1// This file is dual licensed under the MIT and the University of Illinois Open
2// Source Licenses. See LICENSE.TXT for details.
3
4#include "../assembly.h"
5
6// di_int __muldi3(di_int a, di_int b);
7
8#ifdef __i386__
9
10.text
11.align 4
12DEFINE_COMPILERRT_FUNCTION(__muldi3)
13	pushl	%ebx
14	movl  16(%esp),		%eax	// b.lo
15	movl  12(%esp),		%ecx	// a.hi
16	imull	%eax,		%ecx	// b.lo * a.hi
17
18	movl   8(%esp),		%edx	// a.lo
19	movl  20(%esp),		%ebx	// b.hi
20	imull	%edx,		%ebx	// a.lo * b.hi
21
22	mull	%edx				// EDX:EAX = a.lo * b.lo
23	addl	%ecx,		%ebx	// EBX = (a.lo*b.hi + a.hi*b.lo)
24	addl	%ebx,		%edx
25
26	popl	%ebx
27	retl
28
29#endif // __i386__
30