sim/common/sim-alu.h

   1 /*  This file is part of the program psim.
   2
   3     Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
   4     Copyright (C) 1997, Free Software Foundation, Inc.
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19
  20     */
  21
  22
  23 #ifndef _SIM_ALU_H_
  24 #define _SIM_ALU_H_
  25
  26 #include "symcat.h"
  27
  28
  29 /* INTEGER ALU MODULE:
  30
  31    This module provides an implementation of 2's complement arithmetic
  32    including the recording of carry and overflow status bits.
  33
  34
  35    EXAMPLE:
  36
  37    Code using this module includes it into sim-main.h and then, as a
  38    convention, defines macro's ALU*_END that records the result of any
  39    aritmetic performed.  Ex:
  40
  41         #include "sim-alu.h"
  42         #define ALU32_END(RES) \
  43         (RES) = ALU32_OVERFLOW_RESULT; \
  44         carry = ALU32_HAD_CARRY_BORROW; \
  45         overflow = ALU32_HAD_OVERFLOW
  46
  47    The macro's are then used vis:
  48
  49         {
  50           ALU32_BEGIN (GPR[i]);
  51           ALU32_ADDC (GPR[j]);
  52           ALU32_END (GPR[k]);
  53         }
  54
  55
  56    NOTES:
  57
  58    Macros exist for efficiently computing 8, 16, 32 and 64 bit
  59    arithmetic - ALU8_*, ALU16_*, ....  In addition, according to
  60    TARGET_WORD_BITSIZE a set of short-hand macros are defined - ALU_*
  61
  62    Initialization:
  63
  64         ALU*_BEGIN(ACC): Declare initialize the ALU accumulator with ACC.
  65
  66    Results:
  67
  68         The calculation of the final result may be computed a number
  69         of different ways.  Three different overflow macro's are
  70         defined, the most efficient one to use depends on which other
  71         outputs from the alu are being used.
  72
  73         ALU*_RESULT: Generic ALU result output.
  74
  75         ALU*_HAD_OVERFLOW: Returns a nonzero value if signed overflow
  76         occured.
  77
  78         ALU*_OVERFLOW_RESULT: If the macro ALU*_HAD_OVERFLOW is being
  79         used this is the most efficient result available.  Ex:
  80
  81                 #define ALU16_END(RES) \
  82                 if (ALU16_HAD_OVERFLOW) \
  83                   sim_engine_halt (...); \
  84                 (RES) = ALU16_OVERFLOW_RESULT
  85
  86         ALU*_HAD_CARRY_BORROW: Returns a nonzero value if unsigned
  87         overflow or underflow (also refered to as carry and borrow)
  88         occured.
  89
  90         ALU*_CARRY_BORROW_RESULT: If the macro ALU*_HAD_CARRY_BORROW is being
  91         used this is the most efficient result available.  Ex:
  92
  93                 #define ALU64_END(RES) \
  94                 State.carry = ALU64_HAD_CARRY_BORROW; \
  95                 (RES) = ALU64_CARRY_BORROW_RESULT
  96
  97
  98    Addition:
  99
 100         ALU*_ADD(VAL): Add VAL to the ALU accumulator.  Record any
 101         overflow as well as the final result.
 102
 103         ALU*_ADDC(VAL): Add VAL to the ALU accumulator.  Record any
 104         carry-out or overflow as well as the final result.
 105
 106         ALU*_ADDC_C(VAL,CI): Add VAL and CI (carry-in).  Record any
 107         carry-out or overflow as well as the final result.
 108
 109    Subtraction:
 110
 111         ALU*_SUB(VAL): Subtract VAL from the ALU accumulator.  Record
 112         any underflow as well as the final result.
 113
 114         ALU*_SUBC(VAL): Subtract VAL from the ALU accumulator using
 115         negated addition.  Record any underflow or carry-out as well
 116         as the final result.
 117
 118         ALU*_SUBB(VAL): Subtract VAL from the ALU accumulator using
 119         direct subtraction (ACC+~VAL+1).  Record any underflow or
 120         borrow-out as well as the final result.
 121
 122         ALU*_SUBC_X(VAL,CI): Subtract VAL and CI (carry-in) from the
 123         ALU accumulator using extended negated addition (ACC+~VAL+CI).
 124         Record any underflow or carry-out as well as the final result.
 125
 126         ALU*_SUBB_B(VAL,BI): Subtract VAL and BI (borrow-in) from the
 127         ALU accumulator using direct subtraction.  Record any
 128         underflow or borrow-out as well as the final result.
 129
 130
 131  */
 132
 133
 134
 135 /* Twos complement aritmetic - addition/subtraction - carry/borrow
 136    (or you thought you knew the answer to 0-0)
 137
 138
 139
 140    Notation and Properties:
 141
 142
 143    Xn denotes the value X stored in N bits.
 144
 145    MSBn (X): The most significant (sign) bit of X treated as an N bit
 146    value.
 147
 148    SEXTn (X): The infinite sign extension of X treated as an N bit
 149    value.
 150
 151    MAXn, MINn: The upper and lower bound of a signed, two's
 152    complement N bit value.
 153
 154    UMAXn: The upper bound of an unsigned N bit value (the lower
 155    bound is always zero).
