> As far as a fast_memmove() for Alpha goes, you said you were using a
> hacked memcpy and this is probably what we should do (and maybe
> install it as the global one) unless someone else wants to write a
> real one.
Here's a patch against 2.3.3. This should get rid of the stalling when
doing ncurses stuff on a TGA console.
It's untested, but it compiles. I'm compiling a kernel with it now, but
it's compiling over NFS, with 32Mb and no swap, so things are progressing
slowly.
As I say, I hacked together something like this the other day and it
worked.
Tim.
*/
--- linux-2.3.3/arch/alpha/lib/memcpy.c Tue Apr 7 16:05:05 1998
+++ linux/arch/alpha/lib/memcpy.c Wed May 19 16:55:50 1999
@@ -116,3 +116,80 @@
/* For backward modules compatibility, define __memcpy. */
asm("__memcpy = memcpy; .globl __memcpy");
+
+/* memmove. This can be optimised some more. */
+static void __memmove_aligned (void *dest, const void *src, size_t n)
+{
+ size_t c;
+ unsigned long *s, *d;
+
+ if (dest <= src) {
+ while (((unsigned long) dest) & 7) {
+ if (n <= 0) return;
+ n--;
+ * (char *) dest++ = * (char *) src++;
+ }
+
+ c = n / 8;
+ s = (unsigned long *) src;
+ d = (unsigned long *) dest;
+ while (c--)
+ *d++ = *s++;
+
+ dest = d;
+ src = s;
+ n %= 8;
+ while (n--)
+ * (char *) dest++ = * (char *) src++;
+
+ return;
+ }
+
+ dest += n;
+ src += n;
+ while (((unsigned long) dest) & 7) {
+ if (n <= 0) return;
+ n--;
+ * (char *) --dest = * (char *) --src;
+ }
+
+ c = n / 8;
+ s = (unsigned long *) src;
+ d = (unsigned long *) dest;
+ while (c--)
+ *--d = *--s;
+
+ n %= 8;
+ dest = d;
+ src = s;
+ while (n--)
+ * (char *) --dest = * (char *) --src;
+}
+
+static void __memmove_unaligned (void *dest, const void *src, size_t n)
+{
+ /* No optimisation. */
+ char *d, *s;
+ if (dest <= src) {
+ d = (char *) dest;
+ s = (char *) src;
+ while (n--)
+ *d++ = *s++;
+ return;
+ }
+
+ d = (char *) dest + n;
+ s = (char *) src + n;
+ while (n--)
+ *--d = *--s;
+}
+
+void *memmove (void *dest, const void *src, size_t n)
+{
+ if (!(((unsigned long) dest ^ (unsigned long) src) & 7)) {
+ __memmove_aligned (dest, src, n);
+ return dest;
+ }
+ __memmove_unaligned (dest, src, n);
+ return dest;
+}
--- linux-2.3.3/include/asm-alpha/string.h Sun Aug 9 20:09:06 1998
+++ linux/include/asm-alpha/string.h Wed May 19 22:24:36 1999
@@ -43,6 +43,7 @@
#define __HAVE_ARCH_STRCHR
#define __HAVE_ARCH_STRRCHR
#define __HAVE_ARCH_STRLEN
+#define __HAVE_ARCH_MEMMOVE
/* The following routine is like memset except that it writes 16-bit
aligned values. The DEST and COUNT parameters must be even for
-
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