; $Id: sqrtf.asm 96112 2022-08-08 11:53:27Z vboxsync $
;; @file
; IPRT - No-CRT sqrtf - AMD64 & X86.
;

;
; Copyright (C) 2022 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.
;

%define RT_ASM_WITH_SEH64
%include "iprt/asmdefs.mac"

BEGINCODE

;;
; Square root - the fast not entirely C standard confirming version.
;
; @returns  st(0) / xmm0
; @param    r32     [rbp + 08h] / xmm0
RT_NOCRT_BEGINPROC sqrtf
        push    xBP
        SEH64_PUSH_xBP
        mov     xBP, xSP
        SEH64_SET_FRAME_xBP 0
        SEH64_END_PROLOGUE

%ifdef RT_ARCH_AMD64
        sqrtss  xmm0, xmm0
%else
        fld     dword [xBP + xCB*2]
        fsqrt
        ;; @todo rounding?
%endif

        leave
        ret
ENDPROC   RT_NOCRT(sqrtf)