 156
 157    Un: UMAXn + 1.  Unsigned arrithmetic is computed `modulo (Un)'.
 158
 159    X[p]: Is bit P of X.  X[0] denotes the least signifant bit.
 160
 161    ~X[p]: Is the inversion of bit X[p]. Also equal to 1-X[p],
 162    (1+X[p])mod(2).
 163
 164
 165
 166    Addition - Overflow - Introduction:
 167
 168
 169    Overflow/Overflow indicates an error in computation of signed
 170    arrithmetic.  i.e. given X,Y in [MINn..MAXn]; overflow
 171    indicates that the result X+Y > MAXn or X+Y < MIN_INTx.
 172
 173    Hardware traditionally implements overflow by computing the XOR of
 174    carry-in/carry-out of the most significant bit of the ALU. Here
 175    other methods need to be found.
 176
 177
 178
 179    Addition - Overflow - method 1:
 180
 181
 182    Overflow occures when the sign (most significant bit) of the two N
 183    bit operands is identical but different to the sign of the result:
 184
 185                 Rn = (Xn + Yn)
 186                 V = MSBn (~(Xn ^ Yn) & (Rn ^ Xn))
 187
 188
 189
 190    Addition - Overflow - method 2:
 191
 192
 193    The two N bit operands are sign extended to M>N bits and then
 194    added.  Overflow occures when SIGN_BIT<n> and SIGN_BIT<m> do not
 195    match.
 196
 197                 Rm = (SEXTn (Xn) + SEXTn (Yn))
 198                 V = MSBn ((Rm >> (M - N)) ^ Rm)
 199
 200
 201
 202    Addition - Overflow - method 3:
 203
 204
 205    The two N bit operands are sign extended to M>N bits and then
 206    added.  Overflow occures when the result is outside of the sign
 207    extended range [MINn .. MAXn].
 208
 209
 210
 211    Addition - Overflow - method 4:
 212
 213
 214    Given the Result and Carry-out bits, the oVerflow from the addition
 215    of X, Y and carry-In can be computed using the equation:
 216
 217                 Rn = (Xn + Yn)
 218                 V = (MSBn ((Xn ^ Yn) ^ Rn)) ^ C)
 219
 220    As shown in the table below:
 221
 222          I  X  Y  R  C | V | X^Y  ^R  ^C
 223         ---------------+---+-------------
 224          0  0  0  0  0 | 0 |  0    0   0
 225          0  0  1  1  0 | 0 |  1    0   0
 226          0  1  0  1  0 | 0 |  1    0   0
 227          0  1  1  0  1 | 1 |  0    0   1
 228          1  0  0  1  0 | 1 |  0    1   1
 229          1  0  1  0  1 | 0 |  1    1   0
 230          1  1  0  0  1 | 0 |  1    1   0
 231          1  1  1  1  1 | 0 |  0    1   0
 232
 233
 234
 235    Addition - Carry - Introduction:
 236
 237
 238    Carry (poorly named) indicates that an overflow occured for
 239    unsigned N bit addition.  i.e. given X, Y in [0..UMAXn] then
 240    carry indicates X+Y > UMAXn or X+Y >= Un.
 241
 242    The following table lists the output for all given inputs into a
 243    full-adder.
 244
 245          I  X  Y  R | C
 246         ------------+---
 247          0  0  0  0 | 0
 248          0  0  1  1 | 0
 249          0  1  0  1 | 0
 250          0  1  1  0 | 1
 251          1  0  0  1 | 0
 252          1  0  1  0 | 1
 253          1  1  0  0 | 1
 254          1  1  1  1 | 1
 255
 256    (carry-In, X, Y, Result, Carry-out):
 257
 258
 259
 260    Addition - Carry - method 1:
 261
 262
 263    Looking at the terms X, Y and R we want an equation for C.
 264
 265        XY\R  0  1
 266           +-------
 267        00 |  0  0
 268        01 |  1  0
 269        11 |  1  1
 270        10 |  1  0
 271
 272    This giving us the sum-of-prod equation:
 273
 274                 MSBn ((Xn & Yn) | (Xn & ~Rn) | (Yn & ~Rn))
 275
 276    Verifying:
 277
 278          I  X  Y  R | C | X&Y  X&~R Y&~R
 279         ------------+---+---------------
 280          0  0  0  0 | 0 |  0    0    0
 281          0  0  1  1 | 0 |  0    0    0
 282          0  1  0  1 | 0 |  0    0    0
 283          0  1  1  0 | 1 |  1    1    1
 284          1  0  0  1 | 0 |  0    0    0
 285          1  0  1  0 | 1 |  0    0    1
 286          1  1  0  0 | 1 |  0    1    0
 287          1  1  1  1 | 1 |  1    0    0
 288
 289
 290
 291    Addition - Carry - method 2:
 292
 293
 294    Given two signed N bit numbers, a carry can be detected by treating
 295    the numbers as N bit unsigned and adding them using M>N unsigned
 296    arrithmetic.  Carry is indicated by bit (1 << N) being set (result
 297    >= 2**N).
