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Extend bit and endian operators.
This commit is contained in:
Andrew Cagney
parent
17bbcaad92
commit
b3e426bc3e
@ -1,3 +1,20 @@
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Tue Mar 4 09:35:56 1997 Andrew Cagney <cagney@kremvax.cygnus.com>
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* sim-alu.h (ALU_SUB_CA, ALU*_SUB_CA): New alu operation.
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* sim-bits.h, sim-bits-n.h, sim-bits.c (LSMASKED*): New macro's
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extract the tail or least signifiant bits from an integer of the
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specified size.
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* sim-bits.h, sim-bits.c: Clean up conditionally compiled #if
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WITH_TARGET_BITSIZE so that the compilation will fail when an
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unsupported bitsize value is defined.
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(INSERTED*): Convert to functions.
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(EXTRACTED*): Ditto.
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(SIGN_EXTEND, SEXT): Change to more terse name.
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Tue Mar 4 09:35:56 1997 Andrew Cagney <cagney@kremvax.cygnus.com>
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* sim-inline.h: Allow explicit control over which .c files will be
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@ -10,6 +27,21 @@ Tue Mar 4 09:35:56 1997 Andrew Cagney <cagney@kremvax.cygnus.com>
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icache.c, idecode.c, semantics.c or support.c. Those names are
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not generally applicable.
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Thu Feb 27 10:17:23 1997 Andrew Cagney <cagney@kremvax.cygnus.com>
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* sim-bits.c, sim-bits-n.h (new): Split sim-bits.c into two parts
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in a fashion similar to sim-endian-n.
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* sim-endian.h: (H_word, L_word, AL_*, VL_*): Extend to include
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both value and address macro's.
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Tue Feb 25 18:51:57 1997 Andrew Cagney <cagney@kremvax.cygnus.com>
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* sim-alu.h (ALU16_BEGIN, ALU16_SET, ...): Fill in.
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* sim-endian.h (L_word, H_word): Replace MS2W_4, LS2W_4 with more
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generic L_word, H_word macro's.
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Thu Feb 20 18:36:55 1997 Andrew Cagney <cagney@critters.cygnus.com>
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* sim-basics.h: Borrow code from ppc directory.
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145
sim/common/sim-bits-n.h
Normal file
145
sim/common/sim-bits-n.h
Normal file
@ -0,0 +1,145 @@
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/* This file is part of the program psim.
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Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
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Copyright (C) 1997, Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef N
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#error "N must be #defined"
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#endif
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/* NOTE: See end of file for #undef */
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#define unsignedN XCONCAT2(unsigned,N)
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#define signedN XCONCAT2(signed,N)
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#define MASKEDn XCONCAT2(MASKED,N)
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#define MASKn XCONCAT2(MASK,N)
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#define LSMASKEDn XCONCAT2(LSMASKED,N)
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#define EXTRACTEDn XCONCAT2(EXTRACTED,N)
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#define INSERTEDn XCONCAT2(INSERTED,N)
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#define ROTn XCONCAT2(ROT,N)
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#define ROTLn XCONCAT2(ROTL,N)
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#define ROTRn XCONCAT2(ROTR,N)
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#define SEXTn XCONCAT2(SEXT,N)
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INLINE_SIM_BITS\
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(unsignedN)
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MASKEDn(unsignedN word,
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unsigned start,
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unsigned stop)
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{
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return (word & MASKn(start, stop));
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}
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INLINE_SIM_BITS\
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(unsignedN)
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LSMASKEDn(unsignedN word,
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unsigned nr_bits)
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{
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return (word & MASKn(N - nr_bits, N - 1));
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}
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INLINE_SIM_BITS\
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(unsignedN)
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EXTRACTEDn(unsignedN val,
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unsigned start,
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unsigned stop)
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{
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return LSMASKEDn((((unsignedN)(val)) >> (N - stop - 1)),
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stop - start + 1);
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}
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INLINE_SIM_BITS\
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(unsignedN)
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INSERTEDn(unsignedN val,
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unsigned start,
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unsigned stop)
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{
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return (((unsignedN)(val)
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<< _MAKE_SHIFT(N, stop))
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& MASKn(start, stop));
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}
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INLINE_SIM_BITS\
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(unsignedN)
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ROTn(unsignedN val,
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int shift)
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{
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unsignedN result;
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if (shift > 0)
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return ROTRn(val, shift);
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else if (shift < 0)
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return ROTLn(val, -shift);
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else
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return val;
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}
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INLINE_SIM_BITS\
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(unsignedN)
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ROTLn(unsignedN val,
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unsigned shift)
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{
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unsignedN result;
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ASSERT(shift <= N);
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result = (((val) << (shift)) | ((val) >> ((N)-(shift))));
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return result;
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}
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INLINE_SIM_BITS\
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(unsignedN)
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ROTRn(unsignedN val,
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unsigned shift)
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{
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unsignedN result;
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ASSERT(shift <= N);
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result = (((val) >> (shift)) | ((val) << ((N)-(shift))));
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return result;
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}
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INLINE_SIM_BITS\
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(unsignedN)
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SEXTn(signedN val,
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unsigned sign_bit)
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{
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/* make the sign-bit most significant and then smear it back into
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position */
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ASSERT(sign_bit < N);
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return (val << sign_bit) >> sign_bit;
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}
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/* NOTE: See start of file for #define */
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#undef SEXTn
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#undef ROTLn
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#undef ROTRn
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#undef ROTn
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#undef INSERTEDn
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#undef EXTRACTEDn
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#undef LSMASKEDn
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#undef MASKn
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#undef MASKEDn
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#undef signedN
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#undef unsignedN
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