PageRenderTime 24ms CodeModel.GetById 9ms app.highlight 9ms RepoModel.GetById 2ms app.codeStats 0ms

/arch/arm/nwfpe/fpopcode.c

https://bitbucket.org/evzijst/gittest
C | 90 lines | 61 code | 6 blank | 23 comment | 0 complexity | 215937d138b5840a94b7dfdd7c953fd2 MD5 | raw file
 1/*
 2    NetWinder Floating Point Emulator
 3    (c) Rebel.COM, 1998,1999
 4
 5    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
 6
 7    This program is free software; you can redistribute it and/or modify
 8    it under the terms of the GNU General Public License as published by
 9    the Free Software Foundation; either version 2 of the License, or
10    (at your option) any later version.
11
12    This program is distributed in the hope that it will be useful,
13    but WITHOUT ANY WARRANTY; without even the implied warranty of
14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15    GNU General Public License for more details.
16
17    You should have received a copy of the GNU General Public License
18    along with this program; if not, write to the Free Software
19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20*/
21
22#include <linux/config.h>
23#include "fpa11.h"
24#include "softfloat.h"
25#include "fpopcode.h"
26#include "fpsr.h"
27#include "fpmodule.h"
28#include "fpmodule.inl"
29
30#ifdef CONFIG_FPE_NWFPE_XP
31const floatx80 floatx80Constant[] = {
32	{0x0000, 0x0000000000000000ULL},	/* extended 0.0 */
33	{0x3fff, 0x8000000000000000ULL},	/* extended 1.0 */
34	{0x4000, 0x8000000000000000ULL},	/* extended 2.0 */
35	{0x4000, 0xc000000000000000ULL},	/* extended 3.0 */
36	{0x4001, 0x8000000000000000ULL},	/* extended 4.0 */
37	{0x4001, 0xa000000000000000ULL},	/* extended 5.0 */
38	{0x3ffe, 0x8000000000000000ULL},	/* extended 0.5 */
39	{0x4002, 0xa000000000000000ULL}		/* extended 10.0 */
40};
41#endif
42
43const float64 float64Constant[] = {
44	0x0000000000000000ULL,	/* double 0.0 */
45	0x3ff0000000000000ULL,	/* double 1.0 */
46	0x4000000000000000ULL,	/* double 2.0 */
47	0x4008000000000000ULL,	/* double 3.0 */
48	0x4010000000000000ULL,	/* double 4.0 */
49	0x4014000000000000ULL,	/* double 5.0 */
50	0x3fe0000000000000ULL,	/* double 0.5 */
51	0x4024000000000000ULL	/* double 10.0 */
52};
53
54const float32 float32Constant[] = {
55	0x00000000,		/* single 0.0 */
56	0x3f800000,		/* single 1.0 */
57	0x40000000,		/* single 2.0 */
58	0x40400000,		/* single 3.0 */
59	0x40800000,		/* single 4.0 */
60	0x40a00000,		/* single 5.0 */
61	0x3f000000,		/* single 0.5 */
62	0x41200000		/* single 10.0 */
63};
64
65/* condition code lookup table
66 index into the table is test code: EQ, NE, ... LT, GT, AL, NV
67 bit position in short is condition code: NZCV */
68static const unsigned short aCC[16] = {
69	0xF0F0,			// EQ == Z set
70	0x0F0F,			// NE
71	0xCCCC,			// CS == C set
72	0x3333,			// CC
73	0xFF00,			// MI == N set
74	0x00FF,			// PL
75	0xAAAA,			// VS == V set
76	0x5555,			// VC
77	0x0C0C,			// HI == C set && Z clear
78	0xF3F3,			// LS == C clear || Z set
79	0xAA55,			// GE == (N==V)
80	0x55AA,			// LT == (N!=V)
81	0x0A05,			// GT == (!Z && (N==V))
82	0xF5FA,			// LE == (Z || (N!=V))
83	0xFFFF,			// AL always
84	0			// NV
85};
86
87unsigned int checkCondition(const unsigned int opcode, const unsigned int ccodes)
88{
89	return (aCC[opcode >> 28] >> (ccodes >> 28)) & 1;
90}