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
19 beqi r6, result_is_zero /* multiply
20 bgeid r5, r5_pos
21 xor r4, r5, r6 /* get the sign of
22 rsubi r5, r5, 0 /* make r5 positive
23 r5_pos:
24 bgei r6, r6_pos
25 rsubi r6, r6, 0 /* make r6 positive
26 r6_pos:
27 bri l1
28 l2:
29 add r5, r5, r5
30 l1:
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
39 negateresult:
40 rtsd r15, 8
41 rsub r3, r3, r0
42 result_is_zero:
43 rtsd r15, 8
44 addi r3, r0, 0
45
46 .size __mulsi3, . - __mulsi3
47 .end __mulsi3
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.