LXR linux/arch/microblaze/lib/mulsi3.S

   1#include <linux/linkage.h>
   2
   3/*
   4 * Multiply operation for 32 bit integers.
   5 *      Input : Operand1 in Reg r5
   6 *              Operand2 in Reg r6
   7 *      Output: Result [op1 * op2] in Reg r3
   8 */
   9        .text
  10        .globl  __mulsi3
  11        .type __mulsi3,  @function
  12        .ent __mulsi3
  13
  14__mulsi3:
  15        .frame  r1, 0, r15
  16        add     r3, r0, r0
  17        beqi    r5, result_is_zero /* multiply by zero */
  18        beqi    r6, result_is_zero /* multiply by zero */
  19        bgeid   r5, r5_pos
  20        xor     r4, r5, r6 /* get the sign of the result */
  21        rsubi   r5, r5, 0 /* make r5 positive */
  22r5_pos:
  23        bgei    r6, r6_pos
  24        rsubi   r6, r6, 0 /* make r6 positive */
  25r6_pos:
  26        bri     l1
  27l2:
  28        add     r5, r5, r5
  29l1:
  30        srl     r6, r6
  31        addc    r7, r0, r0
  32        beqi    r7, l2
  33        bneid   r6, l2
  34        add     r3, r3, r5
  35        blti    r4, negateresult
  36        rtsd    r15, 8
  37        nop
  38negateresult:
  39        rtsd    r15, 8
  40        rsub    r3, r3, r0
  41result_is_zero:
  42        rtsd    r15, 8
  43        addi    r3, r0, 0
  44
  45.size __mulsi3,  . - __mulsi3
  46.end __mulsi3
  47