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|
; $Id: powf.asm $
;; @file
; IPRT - No-CRT powf - 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
extern NAME(rtNoCrtMathPowCore)
;;
; Compute the rfBase to the power of rfExp.
; @returns st(0) / xmm0
; @param rfBase [xSP + xCB*2] / xmm0
; @param rfExp [xSP + xCB*2 + 4] / xmm1
;
RT_NOCRT_BEGINPROC powf
push xBP
SEH64_PUSH_xBP
mov xBP, xSP
SEH64_SET_FRAME_xBP 0
push xBX
SEH64_PUSH_GREG rbx
sub xSP, 30h - xCB
SEH64_ALLOCATE_STACK 30h - xCB
SEH64_END_PROLOGUE
;
; Load rdBase into st1 and rdExp into st0.
;
%ifdef RT_ARCH_AMD64
movss [xBP - 20h], xmm0
fld dword [xBP - 20h]
fxam
fnstsw ax
mov dx, ax ; dx=fxam(base)
movss [xBP - 30h], xmm1
fld dword [xBP - 30h]
%else
fld dword [xBP + xCB*2]
fxam
fnstsw ax
mov dx, ax ; dx=fxam(base)
fld dword [xBP + xCB*2 + RTLRD_CB]
%endif
;
; Call common worker for the calculation.
;
mov ebx, 1 ; float
call NAME(rtNoCrtMathPowCore)
;
; Normally, we return with eax==0 and we have to load the result
; from st0 and into xmm0.
;
cmp eax, 0
jne .return_input_reg
fstp dword [xSP - 30h]
movss xmm0, [xSP - 30h]
.return:
lea xSP, [xBP - xCB]
pop xBX
leave
ret
;
; But sometimes, like if we have NaN or other special inputs, we should
; return the input as-is and ditch the st0 value.
;
.return_input_reg:
ffreep st0
cmp eax, 2
je .return_exp
%ifdef RT_STRICT
cmp eax, 1
je .return_base
int3
%endif
.return_base:
jmp .return
.return_exp:
movss xmm0, xmm1
jmp .return
ENDPROC RT_NOCRT(powf)
|