 298
 299
 300
 301    Addition - Carry - method 3:
 302
 303
 304    Given the oVerflow bit.  The carry can be computed from:
 305
 306                 (~R&V) | (R&V)
 307
 308
 309
 310    Addition - Carry - method 4:
 311
 312    Given two signed numbers.  Treating them as unsigned we have:
 313
 314                 0 <= X < Un, 0 <= Y < Un
 315         ==>     X + Y < 2 Un
 316
 317    Consider Y when carry occures:
 318
 319                 X + Y >= Un, Y < Un
 320         ==>     (Un - X) <= Y < Un               # re-arange
 321         ==>     Un <= X + Y < Un + X < 2 Un      # add Xn
 322         ==>     0 <= (X + Y) mod Un < X mod Un
 323
 324    or when carry as occured:
 325
 326                (X + Y) mod Un < X mod Un
 327
 328    Consider Y when carry does not occure:
 329
 330                 X + Y < Un
 331         have    X < Un, Y >= 0
 332         ==>     X <= X + Y < Un
 333         ==>     X mod Un <= (X + Y) mod Un
 334
 335    or when carry has not occured:
 336
 337                 ! ( (X + Y) mod Un < X mod Un)
 338
 339
 340
 341    Subtraction - Introduction
 342
 343
 344    There are two different ways of computing the signed two's
 345    complement difference of two numbers.  The first is based on
 346    negative addition, the second on direct subtraction.
 347
 348
 349
 350    Subtraction - Carry - Introduction - Negated Addition
 351
 352
 353    The equation X - Y can be computed using:
 354
 355                 X + (-Y)
 356         ==>     X + ~Y + 1              # -Y = ~Y + 1
 357
 358    In addition to the result, the equation produces Carry-out.  For
 359    succeeding extended prrcision calculations, the more general
 360    equation can be used:
 361
 362                 C[p]:R[p]  =  X[p] + ~Y[p] + C[p-1]
 363         where   C[0]:R[0]  =  X[0] + ~Y[0] + 1
 364
 365
 366
 367    Subtraction - Borrow - Introduction - Direct Subtraction
 368
 369
 370    The alternative to negative addition is direct subtraction where
 371    `X-Y is computed directly.  In addition to the result of the
 372    calculation, a Borrow bit is produced.  In general terms:
 373
 374                 B[p]:R[p]  =  X[p] - Y[p] - B[p-1]
 375         where   B[0]:R[0]  =  X[0] - Y[0]
 376
 377    The Borrow bit is the complement of the Carry bit produced by
 378    Negated Addition above.  A dodgy proof follows:
 379
 380         Case 0:
 381                 C[0]:R[0] = X[0] + ~Y[0] + 1
 382         ==>     C[0]:R[0] = X[0] + 1 - Y[0] + 1 # ~Y[0] = (1 - Y[0])?
 383         ==>     C[0]:R[0] = 2 + X[0] - Y[0]
 384         ==>     C[0]:R[0] = 2 + B[0]:R[0]
 385         ==>     C[0]:R[0] = (1 + B[0]):R[0]
 386         ==>     C[0] = ~B[0]                    # (1 + B[0]) mod 2 = ~B[0]?
 387
 388         Case P:
 389                 C[p]:R[p] = X[p] + ~Y[p] + C[p-1]
 390         ==>     C[p]:R[p] = X[p] + 1 - Y[0] + 1 - B[p-1]
 391         ==>     C[p]:R[p] = 2 + X[p] - Y[0] - B[p-1]
 392         ==>     C[p]:R[p] = 2 + B[p]:R[p]
 393         ==>     C[p]:R[p] = (1 + B[p]):R[p]
 394         ==>     C[p] = ~B[p]
 395
 396    The table below lists all possible inputs/outputs for a
 397    full-subtractor:
 398
 399         X  Y  I  |  R  B
 400         0  0  0  |  0  0
 401         0  0  1  |  1  1
 402         0  1  0  |  1  1
 403         0  1  1  |  0  1
 404         1  0  0  |  1  0
 405         1  0  1  |  0  0
 406         1  1  0  |  0  0
 407         1  1  1  |  1  1
 408
 409
 410
 411    Subtraction - Method 1
 412
 413
 414    Treating Xn and Yn as unsigned values then a borrow (unsigned
 415    underflow) occures when:
 416
 417                 B = Xn < Yn
 418         ==>     C = Xn >= Yn
 419
 420  */
 421
 422
 423
 424 /* 8 bit target expressions:
 425
 426    Since the host's natural bitsize > 8 bits, carry method 2 and
 427    overflow method 2 are used. */
 428
 429 #define ALU8_BEGIN(VAL) \
 430 unsigned alu8_cr = (unsigned8) (VAL); \
 431 signed alu8_vr = (signed8) (alu8_cr)
 432
 433 #define ALU8_SET(VAL) \
 434 alu8_cr = (unsigned8) (VAL); \
 435 alu8_vr = (signed8) (alu8_cr)
 436
 437 #define ALU8_SET_CARRY_BORROW(CARRY)                                    \
 438 do {                                                                    \
 439   if (CARRY)                                                            \
 440     alu8_cr |= ((signed)-1) << 8;                                       \
 441   else                                                                  \
 442     alu8_cr &= 0xff;                                                    \
 443 } while (0)
 444
 445 #define ALU8_HAD_CARRY_BORROW (alu8_cr & LSBIT32(8))
 446 #define ALU8_HAD_OVERFLOW (((alu8_vr >> 8) ^ alu8_vr) & LSBIT32 (8-1))
 447
 448 #define ALU8_RESULT ((unsigned8) alu8_cr)
 449 #define ALU8_CARRY_BORROW_RESULT ((unsigned8) alu8_cr)
 450 #define ALU8_OVERFLOW_RESULT ((unsigned8) alu8_vr)
 451
 452 /* #define ALU8_END ????? - target dependant */
 453
 454
 455
 456 /* 16 bit target expressions:
 457
 458    Since the host's natural bitsize > 16 bits, carry method 2 and
 459    overflow method 2 are used. */
 460
 461 #define ALU16_BEGIN(VAL) \
 462 signed alu16_cr = (unsigned16) (VAL); \
 463 unsigned alu16_vr = (signed16) (alu16_cr)
 464
 465 #define ALU16_SET(VAL) \
 466 alu16_cr = (unsigned16) (VAL); \
 467 alu16_vr = (signed16) (alu16_cr)
 468
 469 #define ALU16_SET_CARRY_BORROW(CARRY)                                   \
 470 do {                                                                    \
 471   if (CARRY)                                                            \
 472     alu16_cr |= ((signed)-1) << 16;                                     \
 473   else                                                                  \
