1 /* This file is part of the program psim.
3 Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, see <http://www.gnu.org/licenses/>.
25 /* bit manipulation routines:
27 Bit numbering: The bits are numbered according to the PowerPC
28 convention - the left most (or most significant) is bit 0 while the
29 right most (least significant) is bit 1.
31 Size convention: Each macro is in three forms - <MACRO>32 which
32 operates in 32bit quantity (bits are numbered 0..31); <MACRO>64
33 which operates using 64bit quantites (and bits are numbered 0..64);
34 and <MACRO> which operates using the bit size of the target
35 architecture (bits are still numbered 0..63), with 32bit
36 architectures ignoring the first 32bits having bit 32 as the most
39 BIT*(POS): Quantity with just 1 bit set.
41 MASK*(FIRST, LAST): Create a constant bit mask of the specified
42 size with bits [FIRST .. LAST] set.
44 MASKED*(VALUE, FIRST, LAST): Masks out all but bits [FIRST
47 LSMASKED*(VALUE, FIRST, LAST): Like MASKED - LS bit is zero.
49 EXTRACTED*(VALUE, FIRST, LAST): Masks out bits [FIRST .. LAST] but
50 also right shifts the masked value so that bit LAST becomes the
51 least significant (right most).
53 LSEXTRACTED*(VALUE, FIRST, LAST): Same as extracted - LS bit is
56 SHUFFLED**(VALUE, OLD, NEW): Mask then move a single bit from OLD
59 MOVED**(VALUE, OLD_FIRST, OLD_LAST, NEW_FIRST, NEW_LAST): Moves
60 things around so that bits OLD_FIRST..OLD_LAST are masked then
61 moved to NEW_FIRST..NEW_LAST.
63 INSERTED*(VALUE, FIRST, LAST): Takes VALUE and `inserts' the (LAST
64 - FIRST + 1) least significant bits into bit positions [ FIRST
65 .. LAST ]. This is almost the complement to EXTRACTED.
67 IEA_MASKED(SHOULD_MASK, ADDR): Convert the address to the targets
68 natural size. If in 32bit mode, discard the high 32bits.
70 EXTENDED(VALUE): Convert VALUE (32bits of it) to the targets
71 natural size. If in 64bit mode, sign extend the value.
73 ALIGN_*(VALUE): Round upwards the value so that it is aligned.
75 FLOOR_*(VALUE): Truncate the value so that it is aligned.
77 ROTL*(VALUE, NR_BITS): Return the value rotated by NR_BITS
81 #define _MAKE_SHIFT(WIDTH, pos) ((WIDTH) - 1 - (pos))
84 #if (WITH_TARGET_WORD_MSB == 0)
85 #define _LSB_POS(WIDTH, SHIFT) (WIDTH - 1 - SHIFT)
87 #define _LSB_POS(WIDTH, SHIFT) (SHIFT)
92 #define _BITn(WIDTH, pos) (((natural##WIDTH)(1)) \
93 << _MAKE_SHIFT(WIDTH, pos))
95 #define BIT4(POS) (1 << _MAKE_SHIFT(4, POS))
96 #define BIT5(POS) (1 << _MAKE_SHIFT(5, POS))
97 #define BIT8(POS) (1 << _MAKE_SHIFT(8, POS))
98 #define BIT10(POS) (1 << _MAKE_SHIFT(10, POS))
99 #define BIT32(POS) _BITn(32, POS)
100 #define BIT64(POS) _BITn(64, POS)
102 #if (WITH_TARGET_WORD_BITSIZE == 64)
103 #define BIT(POS) BIT64(POS)
105 #define BIT(POS) (((POS) < 32) ? 0 : _BITn(32, (POS)-32))
110 #define _MASKn(WIDTH, START, STOP) \
111 (((((unsigned##WIDTH)0) - 1) \
112 >> (WIDTH - ((STOP) - (START) + 1))) \
113 << (WIDTH - 1 - (STOP)))
115 #define MASK32(START, STOP) _MASKn(32, START, STOP)
116 #define MASK64(START, STOP) _MASKn(64, START, STOP)
118 /* Multi-bit mask on least significant bits */
