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; $Id: trunc.asm $
;; @file
; IPRT - No-CRT trunc - AMD64 & X86.
;
;
; Copyright (C) 2006-2019 Oracle Corporation
;
; This file is part of VirtualBox Open Source Edition (OSE), as
; available from http://www.virtualbox.org. This file is free software;
; you can redistribute it and/or modify it under the terms of the GNU
; General Public License (GPL) as published by the Free Software
; Foundation, in version 2 as it comes in the "COPYING" file of the
; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
; VirtualBox OSE 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.
;
%include "iprt/asmdefs.mac"
BEGINCODE
;;
; Round to truncated integer value.
; @returns 32-bit: st(0) 64-bit: xmm0
; @param rd 32-bit: [ebp + 8] 64-bit: xmm0
BEGINPROC RT_NOCRT(trunc)
push xBP
mov xBP, xSP
sub xSP, 10h
%ifdef RT_ARCH_AMD64
movsd [xSP], xmm0
fld qword [xSP]
%else
fld qword [xBP + xCB*2]
%endif
; Make it truncate up by modifying the fpu control word.
fstcw [xBP - 10h]
mov eax, [xBP - 10h]
or eax, 00c00h
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 qword [xSP]
movsd xmm0, [xSP]
%endif
leave
ret
ENDPROC RT_NOCRT(trunc)
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