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|
; $Id: remainder.asm $
;; @file
; IPRT - No-CRT remainder - 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
;
%define RT_ASM_WITH_SEH64
%include "iprt/asmdefs.mac"
%include "iprt/x86.mac"
BEGINCODE
;;
; See SUS.
; @returns st(0) / xmm0
; @param rd1 [ebp + 8h] xmm0 Dividend.
; @param rd2 [ebp + 10h] xmm1 Divisor.
RT_NOCRT_BEGINPROC remainder
push xBP
SEH64_PUSH_xBP
mov xBP, xSP
SEH64_SET_FRAME_xBP 0
%ifdef RT_ARCH_AMD64
sub xSP, 20h
SEH64_ALLOCATE_STACK 20h
%endif
SEH64_END_PROLOGUE
;
; Load the dividend into st0 and divisor into st1.
;
%ifdef RT_ARCH_AMD64
movsd [xBP - 20h], xmm1
movsd [xBP - 10h], xmm0
fld qword [xBP - 20h]
fld qword [xBP - 10h]
%else
fld qword [ebp + 10h]
fld qword [ebp + 08h]
%endif
;
; The fprem1 only does between 32 and 64 rounds, so we have to loop
; here till we've got a final result. We count down in ECX to
; avoid getting stuck here...
;
mov ecx, 2048 / 32 + 4
.again:
fprem1
fstsw ax
test ah, (X86_FSW_C2 >> 8)
jz .done
dec cx
jnz .again
%ifdef RT_STRICT
int3
%endif
;
; Return the result.
;
.done:
fstp st1
%ifdef RT_ARCH_AMD64
fstp qword [rsp]
movsd xmm0, [rsp]
%endif
leave
ret
ENDPROC RT_NOCRT(remainder)
|
