floatundixf.S revision 276851 
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// long double __floatundixf(du_int a);16
7
8#ifdef __i386__
9
10CONST_SECTION
11
12	.balign 16
13twop52:
14	.quad 0x4330000000000000
15
16	.balign 16
17twop84_plus_twop52_neg:
18	.quad 0xc530000000100000
19
20	.balign 16
21twop84:
22	.quad 0x4530000000000000
23
24#define REL_ADDR(_a)	(_a)-0b(%eax)
25
26.text
27.balign 4
28DEFINE_COMPILERRT_FUNCTION(__floatundixf)
29	calll	0f
300:	popl	%eax
31	movss	8(%esp),			%xmm0	// hi 32 bits of input
32	movss	4(%esp),			%xmm1	// lo 32 bits of input
33	orpd	REL_ADDR(twop84),	%xmm0	// 2^84 + hi (as a double)
34	orpd	REL_ADDR(twop52),	%xmm1	// 2^52 + lo (as a double)
35	addsd	REL_ADDR(twop84_plus_twop52_neg),	%xmm0	// hi - 2^52 (no rounding occurs)
36	movsd	%xmm1,				4(%esp)
37	fldl	4(%esp)
38	movsd	%xmm0,				4(%esp)
39	faddl	4(%esp)
40	ret
41END_COMPILERRT_FUNCTION(__floatundixf)
42
43#endif // __i386__
44