 474     alu16_cr &= 0xffff;                                                 \
 475 } while (0)
 476
 477 #define ALU16_HAD_CARRY_BORROW (alu16_cr & LSBIT32(16))
 478 #define ALU16_HAD_OVERFLOW (((alu16_vr >> 16) ^ alu16_vr) & LSBIT32 (16-1))
 479
 480 #define ALU16_RESULT ((unsigned16) alu16_cr)
 481 #define ALU16_CARRY_BORROW_RESULT ((unsigned16) alu16_cr)
 482 #define ALU16_OVERFLOW_RESULT ((unsigned16) alu16_vr)
 483
 484 /* #define ALU16_END ????? - target dependant */
 485
 486
 487
 488 /* 32 bit target expressions:
 489
 490    Since most hosts do not support 64 (> 32) bit arrithmetic, carry
 491    method 4 and overflow method 4 are used. */
 492
 493 #define ALU32_BEGIN(VAL) \
 494 unsigned32 alu32_r = (VAL); \
 495 int alu32_c = 0; \
 496 int alu32_v = 0
 497
 498 #define ALU32_SET(VAL) \
 499 alu32_r = (VAL); \
 500 alu32_c = 0; \
 501 alu32_v = 0
 502
 503 #define ALU32_SET_CARRY_BORROW(CARRY) alu32_c = (CARRY)
 504
 505 #define ALU32_HAD_CARRY_BORROW (alu32_c)
 506 #define ALU32_HAD_OVERFLOW (alu32_v)
 507
 508 #define ALU32_RESULT (alu32_r)
 509 #define ALU32_CARRY_BORROW_RESULT (alu32_r)
 510 #define ALU32_OVERFLOW_RESULT (alu32_r)
 511
 512
 513
 514 /* 64 bit target expressions:
 515
 516    Even though the host typically doesn't support native 64 bit
 517    arrithmetic, it is still used. */
 518
 519 #define ALU64_BEGIN(VAL) \
 520 natural64 alu64_r = (VAL); \
 521 int alu64_c = 0; \
 522 int alu64_v = 0
 523
 524 #define ALU64_SET(VAL) \
 525 alu64_r = (VAL); \
 526 alu64_c = 0; \
 527 alu64_v = 0
 528
 529 #define ALU64_SET_CARRY_BORROW(CARRY) alu64_c = (CARRY)
 530
 531 #define ALU64_HAD_CARRY_BORROW (alu64_c)
 532 #define ALU64_HAD_OVERFLOW (alu64_v)
 533
 534 #define ALU64_RESULT (alu64_r)
 535 #define ALU64_CARRY_BORROW_RESULT (alu64_r)
 536 #define ALU64_OVERFLOW_RESULT (alu64_r)
 537
 538
 539
 540 /* Generic versions of above macros */
 541
 542 #define ALU_BEGIN           XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_BEGIN)
 543 #define ALU_SET             XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_SET)
 544 #define ALU_SET_CARRY       XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_SET_CARRY)
 545
 546 #define ALU_HAD_OVERFLOW    XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_HAD_OVERFLOW)
 547 #define ALU_HAD_CARRY       XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_HAD_CARRY)
 548
 549 #define ALU_RESULT          XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_RESULT)
 550 #define ALU_OVERFLOW_RESULT XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_OVERFLOW_RESULT)
 551 #define ALU_CARRY_RESULT    XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_CARRY_RESULT)
 552
 553
 554
 555 /* Basic operation - add (overflowing) */
 556
 557 #define ALU8_ADD(VAL)                                                   \
 558 do {                                                                    \
 559   unsigned8 alu8add_val = (VAL);                                        \
 560   ALU8_ADDC (alu8add_val);                                              \
 561 } while (0)
 562
 563 #define ALU16_ADD(VAL)                                                  \
 564 do {                                                                    \
 565   unsigned16 alu16add_val = (VAL);                                      \
 566   ALU16_ADDC (alu8add_val);                                             \
 567 } while (0)
 568
 569 #define ALU32_ADD(VAL)                                                  \
 570 do {                                                                    \
 571   unsigned32 alu32add_val = (VAL);                                      \
 572   ALU32_ADDC (alu32add_val);                                            \
 573 } while (0)
 574
 575 #define ALU64_ADD(VAL)                                                  \
 576 do {                                                                    \
 577   unsigned64 alu64add_val = (unsigned64) (VAL);                         \
 578   ALU64_ADDC (alu64add_val);                                            \
 579 } while (0)
 580
 581 #define ALU_ADD XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_ADD)
 582
 583
 584
 585 /* Basic operation - add carrying (and overflowing) */
 586
 587 #define ALU8_ADDC(VAL)                                                  \
 588 do {                                                                    \
 589   unsigned8 alu8addc_val = (VAL);                                       \
 590   alu8_cr += (unsigned8)(alu8addc_val);                                 \
 591   alu8_vr += (signed8)(alu8addc_val);                                   \
 592 } while (0)
 593
 594 #define ALU16_ADDC(VAL)                                                 \
 595 do {                                                                    \
 596   unsigned16 alu16addc_val = (VAL);                                     \
 597   alu16_cr += (unsigned16)(alu16addc_val);                              \
 598   alu16_vr += (signed16)(alu16addc_val);                                \
 599 } while (0)
 600
 601 #define ALU32_ADDC(VAL)                                                 \
 602 do {                                                                    \
 603   unsigned32 alu32addc_val = (VAL);                                     \
 604   unsigned32 alu32addc_sign = alu32addc_val ^ alu32_r;                  \
 605   alu32_r += (alu32addc_val);                                           \
 606   alu32_c = (alu32_r < alu32addc_val);                                  \
 607   alu32_v = ((alu32addc_sign ^ - (unsigned32)alu32_c) ^ alu32_r) >> 31; \
 608 } while (0)
 609
 610 #define ALU64_ADDC(VAL)                                                 \
 611 do {                                                                    \
