Annotation of gforth/engine/threaded.h, revision 1.28

1.1       anton       1: /* This file defines a number of threading schemes.
                      2: 
1.27      anton       3:   Copyright (C) 1995, 1996,1997,1999,2003,2004 Free Software Foundation, Inc.
1.1       anton       4: 
                      5:   This file is part of Gforth.
                      6: 
                      7:   Gforth is free software; you can redistribute it and/or
                      8:   modify it under the terms of the GNU General Public License
                      9:   as published by the Free Software Foundation; either version 2
                     10:   of the License, or (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
1.7       anton      19:   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.1       anton      20: 
                     21: 
                     22:   This files defines macros for threading. Many sets of macros are
                     23:   defined. Functionally they have only one difference: Some implement
                     24:   direct threading, some indirect threading. The other differences are
                     25:   just variations to help GCC generate faster code for various
                     26:   machines.
                     27: 
                     28:   (Well, to tell the truth, there actually is another functional
                     29:   difference in some pathological cases: e.g., a '!' stores into the
                     30:   cell where the next executed word comes from; or, the next word
                     31:   executed comes from the top-of-stack. These differences are one of
                     32:   the reasons why GCC cannot produce the right variation by itself. We
                     33:   chose disallowing such practices and using the added implementation
                     34:   freedom to achieve a significant speedup, because these practices
                     35:   are not common in Forth (I have never heard of or seen anyone using
                     36:   them), and it is easy to circumvent problems: A control flow change
                     37:   will flush any prefetched words; you may want to do a "0
                     38:   drop" before that to write back the top-of-stack cache.)
                     39: 
                     40:   These macro sets are used in the following ways: After translation
                     41:   to C a typical primitive looks like
                     42: 
                     43:   ...
                     44:   {
                     45:   DEF_CA
                     46:   other declarations
                     47:   NEXT_P0;
                     48:   main part of the primitive
                     49:   NEXT_P1;
                     50:   store results to stack
                     51:   NEXT_P2;
                     52:   }
                     53: 
                     54:   DEF_CA and all the NEXT_P* together must implement NEXT; In the main
                     55:   part the instruction pointer can be read with IP, changed with
                     56:   INC_IP(const_inc), and the cell right behind the presently executing
                     57:   word (i.e. the value of *IP) is accessed with NEXT_INST.
                     58: 
                     59:   If a primitive does not fall through the main part, it has to do the
                     60:   rest by itself. If it changes ip, it has to redo NEXT_P0 (perhaps we
                     61:   should define a macro SET_IP).
                     62: 
                     63:   Some primitives (execute, dodefer) do not end with NEXT, but with
                     64:   EXEC(.). If NEXT_P0 has been called earlier, it has to perform
                     65:   "ip=IP;" to ensure that ip has the right value (NEXT_P0 may change
                     66:   it).
                     67: 
                     68:   Finally, there is NEXT1_P1 and NEXT1_P2, which are parts of EXEC
                     69:   (EXEC(XT) could be defined as "cfa=XT; NEXT1_P1; NEXT1_P2;" (is this
                     70:   true?)) and are used for making docol faster.
                     71: 
                     72:   We can define the ways in which these macros are used with a regular
                     73:   expression:
                     74: 
                     75:   For a primitive
                     76: 
                     77:   DEF_CA NEXT_P0 ( IP | INC_IP | NEXT_INST | ip=...; NEXT_P0 ) * ( NEXT_P1 NEXT_P2 | EXEC(...) )
                     78: 
                     79:   For a run-time routine, e.g., docol:
                     80:   PFA1(cfa) ( NEXT_P0 NEXT | cfa=...; NEXT1_P1; NEXT1_P2 | EXEC(...) )
                     81: 
                     82:   This comment does not yet describe all the dependences that the
                     83:   macros have to satisfy.
                     84: 
                     85:   To organize the former ifdef chaos, each path is separated
                     86:   This gives a quite impressive number of paths, but you clearly
                     87:   find things that go together.
                     88: 
                     89:   It should be possible to organize the whole thing in a way that
                     90:   contains less redundancy and allows a simpler description.
