 0)
- return;
- a0 = ((op_t *) srcp)[0];
- srcp -= 0 * OPSIZ;
- dstp -= 1 * OPSIZ;
- goto do7;
- case 1:
- a1 = ((op_t *) srcp)[0];
- srcp -=-1 * OPSIZ;
- dstp -= 0 * OPSIZ;
- len -= 1;
- if (OP_T_THRES <= 3 * OPSIZ && len == 0)
- goto do0;
- goto do8; /* No-op. */
- }
-
- do
- {
- do8:
- a0 = ((op_t *) srcp)[0];
- ((op_t *) dstp)[0] = a1;
- do7:
- a1 = ((op_t *) srcp)[1];
- ((op_t *) dstp)[1] = a0;
- do6:
- a0 = ((op_t *) srcp)[2];
- ((op_t *) dstp)[2] = a1;
- do5:
- a1 = ((op_t *) srcp)[3];
- ((op_t *) dstp)[3] = a0;
- do4:
- a0 = ((op_t *) srcp)[4];
- ((op_t *) dstp)[4] = a1;
- do3:
- a1 = ((op_t *) srcp)[5];
- ((op_t *) dstp)[5] = a0;
- do2:
- a0 = ((op_t *) srcp)[6];
- ((op_t *) dstp)[6] = a1;
- do1:
- a1 = ((op_t *) srcp)[7];
- ((op_t *) dstp)[7] = a0;
-
- srcp += 8 * OPSIZ;
- dstp += 8 * OPSIZ;
- len -= 8;
- }
- while (len != 0);
-
- /* This is the right position for do0. Please don't move
- it into the loop. */
- do0:
- ((op_t *) dstp)[0] = a1;
-}
-
-/* _wordcopy_fwd_dest_aligned -- Copy block beginning at SRCP to
- block beginning at DSTP with LEN `op_t' words (not LEN bytes!).
- DSTP should be aligned for memory operations on `op_t's, but SRCP must
- *not* be aligned. */
-
-static void _wordcopy_fwd_dest_aligned (long int dstp, long int srcp, size_t len)
-{
- op_t a0, a1, a2, a3;
- int sh_1, sh_2;
-
- /* Calculate how to shift a word read at the memory operation
- aligned srcp to make it aligned for copy. */
-
- sh_1 = 8 * (srcp % OPSIZ);
- sh_2 = 8 * OPSIZ - sh_1;
-
- /* Make SRCP aligned by rounding it down to the beginning of the `op_t'
- it points in the middle of. */
- srcp &= -OPSIZ;
-
- switch (len % 4)
- {
- case 2:
- a1 = ((op_t *) srcp)[0];
- a2 = ((op_t *) srcp)[1];
- srcp -= 1 * OPSIZ;
- dstp -= 3 * OPSIZ;
- len += 2;
- goto do1;
- case 3:
- a0 = ((op_t *) srcp)[0];
- a1 = ((op_t *) srcp)[1];
- srcp -= 0 * OPSIZ;
- dstp -= 2 * OPSIZ;
- len += 1;
- goto do2;
- case 0:
- if (OP_T_THRES <= 3 * OPSIZ && len == 0)
- return;
- a3 = ((op_t *) srcp)[0];
- a0 = ((op_t *) srcp)[1];
- srcp -=-1 * OPSIZ;
- dstp -= 1 * OPSIZ;
- len += 0;
- goto do3;
- case 1:
- a2 = ((op_t *) srcp)[0];
- a3 = ((op_t *) srcp)[1];
- srcp -=-2 * OPSIZ;
- dstp -= 0 * OPSIZ;
- len -= 1;
- if (OP_T_THRES <= 3 * OPSIZ && len == 0)
- goto do0;
- goto do4; /* No-op. */
- }
-
- do
- {
- do4:
- a0 = ((op_t *) srcp)[0];
- ((op_t *) dstp)[0] = MERGE (a2, sh_1, a3, sh_2);
- do3:
- a1 = ((op_t *) srcp)[1];
- ((op_t *) dstp)[1] = MERGE (a3, sh_1, a0, sh_2);
- do2:
- a2 = ((op_t *) srcp)[2];
- ((op_t *) dstp)[2] = MERGE (a0, sh_1, a1, sh_2);
- do1:
- a3 = ((op_t *) srcp)[3];
- ((op_t *) dstp)[3] = MERGE (a1, sh_1, a2, sh_2);
-
- srcp += 4 * OPSIZ;
- dstp += 4 * OPSIZ;
- len -= 4;
- }
- while (len != 0);
-
- /* This is the right position for do0. Please don't move
- it into the loop. */
- do0:
- ((op_t *) dstp)[0] = MERGE (a2, sh_1, a3, sh_2);
-}
-
void *memcpy (void *dstpp, const void *srcpp, size_t len)
{
unsigned long int dstp = (long int) dstpp;