 612   unsigned64 alu64addc_val = (unsigned64) (VAL);                        \
 613   unsigned64 alu64addc_sign = alu64addc_val ^ alu64_r;                  \
 614   alu64_r += (alu64addc_val);                                           \
 615   alu64_c = (alu64_r < alu64addc_val);                                  \
 616   alu64_v = ((alu64addc_sign ^ - (unsigned64)alu64_c) ^ alu64_r) >> 63; \
 617 } while (0)
 618
 619 #define ALU_ADDC XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_ADDC)
 620
 621
 622
 623 /* Compound operation - add carrying (and overflowing) with carry-in */
 624
 625 #define ALU8_ADDC_C(VAL,C)                                              \
 626 do {                                                                    \
 627   unsigned8 alu8addcc_val = (VAL);                                      \
 628   unsigned8 alu8addcc_c = (C);                                          \
 629   alu8_cr += (unsigned)(unsigned8)alu8addcc_val + alu8addcc_c;          \
 630   alu8_vr += (signed)(signed8)(alu8addcc_val) + alu8addcc_c;            \
 631 } while (0)
 632
 633 #define ALU16_ADDC_C(VAL,C)                                             \
 634 do {                                                                    \
 635   unsigned16 alu16addcc_val = (VAL);                                    \
 636   unsigned16 alu16addcc_c = (C);                                        \
 637   alu16_cr += (unsigned)(unsigned16)alu16addcc_val + alu16addcc_c;      \
 638   alu16_vr += (signed)(signed16)(alu16addcc_val) + alu16addcc_c;        \
 639 } while (0)
 640
 641 #define ALU32_ADDC_C(VAL,C)                                             \
 642 do {                                                                    \
 643   unsigned32 alu32addcc_val = (VAL);                                    \
 644   unsigned32 alu32addcc_c = (C);                                        \
 645   unsigned32 alu32addcc_sign = (alu32addcc_val ^ alu32_r);              \
 646   alu32_r += (alu32addcc_val + alu32addcc_c);                           \
 647   alu32_c = ((alu32_r < alu32addcc_val)                                 \
 648              || (alu32addcc_c && alu32_r == alu32addcc_val));           \
 649   alu32_v = ((alu32addcc_sign ^ - (unsigned32)alu32_c) ^ alu32_r) >> 31;\
 650 } while (0)
 651
 652 #define ALU64_ADDC_C(VAL,C)                                             \
 653 do {                                                                    \
 654   unsigned64 alu64addcc_val = (VAL);                                    \
 655   unsigned64 alu64addcc_c = (C);                                        \
 656   unsigned64 alu64addcc_sign = (alu64addcc_val ^ alu64_r);              \
 657   alu64_r += (alu64addcc_val + alu64addcc_c);                           \
 658   alu64_c = ((alu64_r < alu64addcc_val)                                 \
 659              || (alu64addcc_c && alu64_r == alu64addcc_val));           \
 660   alu64_v = ((alu64addcc_sign ^ - (unsigned64)alu64_c) ^ alu64_r) >> 63;\
 661 } while (0)
 662
 663 #define ALU_ADDC_C XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_ADDC_C)
 664
 665
 666
 667 /* Basic operation - subtract (overflowing) */
 668
 669 #define ALU8_SUB(VAL)                                                   \
 670 do {                                                                    \
 671   unsigned8 alu8sub_val = (VAL);                                        \
 672   ALU8_ADDC_C (~alu8sub_val, 1);                                        \
 673 } while (0)
 674
 675 #define ALU16_SUB(VAL)                                                  \
 676 do {                                                                    \
 677   unsigned16 alu16sub_val = (VAL);                                      \
 678   ALU16_ADDC_C (~alu16sub_val, 1);                                      \
 679 } while (0)
 680
 681 #define ALU32_SUB(VAL)                                                  \
 682 do {                                                                    \
 683   unsigned32 alu32sub_val = (VAL);                                      \
 684   ALU32_ADDC_C (~alu32sub_val, 1);                                      \
 685 } while (0)
 686
 687 #define ALU64_SUB(VAL)                                                  \
 688 do {                                                                    \
 689   unsigned64 alu64sub_val = (VAL);                                      \
 690   ALU64_ADDC_C (~alu64sub_val, 1);                                      \
 691 } while (0)
 692
 693 #define ALU_SUB XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_SUB)
 694
 695
 696
 697 /* Basic operation - subtract carrying (and overflowing) */
 698
 699 #define ALU8_SUBC(VAL)                                                  \
 700 do {                                                                    \
 701   unsigned8 alu8subc_val = (VAL);                                       \
 702   ALU8_ADDC_C (~alu8subc_val, 1);                                       \
 703 } while (0)
 704
 705 #define ALU16_SUBC(VAL)                                                 \
 706 do {                                                                    \
 707   unsigned16 alu16subc_val = (VAL);                                     \
 708   ALU16_ADDC_C (~alu16subc_val, 1);                                     \
 709 } while (0)
 710
 711 #define ALU32_SUBC(VAL)                                                 \
 712 do {                                                                    \
 713   unsigned32 alu32subc_val = (VAL);                                     \
 714   ALU32_ADDC_C (~alu32subc_val, 1);                                     \
 715 } while (0)
 716
