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-rw-r--r--src/VBox/Runtime/common/math/floorf.asm78
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diff --git a/src/VBox/Runtime/common/math/floorf.asm b/src/VBox/Runtime/common/math/floorf.asm
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+; $Id: floorf.asm $
+;; @file
+; IPRT - No-CRT floorf - AMD64 & X86.
+;
+
+;
+; Copyright (C) 2006-2023 Oracle and/or its affiliates.
+;
+; This file is part of VirtualBox base platform packages, as
+; available from https://www.virtualbox.org.
+;
+; This program is free software; you can redistribute it and/or
+; modify it under the terms of the GNU General Public License
+; as published by the Free Software Foundation, in version 3 of the
+; License.
+;
+; This program is distributed in the hope that it will be useful, but
+; WITHOUT ANY WARRANTY; without even the implied warranty of
+; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+; General Public License for more details.
+;
+; You should have received a copy of the GNU General Public License
+; along with this program; if not, see <https://www.gnu.org/licenses>.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+; in the VirtualBox distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+;
+
+%include "iprt/asmdefs.mac"
+
+BEGINCODE
+
+;;
+; Compute the largest integral value not greater than rf.
+; @returns st(0)
+; @param rf 32-bit: [ebp + 8] 64-bit: xmm0
+RT_NOCRT_BEGINPROC floorf
+ push xBP
+ mov xBP, xSP
+ sub xSP, 10h
+
+%ifdef RT_ARCH_AMD64
+ movss [xSP], xmm0
+ fld dword [xSP]
+%else
+ fld dword [xBP + xCB*2]
+%endif
+
+ ; Make it round down by modifying the fpu control word.
+ fstcw [xBP - 10h]
+ mov eax, [xBP - 10h]
+ or eax, 00400h
+ and eax, 0f7ffh
+ mov [xBP - 08h], eax
+ fldcw [xBP - 08h]
+
+ ; Round ST(0) to integer.
+ frndint
+
+ ; Restore the fpu control word.
+ fldcw [xBP - 10h]
+
+%ifdef RT_ARCH_AMD64
+ fstp dword [xSP]
+ movss xmm0, [xSP]
+%endif
+ leave
+ ret
+ENDPROC RT_NOCRT(floorf)
+