                     91: 
                     92: */
                     93: 
1.28    ! anton      94: #define GOTO(target) do {(real_ca=(target));} while(0)
        !            95: #define DO_GOTO goto before_goto
        !            96: #define NEXT_P2 do {NEXT_P1_5; DO_GOTO;} while(0)
        !            97: #define EXEC(XT) do { EXEC1(XT); DO_GOTO;} while (0)
        !            98: #define NEXT do {DEF_CA NEXT_P1; NEXT_P2;} while(0)
        !            99: #define IPTOS NEXT_INST
        !           100: 
        !           101: 
1.1       anton     102: #ifdef DOUBLY_INDIRECT
1.19      pazsan    103: # ifndef DEBUG_DITC
                    104: #  define DEBUG_DITC 0
                    105: # endif
                    106: /* define to 1 if you want to check consistency */
1.26      pazsan    107: #  define NEXT_P0      do {cfa1=cfa; cfa=*ip;} while(0)
1.23      anton     108: #  define CFA          cfa1
                    109: #  define MORE_VARS     Xt cfa1;
1.1       anton     110: #  define IP           (ip)
1.26      pazsan    111: #  define SET_IP(p)    do {ip=(p); cfa=*ip;} while(0)
1.1       anton     112: #  define NEXT_INST    (cfa)
1.26      pazsan    113: #  define INC_IP(const_inc)    do {cfa=IP[const_inc]; ip+=(const_inc);} while(0)
1.1       anton     114: #  define DEF_CA       Label ca;
1.26      pazsan    115: #  define NEXT_P1      do {\
1.19      pazsan    116:   if (DEBUG_DITC && (cfa<=vm_prims+DOESJUMP || cfa>=vm_prims+npriminfos)) \
                    117:     fprintf(stderr,"NEXT encountered prim %p at ip=%p\n", cfa, ip); \
1.26      pazsan    118:   ip++;} while(0)
1.28    ! anton     119: #  define NEXT_P1_5    do {ca=**cfa; GOTO(ca);} while(0)
        !           120: #  define EXEC1(XT)    do {DEF_CA cfa=(XT);\
1.19      pazsan    121:   if (DEBUG_DITC && (cfa>vm_prims+DOESJUMP && cfa<vm_prims+npriminfos)) \
1.14      anton     122:     fprintf(stderr,"EXEC encountered xt %p at ip=%p, vm_prims=%p, xts=%p\n", cfa, ip, vm_prims, xts); \
1.28    ! anton     123:  ca=**cfa; GOTO(ca);} while(0)
1.1       anton     124: 
1.16      anton     125: #elif defined(NO_IP)
                    126: 
                    127: #define NEXT_P0
1.25      anton     128: #  define CFA          cfa
1.16      anton     129: #define SET_IP(target) assert(0)
                    130: #define INC_IP(n)      ((void)0)
                    131: #define DEF_CA
                    132: #define NEXT_P1
1.28    ! anton     133: #define NEXT_P1_5              do {goto *next_code;} while(0)
1.16      anton     134: /* set next_code to the return address before performing EXEC */
1.28    ! anton     135: #define EXEC1(XT)      do {cfa=(XT); goto **cfa;} while(0)
1.16      anton     136: 
                    137: #else  /* !defined(DOUBLY_INDIRECT) && !defined(NO_IP) */
1.1       anton     138: 
1.3       anton     139: #if defined(DIRECT_THREADED)
                    140: 
1.17      anton     141: /* This lets the compiler know that cfa is dead before; we place it at
                    142:    "goto *"s that perform direct threaded dispatch (i.e., not EXECUTE
                    143:    etc.), and thus do not reach doers, which would use cfa; the only
                    144:    way to a doer is through EXECUTE etc., which set the cfa
                    145:    themselves.
                    146: 
                    147:    Some of these direct threaded schemes use "cfa" to hold the code
                    148:    address in normal direct threaded code.  Of course we cannot use
                    149:    KILLS there.
