fp64_square.S

/* Copyright (c) 2018-2020  Uwe Bissinger
   Based on 32bit floating point arithmetic routines which are:
   Copyright (c) 2005  Anatoly Sokolov  <aesok@post.ru>
   Copyright (c) 2006  Dmitry Xmelkov
   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:

   * Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.
   * Neither the name of the copyright holders nor the names of
     contributors may be used to endorse or promote products derived
     from this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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/* $Id$ */

#include "fp64def.h"
#include "asmdef.h"

/* float64_t fp64_square (float64_t A);
     The fp64_square() function returns square of A.
 */

FUNCTION fp64_square
ENTRY fp64_square
	XCALL _U(__fp64_pushB)		; preserve registers
	push rBE1
	push rBE0

	XCALL _U(__fp64_movBA)		; B = A = x
	XCALL	_U(__fp64_mulsd3x)	; A * B = x * x

	pop rBE0
	pop rBE1
	XJMP _U(__fp64_popBret)		; restore registers and return

ENDFUNC