1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * IEEE754 floating point
 4 * double precision internal header file
 5 */
 6/*
 7 * MIPS floating point support
 8 * Copyright (C) 1994-2000 Algorithmics Ltd.
 9 */
10
11#include <linux/compiler.h>
12
13#include "ieee754int.h"
14
15#define assert(expr) ((void)0)
16
17#define DP_EBIAS	1023
18#define DP_EMIN		(-1022)
19#define DP_EMAX		1023
20#define DP_FBITS	52
21#define DP_MBITS	52
22
23#define DP_MBIT(x)	((u64)1 << (x))
24#define DP_HIDDEN_BIT	DP_MBIT(DP_FBITS)
25#define DP_SIGN_BIT	DP_MBIT(63)
26
27#define DPSIGN(dp)	(dp.sign)
28#define DPBEXP(dp)	(dp.bexp)
29#define DPMANT(dp)	(dp.mant)
30
31static inline int ieee754dp_finite(union ieee754dp x)
32{
33	return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS;
34}
35
36/* 3bit extended double precision sticky right shift */
37#define XDPSRS(v,rs)	\
38	((rs > (DP_FBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0))
39
40#define XDPSRSX1() \
41	(xe++, (xm = (xm >> 1) | (xm & 1)))
42
43#define XDPSRS1(v)	\
44	(((v) >> 1) | ((v) & 1))
45
46/* 32bit * 32bit => 64bit unsigned integer multiplication */
47#define DPXMULT(x, y)	((u64)(x) * (u64)y)
48
49/* convert denormal to normalized with extended exponent */
50#define DPDNORMx(m,e) \
51	while ((m >> DP_FBITS) == 0) { m <<= 1; e--; }
52#define DPDNORMX	DPDNORMx(xm, xe)
53#define DPDNORMY	DPDNORMx(ym, ye)
54#define DPDNORMZ	DPDNORMx(zm, ze)
55
56static inline union ieee754dp builddp(int s, int bx, u64 m)
57{
58	union ieee754dp r;
59
60	assert((s) == 0 || (s) == 1);
61	assert((bx) >= DP_EMIN - 1 + DP_EBIAS
62	       && (bx) <= DP_EMAX + 1 + DP_EBIAS);
63	assert(((m) >> DP_FBITS) == 0);
64
65	r.sign = s;
66	r.bexp = bx;
67	r.mant = m;
68
69	return r;
70}
71
72extern union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp);
73extern union ieee754dp ieee754dp_format(int, int, u64);

 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * IEEE754 floating point
 4 * double precision internal header file
 5 */
 6/*
 7 * MIPS floating point support
 8 * Copyright (C) 1994-2000 Algorithmics Ltd.
 9 */
10
11#include <linux/compiler.h>
12
13#include "ieee754int.h"
14
15#define assert(expr) ((void)0)
16
17#define DP_EBIAS	1023
18#define DP_EMIN		(-1022)
19#define DP_EMAX		1023
20#define DP_FBITS	52
21#define DP_MBITS	52
22
23#define DP_MBIT(x)	((u64)1 << (x))
24#define DP_HIDDEN_BIT	DP_MBIT(DP_FBITS)
25#define DP_SIGN_BIT	DP_MBIT(63)
26
27#define DPSIGN(dp)	(dp.sign)
28#define DPBEXP(dp)	(dp.bexp)
29#define DPMANT(dp)	(dp.mant)
30
31static inline int ieee754dp_finite(union ieee754dp x)
32{
33	return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS;
34}
35
36/* 3bit extended double precision sticky right shift */
37#define XDPSRS(v,rs)	\
38	((rs > (DP_FBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0))
39
40#define XDPSRSX1() \
41	(xe++, (xm = (xm >> 1) | (xm & 1)))
42
43#define XDPSRS1(v)	\
44	(((v) >> 1) | ((v) & 1))
45
46/* 32bit * 32bit => 64bit unsigned integer multiplication */
47#define DPXMULT(x, y)	((u64)(x) * (u64)y)
48
49/* convert denormal to normalized with extended exponent */
50#define DPDNORMx(m,e) \
51	while ((m >> DP_FBITS) == 0) { m <<= 1; e--; }
52#define DPDNORMX	DPDNORMx(xm, xe)
53#define DPDNORMY	DPDNORMx(ym, ye)
54#define DPDNORMZ	DPDNORMx(zm, ze)
55
56static inline union ieee754dp builddp(int s, int bx, u64 m)
57{
58	union ieee754dp r;
59
60	assert((s) == 0 || (s) == 1);
61	assert((bx) >= DP_EMIN - 1 + DP_EBIAS
62	       && (bx) <= DP_EMAX + 1 + DP_EBIAS);
63	assert(((m) >> DP_FBITS) == 0);
64
65	r.sign = s;
66	r.bexp = bx;
67	r.mant = m;
68
69	return r;
70}
71
72extern union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp);
73extern union ieee754dp ieee754dp_format(int, int, u64);