                    150: 
                    151:    KILLS works by having an empty asm instruction, and claiming to the
                    152:    compiler that it writes to cfa.
                    153: 
                    154:    KILLS is optional.  You can write
                    155: 
                    156: #define KILLS
                    157: 
                    158:    and lose just a little performance.
                    159: */
                    160: #define KILLS asm("":"=X"(cfa));
                    161: 
1.20      anton     162: #ifndef THREADING_SCHEME
1.24      anton     163: #define THREADING_SCHEME 7
1.20      anton     164: #endif
                    165: 
1.3       anton     166: #if THREADING_SCHEME==1
                    167: #warning direct threading scheme 1: autoinc, long latency, cfa live
1.26      pazsan    168: #  define NEXT_P0      do {cfa1=cfa; cfa=*ip++;} while(0)
1.23      anton     169: #  define CFA          cfa1
                    170: #  define MORE_VARS     Xt cfa1;
1.1       anton     171: #  define IP           (ip-1)
1.26      pazsan    172: #  define SET_IP(p)    do {ip=(p); cfa=*ip++;} while(0)
1.1       anton     173: #  define NEXT_INST    (cfa)
1.26      pazsan    174: #  define INC_IP(const_inc)    do {cfa=IP[const_inc]; ip+=(const_inc);} while(0)
1.1       anton     175: #  define DEF_CA
                    176: #  define NEXT_P1
1.28    ! anton     177: #  define NEXT_P1_5    do {GOTO(cfa);} while(0)
        !           178: #  define EXEC1(XT)    do {cfa=(XT); GOTO(*cfa);} while(0)
1.1       anton     179: #endif
                    180: 
1.3       anton     181: #if THREADING_SCHEME==2
                    182: #warning direct threading scheme 2: autoinc, long latency, cfa dead
1.1       anton     183: #  define NEXT_P0      (ip++)
1.23      anton     184: #  define CFA          cfa
1.1       anton     185: #  define IP           (ip-1)
1.26      pazsan    186: #  define SET_IP(p)    do {ip=(p); NEXT_P0;} while(0)
1.1       anton     187: #  define NEXT_INST    (*(ip-1))
1.26      pazsan    188: #  define INC_IP(const_inc)    do { ip+=(const_inc);} while(0)
1.1       anton     189: #  define DEF_CA
                    190: #  define NEXT_P1
1.28    ! anton     191: #  define NEXT_P1_5    do {KILLS GOTO(*(ip-1));} while(0)
        !           192: #  define EXEC1(XT)    do {cfa=(XT); GOTO(*cfa);} while(0)
1.1       anton     193: #endif
                    194: 
                    195: 
1.3       anton     196: #if THREADING_SCHEME==3
                    197: #warning direct threading scheme 3: autoinc, low latency, cfa live
1.1       anton     198: #  define NEXT_P0
1.23      anton     199: #  define CFA          cfa
1.1       anton     200: #  define IP           (ip)
1.26      pazsan    201: #  define SET_IP(p)    do {ip=(p); NEXT_P0;} while(0)
1.1       anton     202: #  define NEXT_INST    (*ip)
1.26      pazsan    203: #  define INC_IP(const_inc)    do {ip+=(const_inc);} while(0)
1.1       anton     204: #  define DEF_CA
1.26      pazsan    205: #  define NEXT_P1      do {cfa=*ip++;} while(0)
1.28    ! anton     206: #  define NEXT_P1_5    do {GOTO(cfa);} while(0)
        !           207: #  define EXEC1(XT)    do {cfa=(XT); GOTO(*cfa);} while(0)
1.1       anton     208: #endif
                    209: 
1.3       anton     210: #if THREADING_SCHEME==4
                    211: #warning direct threading scheme 4: autoinc, low latency, cfa dead
1.1       anton     212: #  define NEXT_P0
