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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
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