1#ifdef LIBC_SCCS 2 .asciz "@(#)urem.s 5.2 (Berkeley) 03/09/86" 3#endif LIBC_SCCS 4 5/* 6 * urem - unsigned remainder for vax-11 7 * 8 * arguments: dividend, divisor 9 * result: remainder 10 * uses r0-r2 11 * 12 * if 1 < divisor <= 2147483647, zero-extend the dividend 13 * to 64 bits and let ediv do the work. If the divisor is 1, 14 * ediv will overflow if bit 31 of the dividend is on, so 15 * just return 0. If the divisor is 0, do the ediv also, 16 * so it will generate the proper exception. All other values 17 * of the divisor have bit 31 on: in this case the remainder 18 * must be the dividend if divisor > dividend, and the dividend 19 * minus the divisor otherwise. The comparison must be unsigned. 20 */ 21#include "DEFS.h" 22 23ASENTRY(urem, 0) 24 movl 4(ap),r0 /* dividend */ 25 movl 8(ap),r2 /* divisor */ 26 jeql 1f /* if divisor=0, force exception */ 27 cmpl r2,$1 /* if divisor <= 1 (signed), */ 28 jleq 2f /* no division is necessary */ 291: 30 clrl r1 /* zero-extend the dividend */ 31 ediv r2,r0,r2,r0 /* divide. q->r2 (discarded), r->r0 */ 32 ret 332: 34 jneq 1f /* if divisor=1, return 0 */ 35 clrl r0 /* (because doing the divide will overflow */ 36 ret /* if the dividend has its high bit on) */ 371: 38 cmpl r0,r2 /* if dividend < divisor (unsigned) */ 39 jlssu 1f /* remainder is dividend */ 40 subl2 r2,r0 /* else remainder is dividend - divisor */ 411: 42 ret 43 44/* 45 * aurem - unsigned remainder for vax-11 46 * 47 * arguments: *dividend, divisor 48 * result: remainder in r0 and *dividend 49 * uses r0-r2 50 */ 51#include "DEFS.h" 52 53ASENTRY(aurem, 0) 54 movl *4(ap),r0 /* dividend */ 55 movl 8(ap),r2 /* divisor */ 56 jeql 1f /* if divisor=0, force exception */ 57 cmpl r2,$1 /* if divisor <= 1 (signed), */ 58 jleq 2f /* no division is necessary */ 591: 60 clrl r1 /* zero-extend the dividend */ 61 ediv r2,r0,r2,r0 /* divide. q->r2 (discarded), r->r0 */ 62 movl r0,*4(ap) /* save result */ 63 ret 642: 65 jneq 1f /* if divisor=1, return 0 */ 66 clrl r0 /* (because doing the divide will overflow */ 67 clrl *4(ap) /* if the dividend has its high bit on) */ 68 ret 691: 70 cmpl r0,r2 /* if dividend < divisor (unsigned) */ 71 jlssu 1f /* remainder is dividend */ 72 subl2 r2,r0 /* else remainder is dividend - divisor */ 731: 74 movl r0,*4(ap) /* save result */ 75 ret 76