1.23      anton     213: #  define CFA          cfa
1.1       anton     214: #  define IP           (ip)
1.26      pazsan    215: #  define SET_IP(p)    do {ip=(p); NEXT_P0;} while(0)
1.1       anton     216: #  define NEXT_INST    (*ip)
1.26      pazsan    217: #  define INC_IP(const_inc)    do { ip+=(const_inc);} while(0)
1.1       anton     218: #  define DEF_CA
                    219: #  define NEXT_P1
1.28    ! anton     220: #  define NEXT_P1_5    do {KILLS GOTO(*(ip++));} while(0)
        !           221: #  define EXEC1(XT)    do {cfa=(XT); GOTO(*cfa);} while(0)
1.1       anton     222: #endif
                    223: 
1.3       anton     224: #if THREADING_SCHEME==5
                    225: #warning direct threading scheme 5: long latency, cfa live
1.26      pazsan    226: #  define NEXT_P0      do {cfa1=cfa; cfa=*ip;} while(0)
1.23      anton     227: #  define CFA          cfa1
                    228: #  define MORE_VARS     Xt cfa1;
1.1       anton     229: #  define IP           (ip)
1.26      pazsan    230: #  define SET_IP(p)    do {ip=(p); cfa=*ip;} while(0)
1.1       anton     231: #  define NEXT_INST    (cfa)
1.26      pazsan    232: #  define INC_IP(const_inc)    do {cfa=IP[const_inc]; ip+=(const_inc);} while(0)
1.1       anton     233: #  define DEF_CA
                    234: #  define NEXT_P1      (ip++)
1.28    ! anton     235: #  define NEXT_P1_5    do {GOTO(cfa);} while(0)
        !           236: #  define EXEC1(XT)    do {cfa=(XT); GOTO(*cfa);} while(0)
1.1       anton     237: #endif
                    238: 
1.3       anton     239: #if THREADING_SCHEME==6
                    240: #warning direct threading scheme 6: long latency, cfa dead
1.1       anton     241: #  define NEXT_P0
1.23      anton     242: #  define CFA          cfa
1.1       anton     243: #  define IP           (ip)
1.26      pazsan    244: #  define SET_IP(p)    do {ip=(p); NEXT_P0;} while(0)
1.1       anton     245: #  define NEXT_INST    (*ip)
1.26      pazsan    246: #  define INC_IP(const_inc)    do {ip+=(const_inc);} while(0)
1.1       anton     247: #  define DEF_CA
                    248: #  define NEXT_P1      (ip++)
1.28    ! anton     249: #  define NEXT_P1_5    do {KILLS GOTO(*(ip-1));} while(0)
        !           250: #  define EXEC1(XT)    do {cfa=(XT); GOTO(*cfa);} while(0)
1.1       anton     251: #endif
                    252: 
                    253: 
1.3       anton     254: #if THREADING_SCHEME==7
                    255: #warning direct threading scheme 7: low latency, cfa live
1.1       anton     256: #  define NEXT_P0
1.23      anton     257: #  define CFA          cfa
1.1       anton     258: #  define IP           (ip)
1.26      pazsan    259: #  define SET_IP(p)    do {ip=(p); NEXT_P0;} while(0)
1.1       anton     260: #  define NEXT_INST    (*ip)
1.26      pazsan    261: #  define INC_IP(const_inc)    do {ip+=(const_inc);} while(0)
1.1       anton     262: #  define DEF_CA
1.26      pazsan    263: #  define NEXT_P1      do {cfa=*ip++;} while(0)
1.28    ! anton     264: #  define NEXT_P1_5    do {GOTO(cfa);} while(0)
        !           265: #  define EXEC1(XT)    do {cfa=(XT); GOTO(*cfa);} while(0)
1.1       anton     266: #endif
                    267: 
1.3       anton     268: #if THREADING_SCHEME==8
                    269: #warning direct threading scheme 8: cfa dead, i386 hack
1.1       anton     270: #  define NEXT_P0
1.23      anton     271: #  define CFA          cfa
1.1       anton     272: #  define IP           (ip)
