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/*
* reg_constant.c
*
* All of the constant FPU_REGs
*
*
* Copyright (C) 1992,1993,1994
* W. Metzenthen, 22 Parker St, Ormond, Vic 3163,
* Australia. E-mail billm@vaxc.cc.monash.edu.au
* All rights reserved.
*
* This copyright notice covers the redistribution and use of the
* FPU emulator developed by W. Metzenthen. It covers only its use
* in the 386BSD, FreeBSD and NetBSD operating systems. Any other
* use is not permitted under this copyright.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must include information specifying
* that source code for the emulator is freely available and include
* either:
* a) an offer to provide the source code for a nominal distribution
* fee, or
* b) list at least two alternative methods whereby the source
* can be obtained, e.g. a publically accessible bulletin board
* and an anonymous ftp site from which the software can be
* downloaded.
* 3. All advertising materials specifically mentioning features or use of
* this emulator must acknowledge that it was developed by W. Metzenthen.
* 4. The name of W. Metzenthen may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED ``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
* W. METZENTHEN BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*
* The purpose of this copyright, based upon the Berkeley copyright, is to
* ensure that the covered software remains freely available to everyone.
*
* The software (with necessary differences) is also available, but under
* the terms of the GNU copyleft, for the Linux operating system and for
* the djgpp ms-dos extender.
*
* W. Metzenthen June 1994.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <machine/pcb.h>
#include <gnu/i386/fpemul/fpu_emu.h>
#include <gnu/i386/fpemul/fpu_system.h>
#include <gnu/i386/fpemul/status_w.h>
FPU_REG CONST_1 = {SIGN_POS, TW_Valid, EXP_BIAS,
0x00000000, 0x80000000};
static FPU_REG CONST_L2T = {SIGN_POS, TW_Valid, EXP_BIAS + 1,
0xcd1b8afe, 0xd49a784b};
static FPU_REG CONST_L2E = {SIGN_POS, TW_Valid, EXP_BIAS,
0x5c17f0bc, 0xb8aa3b29};
FPU_REG CONST_PI = {SIGN_POS, TW_Valid, EXP_BIAS + 1,
0x2168c235, 0xc90fdaa2};
FPU_REG CONST_PI2 = {SIGN_POS, TW_Valid, EXP_BIAS,
0x2168c235, 0xc90fdaa2};
FPU_REG CONST_PI4 = {SIGN_POS, TW_Valid, EXP_BIAS - 1,
0x2168c235, 0xc90fdaa2};
static FPU_REG CONST_LG2 = {SIGN_POS, TW_Valid, EXP_BIAS - 2,
0xfbcff799, 0x9a209a84};
FPU_REG CONST_LN2 = {SIGN_POS, TW_Valid, EXP_BIAS - 1,
0xd1cf79ac, 0xb17217f7};
/* Only the sign (and tag) is used in internal zeroes */
FPU_REG CONST_Z = {SIGN_POS, TW_Zero, 0, 0x0, 0x0};
/* Only the sign and significand (and tag) are used in internal NaNs */
/* The 80486 never generates one of these
FPU_REG CONST_SNAN = { SIGN_POS, TW_NaN, EXP_OVER, 0x00000001, 0x80000000 };
*/
/* This is the real indefinite QNaN */
FPU_REG CONST_QNaN = {SIGN_NEG, TW_NaN, EXP_OVER, 0x00000000, 0xC0000000};
/* Only the sign (and tag) is used in internal infinities */
FPU_REG CONST_INF = {SIGN_POS, TW_Infinity, EXP_OVER, 0x00000000, 0x80000000};
static void
fld_const(FPU_REG * c)
{
FPU_REG *st_new_ptr;
if (STACK_OVERFLOW) {
stack_overflow();
return;
}
push();
reg_move(c, FPU_st0_ptr);
status_word &= ~SW_C1;
}
static void
fld1(void)
{
fld_const(&CONST_1);
}
static void
fldl2t(void)
{
fld_const(&CONST_L2T);
}
static void
fldl2e(void)
{
fld_const(&CONST_L2E);
}
static void
fldpi(void)
{
fld_const(&CONST_PI);
}
static void
fldlg2(void)
{
fld_const(&CONST_LG2);
}
static void
fldln2(void)
{
fld_const(&CONST_LN2);
}
static void
fldz(void)
{
fld_const(&CONST_Z);
}
static FUNC constants_table[] = {
fld1, fldl2t, fldl2e, fldpi, fldlg2, fldln2, fldz, Un_impl
};
void
fconst(void)
{
(constants_table[FPU_rm]) ();
}
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