 717 #define ALU64_SUBC(VAL)                                                 \
 718 do {                                                                    \
 719   unsigned64 alu64subc_val = (VAL);                                     \
 720   ALU64_ADDC_C (~alu64subc_val, 1);                                     \
 721 } while (0)
 722
 723 #define ALU_SUBC XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_SUBC)
 724
 725
 726
 727 /* Compound operation - subtract carrying (and overflowing), extended */
 728
 729 #define ALU8_SUBC_X(VAL,C)                                              \
 730 do {                                                                    \
 731   unsigned8 alu8subcx_val = (VAL);                                      \
 732   unsigned8 alu8subcx_c = (C);                                          \
 733   ALU8_ADDC_C (~alu8subcx_val, alu8subcx_c);                            \
 734 } while (0)
 735
 736 #define ALU16_SUBC_X(VAL,C)                                             \
 737 do {                                                                    \
 738   unsigned16 alu16subcx_val = (VAL);                                    \
 739   unsigned16 alu16subcx_c = (C);                                        \
 740   ALU16_ADDC_C (~alu16subcx_val, alu16subcx_c);                         \
 741 } while (0)
 742
 743 #define ALU32_SUBC_X(VAL,C)                                             \
 744 do {                                                                    \
 745   unsigned32 alu32subcx_val = (VAL);                                    \
 746   unsigned32 alu32subcx_c = (C);                                        \
 747   ALU32_ADDC_C (~alu32subcx_val, alu32subcx_c);                         \
 748 } while (0)
 749
 750 #define ALU64_SUBC_X(VAL,C)                                             \
 751 do {                                                                    \
 752   unsigned64 alu64subcx_val = (VAL);                                    \
 753   unsigned64 alu64subcx_c = (C);                                        \
 754   ALU64_ADDC_C (~alu64subcx_val, alu64subcx_c);                         \
 755 } while (0)
 756
 757 #define ALU_SUBC_X XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_SUBC_X)
 758
 759
 760
 761 /* Basic operation - subtract borrowing (and overflowing) */
 762
 763 #define ALU8_SUBB(VAL)                                                  \
 764 do {                                                                    \
 765   unsigned8 alu8subb_val = (VAL);                                       \
 766   alu8_cr -= (unsigned)(unsigned8)alu8subb_val;                         \
 767   alu8_vr -= (signed)(signed8)alu8subb_val;                             \
 768 } while (0)
 769
 770 #define ALU16_SUBB(VAL)                                                 \
 771 do {                                                                    \
 772   unsigned16 alu16subb_val = (VAL);                                     \
 773   alu16_cr -= (unsigned)(unsigned16)alu16subb_val;                      \
 774   alu16_vr -= (signed)(signed16)alu16subb_val;                          \
 775 } while (0)
 776
 777 #define ALU32_SUBB(VAL)                                                 \
 778 do {                                                                    \
 779   unsigned32 alu32subb_val = (VAL);                                     \
 780   unsigned32 alu32subb_sign = alu32subb_val ^ alu32_r;                  \
 781   alu32_c = (alu32_r < alu32subb_val);                                  \
 782   alu32_r -= (alu32subb_val);                                           \
 783   alu32_v = ((alu32subb_sign ^ - (unsigned32)alu32_c) ^ alu32_r) >> 31; \
 784 } while (0)
 785
 786 #define ALU64_SUBB(VAL)                                                 \
 787 do {                                                                    \
 788   unsigned64 alu64subb_val = (VAL);                                     \
 789   unsigned64 alu64subb_sign = alu64subb_val ^ alu64_r;                  \
 790   alu64_c = (alu64_r < alu64subb_val);                                  \
 791   alu64_r -= (alu64subb_val);                                           \
 792   alu64_v = ((alu64subb_sign ^ - (unsigned64)alu64_c) ^ alu64_r) >> 31; \
 793 } while (0)
 794
 795 #define ALU_SUBB XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_SUBB)
 796
 797
 798
 799 /* Compound operation - subtract borrowing (and overflowing) with borrow-in */
 800
 801 #define ALU8_SUBB_B(VAL,B)                                              \
 802 do {                                                                    \
 803   unsigned8 alu8subbb_val = (VAL);                                      \
 804   unsigned8 alu8subbb_b = (B);                                          \
 805   alu8_cr -= (unsigned)(unsigned8)alu8subbb_val;                        \
 806   alu8_cr -= (unsigned)(unsigned8)alu8subbb_b;                          \
 807   alu8_vr -= (signed)(signed8)alu8subbb_val + alu8subbb_b;              \
 808 } while (0)
 809
 810 #define ALU16_SUBB_B(VAL,B)                                             \
 811 do {                                                                    \
 812   unsigned16 alu16subbb_val = (VAL);                                    \
 813   unsigned16 alu16subbb_b = (B);                                        \
 814   alu16_cr -= (unsigned)(unsigned16)alu16subbb_val;                     \
 815   alu16_cr -= (unsigned)(unsigned16)alu16subbb_b;                       \
 816   alu16_vr -= (signed)(signed16)alu16subbb_val + alu16subbb_b;          \
 817 } while (0)
 818
 819 #define ALU32_SUBB_B(VAL,B)                                             \