120 #define _LSMASKn(WIDTH, FIRST, LAST) _MASKn (WIDTH, \
121 _LSB_POS (WIDTH, FIRST), \
122 _LSB_POS (WIDTH, LAST))
124 #define LSMASK64(FIRST, LAST) _LSMASKn (64, (FIRST), (LAST))
126 #if (WITH_TARGET_WORD_BITSIZE == 64)
127 #define MASK(START, STOP) \
128 (((START) <= (STOP)) \
129 ? _MASKn(64, START, STOP) \
130 : (_MASKn(64, 0, STOP) \
131 | _MASKn(64, START, 63)))
133 #define MASK(START, STOP) \
134 (((START) <= (STOP)) \
138 (START) < 32 ? 0 : (START) - 32, \
141 (START) < 32 ? 0 : (START) - 32, \
151 /* mask the required bits, leaving them in place */
154 (unsigned32
) MASKED32
160 (unsigned64
) MASKED64
166 (unsigned_word
) MASKED
172 (unsigned64
) LSMASKED64
178 /* extract the required bits aligning them with the lsb */
179 #define _EXTRACTEDn(WIDTH, WORD, START, STOP) \
180 ((((natural##WIDTH)(WORD)) >> (WIDTH - (STOP) - 1)) \
181 & _MASKn(WIDTH, WIDTH-1+(START)-(STOP), WIDTH-1))
183 /* #define EXTRACTED10(WORD, START, STOP) _EXTRACTEDn(10, WORD, START, STOP) */
184 #define EXTRACTED32(WORD, START, STOP) _EXTRACTEDn(32, WORD, START, STOP)
185 #define EXTRACTED64(WORD, START, STOP) _EXTRACTEDn(64, WORD, START, STOP)
188 (unsigned_word
) EXTRACTED
194 (unsigned64
) LSEXTRACTED64
199 /* move a single bit around */
200 /* NB: the wierdness (N>O?N-O:0) is to stop a warning from GCC */
201 #define _SHUFFLEDn(N, WORD, OLD, NEW) \
203 ? (((unsigned##N)(WORD) \
204 >> (((NEW) > (OLD)) ? ((NEW) - (OLD)) : 0)) \
205 & MASK32((NEW), (NEW))) \
206 : (((unsigned##N)(WORD) \
207 << (((OLD) > (NEW)) ? ((OLD) - (NEW)) : 0)) \
208 & MASK32((NEW), (NEW))))
210 #define SHUFFLED32(WORD, OLD, NEW) _SHUFFLEDn(32, WORD, OLD, NEW)
211 #define SHUFFLED64(WORD, OLD, NEW) _SHUFFLEDn(64, WORD, OLD, NEW)
213 #define SHUFFLED(WORD, OLD, NEW) _SHUFFLEDn(_word, WORD, OLD, NEW)
216 /* move a group of bits around */
217 #define _INSERTEDn(N, WORD, START, STOP) \
218 (((natural##N)(WORD) << _MAKE_SHIFT(N, STOP)) & _MASKn(N, START, STOP))
220 #define INSERTED32(WORD, START, STOP) _INSERTEDn(32, WORD, START, STOP)
221 #define INSERTED64(WORD, START, STOP) _INSERTEDn(64, WORD, START, STOP)
224 (unsigned_word
) INSERTED
230 /* depending on MODE return a 64bit or 32bit (sign extended) value */
231 #if (WITH_TARGET_WORD_BITSIZE == 64)
232 #define EXTENDED(X) ((signed64)(signed32)(X))
234 #define EXTENDED(X) (X)
238 /* memory alignment macro's */
239 #define _ALIGNa(A,X) (((X) + ((A) - 1)) & ~((A) - 1))
240 #define _FLOORa(A,X) ((X) & ~((A) - 1))
242 #define ALIGN_8(X) _ALIGNa(8, X)
243 #define ALIGN_16(X) _ALIGNa(16, X)
245 #define ALIGN_PAGE(X) _ALIGNa(0x1000, X)
246 #define FLOOR_PAGE(X) ((X) & ~(0x1000 - 1))
249 /* bit bliting macro's */
250 #define BLIT32(V, POS, BIT) \
257 #define MBLIT32(V, LO, HI, VAL) \
259 (V) = (((V) & ~MASK32((LO), (HI))) \
260 | INSERTED32(VAL, LO, HI)); \
264 /* some rotate functions to make things easier
266 NOTE: These are functions not macro's as the latter tickles bugs in
269 #define _ROTLn(N, VAL, SHIFT) \
270 (((VAL) << (SHIFT)) | ((VAL) >> ((N)-(SHIFT))))
283 #if (BITS_INLINE & INCLUDE_MODULE)
287 #endif /* _BITS_H_ */
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