#include "asm.h"

// int int64 muls64_m(int a, int b);
	.text
	.global muls64_m
muls64_m:
	movel	4(sp), d0
	movel	8(sp), d1

        movel   #0x20, macsr    // Put MAC in fraction mode
        subl    a0, a0
        movel   a0, acc         // Zero acc
        macl    d0, d1          // Form upper half of product
        mulul   d0, d1          // Form lower half
	movel	macsr, ccr	// Overflow?
	bvsb	1f		// Yes
        movel   acc, d0
        asrl    #1, d0          // Correct for binary point position
	rts

1:	movel	#0x40000000, d0	// Correct for overflow
	rts