BSD 4_3 release

[unix-history] / usr / src / lib / libc / vax / gen / udiv.s

diff --git a/usr/src/lib/libc/vax/gen/udiv.s b/usr/src/lib/libc/vax/gen/udiv.s
index d53b9b3..c7d1daf 100644 (file)
--- a/usr/src/lib/libc/vax/gen/udiv.s
+++ b/usr/src/lib/libc/vax/gen/udiv.s
@@ -1,4 +1,6 @@
-/*     udiv.s  4.2     83/06/27        */
+#ifdef LIBC_SCCS
+       .asciz  "@(#)udiv.s     5.2 (Berkeley) 3/9/86"
+#endif LIBC_SCCS

 
 /*
  * udiv - unsigned division for vax-11
 
 /*
  * udiv - unsigned division for vax-11


@@ -19,7 +21,7 @@
 
 #include "DEFS.h"
 
 
 #include "DEFS.h"
 

-ASENTRY(udiv)
+ASENTRY(udiv, 0)

        movl    4(ap),r0        /* dividend */
        movl    8(ap),r2        /* divisor */
        jeql    1f              /* if divisor=0, force exception */
        movl    4(ap),r0        /* dividend */
        movl    8(ap),r2        /* divisor */
        jeql    1f              /* if divisor=0, force exception */


@@ -39,3 +41,37 @@ ASENTRY(udiv)
        movl    $1,r0           /* dividend >= divisor, return 1 */
 1:     
        ret
        movl    $1,r0           /* dividend >= divisor, return 1 */
 1:     
        ret

+
+/*
+ * audiv - unsigned division for vax-11
+ *
+ * arguments: *dividend, divisor.
+ * result: quotient in r0 and *dividend.
+ * uses r0-r2
+ */
+
+#include "DEFS.h"
+
+ASENTRY(audiv, 0)
+       movl    *4(ap),r0       /* dividend */
+       movl    8(ap),r2        /* divisor */
+       jeql    1f              /* if divisor=0, force exception */
+       cmpl    r2,$1           /* if divisor <= 1 (signed), */
+       jleq    2f              /*  no division is necessary */
+1:
+       clrl    r1              /* zero-extend the dividend */
+       ediv    r2,r0,r0,r2     /* divide.  q->r0, r->r2 (discarded) */
+       movl    r0,*4(ap)       /* save result */
+       ret
+2:
+       jeql    1f              /* if divisor=1, return dividend */
+       cmpl    r0,r2           /* unsigned comparison between */
+       jgequ   2f              /*  dividend and divisor */
+       clrl    r0              /* dividend < divisor, return 0 */
+       clrl    *4(ap)          /* save result */
+       ret
+2:
+       movl    $1,r0           /* dividend >= divisor, return 1 */
+1:
+       movl    r0,*4(ap)       /* save result */
+       ret