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 */
  22 r5_pos:
  23         bgei    r6, r6_pos
  24         rsubi   r6, r6, 0 /* make r6 positive */
  25 r6_pos:
  26         bri     l1
  27 l2:
  28         add     r5, r5, r5
  29 l1:
  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
  38 negateresult:
  39         rtsd    r15, 8
  40         rsub    r3, r3, r0
  41 result_is_zero:
  42         rtsd    r15, 8
  43         addi    r3, r0, 0
  44
  45 .size __mulsi3,  . - __mulsi3
  46 .end __mulsi3