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>

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;