 820 do {                                                                    \
 821   unsigned32 alu32subbb_val = (VAL);                                    \
 822   unsigned32 alu32subbb_b = (B);                                        \
 823   ALU32_ADDC_C (~alu32subbb_val, !alu32subbb_b);                        \
 824   alu32_c = !alu32_c;                                                   \
 825 } while (0)
 826
 827 #define ALU64_SUBB_B(VAL,B)                                             \
 828 do {                                                                    \
 829   unsigned64 alu64subbb_val = (VAL);                                    \
 830   unsigned64 alu64subbb_b = (B);                                        \
 831   ALU64_ADDC_C (~alu64subbb_val, !alu64subbb_b);                        \
 832   alu64_c = !alu64_c;                                                   \
 833 } while (0)
 834
 835 #define ALU_SUBB_B XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_SUBB_B)
 836
 837
 838
 839 /* Basic operation - negate (overflowing) */
 840
 841 #define ALU8_NEG()                                                      \
 842 do {                                                                    \
 843   signed alu8neg_val = (ALU8_RESULT);                                   \
 844   ALU8_SET (1);                                                         \
 845   ALU8_ADDC (~alu8neg_val);                                             \
 846 } while (0)
 847
 848 #define ALU16_NEG()                                                     \
 849 do {                                                                    \
 850   signed alu16neg_val = (ALU16_RESULT);                         \
 851   ALU16_SET (1);                                                        \
 852   ALU16_ADDC (~alu16neg_val);                                           \
 853 } while (0)
 854
 855 #define ALU32_NEG()                                                     \
 856 do {                                                                    \
 857   unsigned32 alu32neg_val = (ALU32_RESULT);                             \
 858   ALU32_SET (1);                                                        \
 859   ALU32_ADDC (~alu32neg_val);                                           \
 860 } while(0)
 861
 862 #define ALU64_NEG()                                                     \
 863 do {                                                                    \
 864   unsigned64 alu64neg_val = (ALU64_RESULT);                             \
 865   ALU64_SET (1);                                                        \
 866   ALU64_ADDC (~alu64neg_val);                                           \
 867 } while (0)
 868
 869 #define ALU_NEG XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_NEG)
 870
 871
 872
 873
 874 /* Basic operation - negate carrying (and overflowing) */
 875
 876 #define ALU8_NEGC()                                                     \
 877 do {                                                                    \
 878   signed alu8negc_val = (ALU8_RESULT);                                  \
 879   ALU8_SET (1);                                                         \
 880   ALU8_ADDC (~alu8negc_val);                                            \
 881 } while (0)
 882
 883 #define ALU16_NEGC()                                                    \
 884 do {                                                                    \
 885   signed alu16negc_val = (ALU16_RESULT);                                \
 886   ALU16_SET (1);                                                        \
 887   ALU16_ADDC (~alu16negc_val);                                          \
 888 } while (0)
 889
 890 #define ALU32_NEGC()                                                    \
 891 do {                                                                    \
 892   unsigned32 alu32negc_val = (ALU32_RESULT);                            \
 893   ALU32_SET (1);                                                        \
 894   ALU32_ADDC (~alu32negc_val);                                          \
 895 } while(0)
 896
 897 #define ALU64_NEGC()                                                    \
 898 do {                                                                    \
 899   unsigned64 alu64negc_val = (ALU64_RESULT);                            \
 900   ALU64_SET (1);                                                        \
 901   ALU64_ADDC (~alu64negc_val);                                          \
 902 } while (0)
 903
 904 #define ALU_NEGC XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_NEGC)
 905
 906
 907
 908
 909 /* Basic operation - negate borrowing (and overflowing) */
 910
 911 #define ALU8_NEGB()                                                     \
 912 do {                                                                    \
 913   signed alu8negb_val = (ALU8_RESULT);                                  \
 914   ALU8_SET (0);                                                         \
 915   ALU8_SUBB (alu8negb_val);                                             \
 916 } while (0)
 917
 918 #define ALU16_NEGB()                                                    \
 919 do {                                                                    \
 920   signed alu16negb_val = (ALU16_RESULT);                                \
 921   ALU16_SET (0);                                                        \
 922   ALU16_SUBB (alu16negb_val);                                           \
 923 } while (0)
 924
 925 #define ALU32_NEGB()                                                    \
 926 do {                                                                    \
 927   unsigned32 alu32negb_val = (ALU32_RESULT);                            \
