1// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
2// See https://llvm.org/LICENSE.txt for license information.
3// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
4
5#include "../assembly.h"
6
7// xf_float __floatundixf(du_int a);16
8
9#ifdef __i386__
10
11CONST_SECTION
12
13 .balign 16
14twop52:
15 .quad 0x4330000000000000
16
17 .balign 16
18twop84_plus_twop52_neg:
19 .quad 0xc530000000100000
20
21 .balign 16
22twop84:
23 .quad 0x4530000000000000
24
25#define REL_ADDR(_a) (_a)-0b(%eax)
26
27.text
28.balign 4
29DEFINE_COMPILERRT_FUNCTION(__floatundixf)
30 calll 0f
310: popl %eax
32 movss 8(%esp), %xmm0 // hi 32 bits of input
33 movss 4(%esp), %xmm1 // lo 32 bits of input
34 orpd REL_ADDR(twop84), %xmm0 // 2^84 + hi (as a double)
35 orpd REL_ADDR(twop52), %xmm1 // 2^52 + lo (as a double)
36 addsd REL_ADDR(twop84_plus_twop52_neg), %xmm0 // hi - 2^52 (no rounding occurs)
37 movsd %xmm1, 4(%esp)
38 fldl 4(%esp)
39 movsd %xmm0, 4(%esp)
40 faddl 4(%esp)
41 ret
42END_COMPILERRT_FUNCTION(__floatundixf)
43
44#endif // __i386__
45
46NO_EXEC_STACK_DIRECTIVE
47
48

source code of compiler-rt/lib/builtins/i386/floatundixf.S