patch-2.0.21-2.1.0 linux/arch/m68k/lib/memset.c

• Lines: 69
• Date: Wed Sep 25 10:47:40 1996
• Orig file: lx2.0/v2.0.21/linux/arch/m68k/lib/memset.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file lx2.0/v2.0.21/linux/arch/m68k/lib/memset.c linux/arch/m68k/lib/memset.c
@@ -0,0 +1,68 @@
+#include <linux/types.h>
+
+void * memset(void * s, int c, size_t count)
+{
+  void *xs = s;
+  size_t temp, temp1;
+
+  if (!count)
+    return xs;
+  c &= 0xff;
+  c |= c << 8;
+  c |= c << 16;
+  if ((long) s & 1)
+    {
+      char *cs = s;
+      *cs++ = c;
+      s = cs;
+      count--;
+    }
+  if (count > 2 && (long) s & 2)
+    {
+      short *ss = s;
+      *ss++ = c;
+      s = ss;
+      count -= 2;
+    }
+  temp = count >> 2;
+  if (temp)
+    {
+      long *ls = s;
+
+      __asm__ __volatile__("movel %1,%2\n\t"
+			   "andw  #7,%2\n\t"
+			   "lsrl  #3,%1\n\t"
+			   "negw  %2\n\t"
+			   "jmp   %%pc@(2f,%2:w:2)\n\t"
+			   "1:\t"
+			   "movel %3,%0@+\n\t"
+			   "movel %3,%0@+\n\t"
+			   "movel %3,%0@+\n\t"
+			   "movel %3,%0@+\n\t"
+			   "movel %3,%0@+\n\t"
+			   "movel %3,%0@+\n\t"
+			   "movel %3,%0@+\n\t"
+			   "movel %3,%0@+\n\t"
+			   "2:\t"
+			   "dbra  %1,1b\n\t"
+			   "clrw  %1\n\t"
+			   "subql #1,%1\n\t"
+			   "jpl   1b\n\t"
+			   : "=a" (ls), "=d" (temp), "=&d" (temp1)
+			   : "d" (c), "0" (ls), "1" (temp)
+			   );
+      s = ls;
+    }
+  if (count & 2)
+    {
+      short *ss = s;
+      *ss++ = c;
+      s = ss;
+    }
+  if (count & 1)
+    {
+      char *cs = s;
+      *cs = c;
+    }
+  return xs;
+}