 928   ALU32_SET (0);                                                        \
 929   ALU32_SUBB (alu32negb_val);                                           \
 930 } while(0)
 931
 932 #define ALU64_NEGB()                                                    \
 933 do {                                                                    \
 934   unsigned64 alu64negb_val = (ALU64_RESULT);                            \
 935   ALU64_SET (0);                                                        \
 936   ALU64_SUBB (alu64negb_val);                                           \
 937 } while (0)
 938
 939 #define ALU_NEGB XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_NEGB)
 940
 941
 942
 943
 944 /* Other */
 945
 946 #define ALU8_OR(VAL)                                                    \
 947 do {                                                                    \
 948   error("ALU16_OR");                                                    \
 949 } while (0)
 950
 951 #define ALU16_OR(VAL)                                                   \
 952 do {                                                                    \
 953   error("ALU16_OR");                                                    \
 954 } while (0)
 955
 956 #define ALU32_OR(VAL)                                                   \
 957 do {                                                                    \
 958   alu32_r |= (VAL);                                                     \
 959   alu32_c = 0;                                                          \
 960   alu32_v = 0;                                                          \
 961 } while (0)
 962
 963 #define ALU64_OR(VAL)                                                   \
 964 do {                                                                    \
 965   alu64_r |= (VAL);                                                     \
 966   alu64_c = 0;                                                          \
 967   alu64_v = 0;                                                          \
 968 } while (0)
 969
 970 #define ALU_OR(VAL) XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_OR)(VAL)
 971
 972
 973
 974 #define ALU16_XOR(VAL)                                                  \
 975 do {                                                                    \
 976   error("ALU16_XOR");                                                   \
 977 } while (0)
 978
 979 #define ALU32_XOR(VAL)                                                  \
 980 do {                                                                    \
 981   alu32_r ^= (VAL);                                                     \
 982   alu32_c = 0;                                                          \
 983   alu32_v = 0;                                                          \
 984 } while (0)
 985
 986 #define ALU64_XOR(VAL)                                                  \
 987 do {                                                                    \
 988   alu64_r ^= (VAL);                                                     \
 989   alu64_c = 0;                                                          \
 990   alu64_v = 0;                                                          \
 991 } while (0)
 992
 993 #define ALU_XOR(VAL) XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_XOR)(VAL)
 994
 995
 996
 997
 998 #define ALU16_AND(VAL)                                                  \
 999 do {                                                                    \
1000   error("ALU_AND16");                                                   \
1001 } while (0)
1002
1003 #define ALU32_AND(VAL)                                                  \
1004 do {                                                                    \
1005   alu32_r &= (VAL);                                                     \
1006   alu32_r = 0;                                                          \
1007   alu32_v = 0;                                                          \
1008 } while (0)
1009
1010 #define ALU64_AND(VAL)                                                  \
1011 do {                                                                    \
1012   alu64_r &= (VAL);                                                     \
1013   alu64_r = 0;                                                          \
1014   alu64_v = 0;                                                          \
1015 } while (0)
1016
1017 #define ALU_AND(VAL) XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_AND)(VAL)
1018
1019
1020
1021
1022 #define ALU16_NOT(VAL)                                                  \
1023 do {                                                                    \
1024   error("ALU_NOT16");                                                   \
1025 } while (0)
1026
1027 #define ALU32_NOT                                                       \
1028 do {                                                                    \
1029   alu32_r = ~alu32_r;                                                   \
1030   alu32_c = 0;                                                          \
1031   alu32_v = 0;                                                          \
1032 } while (0)
1033
1034 #define ALU64_NOT                                                       \
1035 do {                                                                    \
1036   alu64_r = ~alu64_r;                                                   \
1037   alu64_c = 0;                                                          \
1038   alu64_v = 0;                                                          \
1039 } while (0)
1040
1041 #define ALU_NOT XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_NOT)
1042
1043 #endif