1.26      pazsan    273: #  define SET_IP(p)    do {ip=(p); NEXT_P0;} while(0)
1.1       anton     274: #  define NEXT_INST    (*IP)
1.26      pazsan    275: #  define INC_IP(const_inc)    do { ip+=(const_inc);} while(0)
1.1       anton     276: #  define DEF_CA
                    277: #  define NEXT_P1      (ip++)
1.28    ! anton     278: #  define NEXT_P1_5    do {KILLS GOTO(*(ip-1));} while(0)
        !           279: #  define EXEC1(XT)    do {cfa=(XT); GOTO(*cfa);} while(0)
1.1       anton     280: #endif
                    281: 
1.3       anton     282: #if THREADING_SCHEME==9
                    283: #warning direct threading scheme 9: Power/PPC hack, long latency
                    284: /* Power uses a prepare-to-branch instruction, and the latency between
                    285:    this inst and the branch is 5 cycles on a PPC604; so we utilize this
                    286:    to do some prefetching in between */
                    287: #  define NEXT_P0
1.23      anton     288: #  define CFA          cfa
1.3       anton     289: #  define IP           ip
1.26      pazsan    290: #  define SET_IP(p)    do {ip=(p); next_cfa=*ip; NEXT_P0;} while(0)
1.3       anton     291: #  define NEXT_INST    (next_cfa)
1.26      pazsan    292: #  define INC_IP(const_inc)    do {next_cfa=IP[const_inc]; ip+=(const_inc);} while(0)
1.8       anton     293: #  define DEF_CA       
1.26      pazsan    294: #  define NEXT_P1      do {cfa=next_cfa; ip++; next_cfa=*ip;} while(0)
1.28    ! anton     295: #  define NEXT_P1_5    do {GOTO(cfa);} while(0)
        !           296: #  define EXEC1(XT)    do {cfa=(XT); GOTO(*cfa);} while(0)
1.3       anton     297: #  define MORE_VARS    Xt next_cfa;
                    298: #endif
1.1       anton     299: 
1.3       anton     300: #if THREADING_SCHEME==10
                    301: #warning direct threading scheme 10: plain (no attempt at scheduling)
                    302: #  define NEXT_P0
1.23      anton     303: #  define CFA          cfa
1.3       anton     304: #  define IP           (ip)
1.26      pazsan    305: #  define SET_IP(p)    do {ip=(p); NEXT_P0;} while(0)
1.3       anton     306: #  define NEXT_INST    (*ip)
1.26      pazsan    307: #  define INC_IP(const_inc)    do {ip+=(const_inc);} while(0)
1.3       anton     308: #  define DEF_CA
                    309: #  define NEXT_P1
1.28    ! anton     310: #  define NEXT_P1_5    do {cfa=*ip++; GOTO(cfa);} while(0)
        !           311: #  define EXEC1(XT)    do {cfa=(XT); GOTO(*cfa);} while(0)
1.3       anton     312: #endif
1.1       anton     313: 
1.3       anton     314: /* direct threaded */
                    315: #else
1.1       anton     316: /* indirect THREADED  */
1.20      anton     317: 
                    318: #ifndef THREADING_SCHEME
                    319: #define THREADING_SCHEME 6
                    320: #endif
1.1       anton     321: 
1.3       anton     322: #if THREADING_SCHEME==1
                    323: #warning indirect threading scheme 1: autoinc, long latency, cisc
1.26      pazsan    324: #  define NEXT_P0      do {cfa1=cfa; cfa=*ip++;} while(0)
1.23      anton     325: #  define CFA          cfa1
                    326: #  define MORE_VARS     Xt cfa1;
1.1       anton     327: #  define IP           (ip-1)
1.26      pazsan    328: #  define SET_IP(p)    do {ip=(p); cfa=*ip++;} while(0)
1.1       anton     329: #  define NEXT_INST    (cfa)
1.26      pazsan    330: #  define INC_IP(const_inc)    do {cfa=IP[const_inc]; ip+=(const_inc);} while(0)
