extended_cpdo.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3    NetWinder Floating Point Emulator
  4    (c) Rebel.COM, 1998,1999
  5
  6    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
  7
  8*/
  9
 10#include "fpa11.h"
 11#include "softfloat.h"
 12#include "fpopcode.h"
 13
 14floatx80 floatx80_exp(floatx80 Fm);
 15floatx80 floatx80_ln(floatx80 Fm);
 16floatx80 floatx80_sin(floatx80 rFm);
 17floatx80 floatx80_cos(floatx80 rFm);
 18floatx80 floatx80_arcsin(floatx80 rFm);
 19floatx80 floatx80_arctan(floatx80 rFm);
 20floatx80 floatx80_log(floatx80 rFm);
 21floatx80 floatx80_tan(floatx80 rFm);
 22floatx80 floatx80_arccos(floatx80 rFm);
 23floatx80 floatx80_pow(floatx80 rFn, floatx80 rFm);
 24floatx80 floatx80_pol(floatx80 rFn, floatx80 rFm);
 25
 26static floatx80 floatx80_rsf(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
 27{
 28	return floatx80_sub(roundData, rFm, rFn);
 29}
 30
 31static floatx80 floatx80_rdv(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
 32{
 33	return floatx80_div(roundData, rFm, rFn);
 34}
 35
 36static floatx80 (*const dyadic_extended[16])(struct roundingData*, floatx80 rFn, floatx80 rFm) = {
 37	[ADF_CODE >> 20] = floatx80_add,
 38	[MUF_CODE >> 20] = floatx80_mul,
 39	[SUF_CODE >> 20] = floatx80_sub,
 40	[RSF_CODE >> 20] = floatx80_rsf,
 41	[DVF_CODE >> 20] = floatx80_div,
 42	[RDF_CODE >> 20] = floatx80_rdv,
 43	[RMF_CODE >> 20] = floatx80_rem,
 44
 45	/* strictly, these opcodes should not be implemented */
 46	[FML_CODE >> 20] = floatx80_mul,
 47	[FDV_CODE >> 20] = floatx80_div,
 48	[FRD_CODE >> 20] = floatx80_rdv,
 49};
 50
 51static floatx80 floatx80_mvf(struct roundingData *roundData, floatx80 rFm)
 52{
 53	return rFm;
 54}
 55
 56static floatx80 floatx80_mnf(struct roundingData *roundData, floatx80 rFm)
 57{
 58	rFm.high ^= 0x8000;
 59	return rFm;
 60}
 61
 62static floatx80 floatx80_abs(struct roundingData *roundData, floatx80 rFm)
 63{
 64	rFm.high &= 0x7fff;
 65	return rFm;
 66}
 67
 68static floatx80 (*const monadic_extended[16])(struct roundingData*, floatx80 rFm) = {
 69	[MVF_CODE >> 20] = floatx80_mvf,
 70	[MNF_CODE >> 20] = floatx80_mnf,
 71	[ABS_CODE >> 20] = floatx80_abs,
 72	[RND_CODE >> 20] = floatx80_round_to_int,
 73	[URD_CODE >> 20] = floatx80_round_to_int,
 74	[SQT_CODE >> 20] = floatx80_sqrt,
 75	[NRM_CODE >> 20] = floatx80_mvf,
 76};
 77
 78unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
 79{
 80	FPA11 *fpa11 = GET_FPA11();
 81	floatx80 rFm;
 82	unsigned int Fm, opc_mask_shift;
 83
 84	Fm = getFm(opcode);
 85	if (CONSTANT_FM(opcode)) {
 86		rFm = getExtendedConstant(Fm);
 87	} else {
 88		switch (fpa11->fType[Fm]) {
 89		case typeSingle:
 90			rFm = float32_to_floatx80(fpa11->fpreg[Fm].fSingle);
 91			break;
 92
 93		case typeDouble:
 94			rFm = float64_to_floatx80(fpa11->fpreg[Fm].fDouble);
 95			break;
 96
 97		case typeExtended:
 98			rFm = fpa11->fpreg[Fm].fExtended;
 99			break;
100
101		default:
102			return 0;
103		}
104	}
105
106	opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
107	if (!MONADIC_INSTRUCTION(opcode)) {
108		unsigned int Fn = getFn(opcode);
109		floatx80 rFn;
110
111		switch (fpa11->fType[Fn]) {
112		case typeSingle:
113			rFn = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
114			break;
115
116		case typeDouble:
117			rFn = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
118			break;
119
120		case typeExtended:
121			rFn = fpa11->fpreg[Fn].fExtended;
122			break;
123
124		default:
125			return 0;
126		}
127
128		if (dyadic_extended[opc_mask_shift]) {
129			rFd->fExtended = dyadic_extended[opc_mask_shift](roundData, rFn, rFm);
130		} else {
131			return 0;
132		}
133	} else {
134		if (monadic_extended[opc_mask_shift]) {
135			rFd->fExtended = monadic_extended[opc_mask_shift](roundData, rFm);
136		} else {
137			return 0;
138		}
139	}
140
141	return 1;
142}