shithub: riscv

ref: 4e00cf6b1798fc95b3ccad8cb66a3e80c96b2786
dir: /sys/src/ape/lib/ap/alpha/tas.s/

View raw version 
TEXT	tas(SB), $-8
	MOVQ	R0, R1			/* l */
tas1:
	MOVLL	(R1), R0		/* l->key */
	BNE	R0, tas2
	MOVQ	$1, R2
	MOVLC	R2, (R1)		/* l->key = 1 */
	BEQ	R2, tas1		/* write failed, try again? */
tas2:
	RET