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| /* SPDX-License-Identifier: GPL-2.0 */
| #include <linux/linkage.h>
|
| /*
| * Multiply operation for 32 bit integers.
| * Input : Operand1 in Reg r5
| * Operand2 in Reg r6
| * Output: Result [op1 * op2] in Reg r3
| */
| .text
| .globl __mulsi3
| .type __mulsi3, @function
| .ent __mulsi3
|
| __mulsi3:
| .frame r1, 0, r15
| add r3, r0, r0
| beqi r5, result_is_zero /* multiply by zero */
| beqi r6, result_is_zero /* multiply by zero */
| bgeid r5, r5_pos
| xor r4, r5, r6 /* get the sign of the result */
| rsubi r5, r5, 0 /* make r5 positive */
| r5_pos:
| bgei r6, r6_pos
| rsubi r6, r6, 0 /* make r6 positive */
| r6_pos:
| bri l1
| l2:
| add r5, r5, r5
| l1:
| srl r6, r6
| addc r7, r0, r0
| beqi r7, l2
| bneid r6, l2
| add r3, r3, r5
| blti r4, negateresult
| rtsd r15, 8
| nop
| negateresult:
| rtsd r15, 8
| rsub r3, r3, r0
| result_is_zero:
| rtsd r15, 8
| addi r3, r0, 0
|
| .size __mulsi3, . - __mulsi3
| .end __mulsi3
|
|
