VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/math/trunc.asm@ 93115

Last change on this file since 93115 was 93115, checked in by vboxsync, 3 years ago

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File size: 1.8 KB
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1; $Id: trunc.asm 93115 2022-01-01 11:31:46Z vboxsync $
2;; @file
3; IPRT - No-CRT trunc - AMD64 & X86.
4;
5
6;
7; Copyright (C) 2006-2022 Oracle Corporation
8;
9; This file is part of VirtualBox Open Source Edition (OSE), as
10; available from http://www.virtualbox.org. This file is free software;
11; you can redistribute it and/or modify it under the terms of the GNU
12; General Public License (GPL) as published by the Free Software
13; Foundation, in version 2 as it comes in the "COPYING" file of the
14; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16;
17; The contents of this file may alternatively be used under the terms
18; of the Common Development and Distribution License Version 1.0
19; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20; VirtualBox OSE distribution, in which case the provisions of the
21; CDDL are applicable instead of those of the GPL.
22;
23; You may elect to license modified versions of this file under the
24; terms and conditions of either the GPL or the CDDL or both.
25;
26
27
28%include "iprt/asmdefs.mac"
29
30BEGINCODE
31
32;;
33; Round to truncated integer value.
34; @returns 32-bit: st(0) 64-bit: xmm0
35; @param rd 32-bit: [ebp + 8] 64-bit: xmm0
36BEGINPROC RT_NOCRT(trunc)
37 push xBP
38 mov xBP, xSP
39 sub xSP, 10h
40
41%ifdef RT_ARCH_AMD64
42 movsd [xSP], xmm0
43 fld qword [xSP]
44%else
45 fld qword [xBP + xCB*2]
46%endif
47
48 ; Make it truncate up by modifying the fpu control word.
49 fstcw [xBP - 10h]
50 mov eax, [xBP - 10h]
51 or eax, 00c00h
52 mov [xBP - 08h], eax
53 fldcw [xBP - 08h]
54
55 ; Round ST(0) to integer.
56 frndint
57
58 ; Restore the fpu control word.
59 fldcw [xBP - 10h]
60
61%ifdef RT_ARCH_AMD64
62 fstp qword [xSP]
63 movsd xmm0, [xSP]
64%endif
65 leave
66 ret
67ENDPROC RT_NOCRT(trunc)
68
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