1276789Sdim//===-- floatundidf.S - Implement __floatundidf for x86_64 ----------------===//
2276789Sdim//
3276789Sdim//                     The LLVM Compiler Infrastructure
4276789Sdim//
5276789Sdim// This file is dual licensed under the MIT and the University of Illinois Open
6276789Sdim// Source Licenses. See LICENSE.TXT for details.
7276789Sdim//
8276789Sdim//===----------------------------------------------------------------------===//
9276789Sdim//
10276789Sdim// This file implements __floatundidf for the compiler_rt library.
11276789Sdim//
12276789Sdim//===----------------------------------------------------------------------===//
13276789Sdim
14276789Sdim#include "../assembly.h"
15276789Sdim
16276789Sdim// double __floatundidf(du_int a);
17276789Sdim
18276789Sdim#ifdef __x86_64__
19276789Sdim
20276789SdimCONST_SECTION
21276789Sdim
22276789Sdim	.balign 16
23276789Sdimtwop52:
24276789Sdim	.quad 0x4330000000000000
25276789Sdim
26276789Sdim	.balign 16
27276789Sdimtwop84_plus_twop52:
28276789Sdim	.quad 0x4530000000100000
29276789Sdim
30276789Sdim	.balign 16
31276789Sdimtwop84:
32276789Sdim	.quad 0x4530000000000000
33276789Sdim
34276789Sdim#define REL_ADDR(_a)	(_a)(%rip)
35276789Sdim
36276789Sdim.text
37276789Sdim.balign 4
38276789SdimDEFINE_COMPILERRT_FUNCTION(__floatundidf)
39276789Sdim	movd	%edi,							%xmm0 // low 32 bits of a
40276789Sdim	shrq	$32,							%rdi  // high 32 bits of a
41276789Sdim	orq		REL_ADDR(twop84),				%rdi  // 0x1p84 + a_hi (no rounding occurs)
42276789Sdim	orpd	REL_ADDR(twop52),				%xmm0 // 0x1p52 + a_lo (no rounding occurs)
43276789Sdim	movd	%rdi,							%xmm1
44276789Sdim	subsd	REL_ADDR(twop84_plus_twop52),	%xmm1 // a_hi - 0x1p52 (no rounding occurs)
45276789Sdim	addsd	%xmm1,							%xmm0 // a_hi + a_lo   (round happens here)
46276789Sdim	ret
47276789SdimEND_COMPILERRT_FUNCTION(__floatundidf)
48276789Sdim
49276789Sdim#endif // __x86_64__
50