1.1       anton     331: #  define DEF_CA
                    332: #  define NEXT_P1
1.28    ! anton     333: #  define NEXT_P1_5    do {GOTO(*cfa);} while(0)
        !           334: #  define EXEC1(XT)    do {cfa=(XT); GOTO(*cfa);} while(0)
1.1       anton     335: #endif
                    336: 
1.3       anton     337: #if THREADING_SCHEME==2
                    338: #warning indirect threading scheme 2: autoinc, long latency
1.26      pazsan    339: #  define NEXT_P0      do {cfa1=cfa; cfa=*ip++;} while(0)
1.23      anton     340: #  define CFA          cfa1
                    341: #  define MORE_VARS     Xt cfa1;
1.1       anton     342: #  define IP           (ip-1)
1.26      pazsan    343: #  define SET_IP(p)    do {ip=(p); cfa=*ip++;} while(0)
1.1       anton     344: #  define NEXT_INST    (cfa)
1.26      pazsan    345: #  define INC_IP(const_inc)    do {cfa=IP[const_inc]; ip+=(const_inc);} while(0)
1.1       anton     346: #  define DEF_CA       Label ca;
1.26      pazsan    347: #  define NEXT_P1      do {ca=*cfa;} while(0)
1.28    ! anton     348: #  define NEXT_P1_5    do {GOTO(ca);} while(0)
        !           349: #  define EXEC1(XT)    do {DEF_CA cfa=(XT); ca=*cfa; GOTO(ca);} while(0)
1.1       anton     350: #endif
                    351: 
                    352: 
1.3       anton     353: #if THREADING_SCHEME==3
                    354: #warning indirect threading scheme 3: autoinc, low latency, cisc
1.1       anton     355: #  define NEXT_P0
1.23      anton     356: #  define CFA          cfa
1.1       anton     357: #  define IP           (ip)
1.26      pazsan    358: #  define SET_IP(p)    do {ip=(p); NEXT_P0;} while(0)
1.1       anton     359: #  define NEXT_INST    (*ip)
1.26      pazsan    360: #  define INC_IP(const_inc)    do {ip+=(const_inc);} while(0)
1.1       anton     361: #  define DEF_CA
                    362: #  define NEXT_P1
1.28    ! anton     363: #  define NEXT_P1_5    do {cfa=*ip++; GOTO(*cfa);} while(0)
        !           364: #  define EXEC1(XT)    do {cfa=(XT); GOTO(*cfa);} while(0)
1.1       anton     365: #endif
                    366: 
1.3       anton     367: #if THREADING_SCHEME==4
                    368: #warning indirect threading scheme 4: autoinc, low latency
1.26      pazsan    369: #  define NEXT_P0      do {cfa1=cfa; cfa=*ip++;} while(0)
1.23      anton     370: #  define CFA          cfa1
                    371: #  define MORE_VARS     Xt cfa1;
1.1       anton     372: #  define IP           (ip-1)
1.26      pazsan    373: #  define SET_IP(p)    do {ip=(p); cfa=*ip++;} while(0)
1.1       anton     374: #  define NEXT_INST    (cfa)
1.26      pazsan    375: #  define INC_IP(const_inc)    do {cfa=IP[const_inc]; ip+=(const_inc);} while(0)
1.1       anton     376: #  define DEF_CA       Label ca;
1.26      pazsan    377: #  define NEXT_P1      do {ca=*cfa;} while(0)
1.28    ! anton     378: #  define NEXT_P1_5    do {GOTO(ca);} while(0)
        !           379: #  define EXEC1(XT)    do {DEF_CA cfa=(XT); ca=*cfa; GOTO(ca);} while(0)
1.1       anton     380: #endif
                    381: 
                    382: 
1.3       anton     383: #if THREADING_SCHEME==5
                    384: #warning indirect threading scheme 5: long latency, cisc
1.26      pazsan    385: #  define NEXT_P0      do {cfa1=cfa; cfa=*ip;} while(0)
1.23      anton     386: #  define CFA          cfa1
                    387: #  define MORE_VARS     Xt cfa1;
1.1       anton     388: #  define IP           (ip)
1.26      pazsan    389: #  define SET_IP(p)    do {ip=(p); cfa=*ip;} while(0)
