TEXT ·Store64(SB), NOSPLIT, $0-12
	NO_LOCAL_POINTERS
	MOVL	ptr+0(FP), AX
	TESTL	$7, AX
	JZ	2(PC)
	CALL	·panicUnaligned(SB)
	// MOVQ and EMMS were introduced on the Pentium MMX.
	MOVQ	val+4(FP), M0
	MOVQ	M0, (AX)
	EMMS
	// This is essentially a no-op, but it provides required memory fencing.
	// It can be replaced with MFENCE, but MFENCE was introduced only on the Pentium4 (SSE2).