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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#include <linux/linkage.h>
   3
   4/*
   5 * Multiply operation for 32 bit integers.
   6 *      Input : Operand1 in Reg r5
   7 *              Operand2 in Reg r6
   8 *      Output: Result [op1 * op2] in Reg r3
   9 */
  10        .text
  11        .globl  __mulsi3
  12        .type __mulsi3,  @function
  13        .ent __mulsi3
  14
  15__mulsi3:
  16        .frame  r1, 0, r15
  17        add     r3, r0, r0
  18        beqi    r5, result_is_zero /* multiply by zero */
  19        beqi    r6, result_is_zero /* multiply by zero */
  20        bgeid   r5, r5_pos
  21        xor     r4, r5, r6 /* get the sign of the result */
  22        rsubi   r5, r5, 0 /* make r5 positive */
  23r5_pos:
  24        bgei    r6, r6_pos
  25        rsubi   r6, r6, 0 /* make r6 positive */
  26r6_pos:
  27        bri     l1
  28l2:
  29        add     r5, r5, r5
  30l1:
  31        srl     r6, r6
  32        addc    r7, r0, r0
  33        beqi    r7, l2
  34        bneid   r6, l2
  35        add     r3, r3, r5
  36        blti    r4, negateresult
  37        rtsd    r15, 8
  38        nop
  39negateresult:
  40        rtsd    r15, 8
  41        rsub    r3, r3, r0
  42result_is_zero:
  43        rtsd    r15, 8
  44        addi    r3, r0, 0
  45
  46.size __mulsi3,  . - __mulsi3
  47.end __mulsi3
  48