1.1       anton     390: #  define NEXT_INST    (cfa)
1.26      pazsan    391: #  define INC_IP(const_inc)    do {cfa=IP[const_inc]; ip+=(const_inc);} while(0)
1.1       anton     392: #  define DEF_CA
                    393: #  define NEXT_P1      (ip++)
1.28    ! anton     394: #  define NEXT_P1_5    do {GOTO(*cfa);} while(0)
        !           395: #  define EXEC1(XT)    do {cfa=(XT); GOTO(*cfa);} while(0)
1.1       anton     396: #endif
                    397: 
1.3       anton     398: #if THREADING_SCHEME==6
                    399: #warning indirect threading scheme 6: long latency
1.26      pazsan    400: #  define NEXT_P0      do {cfa1=cfa; cfa=*ip;} while(0)
1.23      anton     401: #  define CFA          cfa1
                    402: #  define MORE_VARS     Xt cfa1;
1.1       anton     403: #  define IP           (ip)
1.26      pazsan    404: #  define SET_IP(p)    do {ip=(p); cfa=*ip;} while(0)
1.1       anton     405: #  define NEXT_INST    (cfa)
1.26      pazsan    406: #  define INC_IP(const_inc)    do {cfa=IP[const_inc]; ip+=(const_inc);} while(0)
1.1       anton     407: #  define DEF_CA       Label ca;
1.26      pazsan    408: #  define NEXT_P1      do {ip++; ca=*cfa;} while(0)
1.28    ! anton     409: #  define NEXT_P1_5    do {GOTO(ca);} while(0)
        !           410: #  define EXEC1(XT)    do {DEF_CA cfa=(XT); ca=*cfa; GOTO(ca);} while(0)
1.1       anton     411: #endif
                    412: 
1.3       anton     413: #if THREADING_SCHEME==7
                    414: #warning indirect threading scheme 7: low latency
1.26      pazsan    415: #  define NEXT_P0      do {cfa1=cfa; cfa=*ip;} while(0)
1.23      anton     416: #  define CFA          cfa1
                    417: #  define MORE_VARS     Xt cfa1;
1.3       anton     418: #  define IP           (ip)
1.26      pazsan    419: #  define SET_IP(p)    do {ip=(p); cfa=*ip;} while(0)
1.3       anton     420: #  define NEXT_INST    (cfa)
1.26      pazsan    421: #  define INC_IP(const_inc)    do {cfa=IP[const_inc]; ip+=(const_inc);} while(0)
1.3       anton     422: #  define DEF_CA       Label ca;
1.26      pazsan    423: #  define NEXT_P1      do {ip++; ca=*cfa;} while(0)
1.28    ! anton     424: #  define NEXT_P1_5    do {GOTO(ca);} while(0)
        !           425: #  define EXEC1(XT)    do {DEF_CA cfa=(XT); ca=*cfa; GOTO(ca);} while(0)
1.3       anton     426: #endif
1.1       anton     427: 
1.3       anton     428: #if THREADING_SCHEME==8
                    429: #warning indirect threading scheme 8: low latency,cisc
1.1       anton     430: #  define NEXT_P0
1.23      anton     431: #  define CFA          cfa
1.1       anton     432: #  define IP           (ip)
1.26      pazsan    433: #  define SET_IP(p)    do {ip=(p); NEXT_P0;} while(0)
1.1       anton     434: #  define NEXT_INST    (*ip)
1.26      pazsan    435: #  define INC_IP(const_inc)    do {ip+=(const_inc);} while(0)
1.1       anton     436: #  define DEF_CA
                    437: #  define NEXT_P1
1.28    ! anton     438: #  define NEXT_P1_5    do {cfa=*ip++; GOTO(*cfa);} while(0)
        !           439: #  define EXEC1(XT)    do {cfa=(XT); GOTO(*cfa);} while(0)
1.1       anton     440: #endif
                    441: 
1.3       anton     442: /* indirect threaded */
1.1       anton     443: #endif
                    444: 
1.16      anton     445: #endif /* !defined(DOUBLY_INDIRECT) && !defined(NO_IP) */
1.1       anton     446: 

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