VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/math/rintf.asm@ 96407

Last change on this file since 96407 was 96407, checked in by vboxsync, 2 years ago

scm copyright and license note update

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1; $Id: rintf.asm 96407 2022-08-22 17:43:14Z vboxsync $
2;; @file
3; IPRT - No-CRT rintf - AMD64 & X86.
4;
5
6;
7; Copyright (C) 2022 Oracle and/or its affiliates.
8;
9; This file is part of VirtualBox base platform packages, as
10; available from https://www.virtualbox.org.
11;
12; This program is free software; you can redistribute it and/or
13; modify it under the terms of the GNU General Public License
14; as published by the Free Software Foundation, in version 3 of the
15; License.
16;
17; This program is distributed in the hope that it will be useful, but
18; WITHOUT ANY WARRANTY; without even the implied warranty of
19; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20; General Public License for more details.
21;
22; You should have received a copy of the GNU General Public License
23; along with this program; if not, see <https://www.gnu.org/licenses>.
24;
25; The contents of this file may alternatively be used under the terms
26; of the Common Development and Distribution License Version 1.0
27; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28; in the VirtualBox distribution, in which case the provisions of the
29; CDDL are applicable instead of those of the GPL.
30;
31; You may elect to license modified versions of this file under the
32; terms and conditions of either the GPL or the CDDL or both.
33;
34; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35;
36
37
38%define RT_ASM_WITH_SEH64
39%include "iprt/asmdefs.mac"
40%include "iprt/x86.mac"
41
42
43BEGINCODE
44
45;;
46; Round to integer value according to current rounding mode.
47;
48; ASSUME FCW and MXCSR are in sync for AMD64.
49;
50; @returns st(0) / xmm0
51; @param rd [rbp + 08h] / xmm0
52RT_NOCRT_BEGINPROC rintf
53 push xBP
54 SEH64_PUSH_xBP
55 mov xBP, xSP
56 SEH64_SET_FRAME_xBP 0
57%ifdef RT_ARCH_AMD64
58 sub xSP, 10h
59 SEH64_ALLOCATE_STACK 10h
60%endif
61 SEH64_END_PROLOGUE
62
63 ;
64 ; Load the value into st(0). This messes up SNaN values.
65 ;
66%ifdef RT_ARCH_AMD64
67 movss dword [xSP], xmm0
68 fld dword [xSP]
69%else
70 fld dword [xBP + xCB*2]
71%endif
72
73 ;
74 ; Return immediately if NaN or infinity.
75 ;
76 fxam
77 fstsw ax
78 test ax, X86_FSW_C0 ; C0 is set for NaN, Infinity and Empty register. The latter is not the case.
79 jz .input_ok
80%ifdef RT_ARCH_AMD64
81 ffreep st0 ; return the xmm0 register value unchanged, as FLD changes SNaN to QNaN.
82%endif
83 jmp .return
84.input_ok:
85
86 ;
87 ; Do the job and return.
88 ;
89 frndint
90
91%ifdef RT_ARCH_AMD64
92 fstp dword [xSP]
93 movss xmm0, dword [xSP]
94%endif
95.return:
96 leave
97 ret
98ENDPROC RT_NOCRT(rintf)
99
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