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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/microblaze/lib/mulsi3.S
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/* SPDX-License-Identifier: GPL-2.0 */

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#include <linux/linkage.h>

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/*

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 * Multiply operation for 32 bit integers.

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 *	Input :	Operand1 in Reg r5

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 *		Operand2 in Reg r6

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 *	Output: Result [op1 * op2] in Reg r3

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 */

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	.text

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	.globl	__mulsi3

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	.type __mulsi3,  @function

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	.ent __mulsi3

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__mulsi3:

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	.frame	r1, 0, r15

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	add	r3, r0, r0

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	beqi	r5, result_is_zero /* multiply by zero */

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	beqi	r6, result_is_zero /* multiply by zero */

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	bgeid	r5, r5_pos

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	xor	r4, r5, r6 /* get the sign of the result */

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	rsubi	r5, r5, 0 /* make r5 positive */

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r5_pos:

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	bgei	r6, r6_pos

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	rsubi	r6, r6, 0 /* make r6 positive */

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r6_pos:

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	bri	l1

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l2:

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	add	r5, r5, r5

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l1:

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	srl	r6, r6

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	addc	r7, r0, r0

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	beqi	r7, l2

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	bneid	r6, l2

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	add	r3, r3, r5

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	blti	r4, negateresult

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	rtsd	r15, 8

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	nop

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negateresult:

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	rtsd	r15, 8

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	rsub	r3, r3, r0

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result_is_zero:

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	rtsd	r15, 8

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	addi	r3, r0, 0

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.size __mulsi3,  . - __mulsi3

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.end __mulsi3

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