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Diffstat (limited to 'src/VBox/Runtime/common/math/floorf.asm')
-rw-r--r-- | src/VBox/Runtime/common/math/floorf.asm | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/math/floorf.asm b/src/VBox/Runtime/common/math/floorf.asm new file mode 100644 index 00000000..c6855b08 --- /dev/null +++ b/src/VBox/Runtime/common/math/floorf.asm @@ -0,0 +1,78 @@ +; $Id: floorf.asm $ +;; @file +; IPRT - No-CRT floorf - AMD64 & X86. +; + +; +; Copyright (C) 2006-2022 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) + |