Diff for /gforth/engine/threaded.h between versions 1.15 and 1.40

version 1.15, 2002/01/20 19:04:11 version 1.40, 2008/11/01 22:19:31
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 /* This file defines a number of threading schemes.  /* This file defines a number of threading schemes.
   
   Copyright (C) 1995, 1996,1997,1999 Free Software Foundation, Inc.    Copyright (C) 1995, 1996,1997,1999,2003,2004,2005,2007,2008 Free Software Foundation, Inc.
   
   This file is part of Gforth.    This file is part of Gforth.
   
   Gforth is free software; you can redistribute it and/or    Gforth is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License    modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; either version 2    as published by the Free Software Foundation, either version 3
   of the License, or (at your option) any later version.    of the License, or (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,    This program is distributed in the hope that it will be useful,
Line 15 Line 15
   GNU General Public License for more details.    GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License    You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software    along with this program; if not, see http://www.gnu.org/licenses/.
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.  
   
   
   This files defines macros for threading. Many sets of macros are    This files defines macros for threading. Many sets of macros are
Line 91 Line 90
   
 */  */
   
 #ifdef DOUBLY_INDIRECT  #if !defined(GCC_PR15242_WORKAROUND)
 #  define NEXT_P0       ({cfa=*ip;})  #if __GNUC__ == 3
 #  define IP            (ip)  /* various gcc-3.x version have problems (including PR15242) that are
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})     solved with this workaround */
 #  define NEXT_INST     (cfa)  #define GCC_PR15242_WORKAROUND 1
 #  define INC_IP(const_inc)     ({cfa=IP[const_inc]; ip+=(const_inc);})  #else
 #  define DEF_CA        Label ca;  /* other gcc versions are better off without the workaround for
 #  define NEXT_P1       ({\     primitives that are not relocatable */
   if (cfa<=vm_prims+DOESJUMP || cfa>=vm_prims+npriminfos) \  #define GCC_PR15242_WORKAROUND 0
     fprintf(stderr,"NEXT encountered prim %p at ip=%p\n", cfa, ip); \  
   ip++; ca=**cfa;})  
 #  define NEXT_P2       ({goto *ca;})  
 #  define EXEC(XT)      ({DEF_CA cfa=(XT);\  
   if (cfa>vm_prims+DOESJUMP && cfa<vm_prims+npriminfos) \  
     fprintf(stderr,"EXEC encountered xt %p at ip=%p, vm_prims=%p, xts=%p\n", cfa, ip, vm_prims, xts); \  
  ca=**cfa; goto *ca;})  
   
 #else /* !defined(DOUBLY_INDIRECT) */  
   
 #if defined(DIRECT_THREADED)  
   
 #if THREADING_SCHEME==1  
 #warning direct threading scheme 1: autoinc, long latency, cfa live  
 #  define NEXT_P0       ({cfa=*ip++;})  
 #  define IP            (ip-1)  
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  
 #  define NEXT_INST     (cfa)  
 #  define INC_IP(const_inc)     ({cfa=IP[const_inc]; ip+=(const_inc);})  
 #  define DEF_CA  
 #  define NEXT_P1  
 #  define NEXT_P2       ({goto *cfa;})  
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  
 #endif  #endif
   
 #if THREADING_SCHEME==2  
 #warning direct threading scheme 2: autoinc, long latency, cfa dead  
 #  define NEXT_P0       (ip++)  
 #  define IP            (ip-1)  
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  
 #  define NEXT_INST     (*(ip-1))  
 #  define INC_IP(const_inc)     ({ ip+=(const_inc);})  
 #  define DEF_CA  
 #  define NEXT_P1  
 #  define NEXT_P2       ({goto **(ip-1);})  
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  
 #endif  #endif
   
   #if GCC_PR15242_WORKAROUND
 #if THREADING_SCHEME==3  #define DO_GOTO goto before_goto
 #warning direct threading scheme 3: autoinc, low latency, cfa live  #else
 #  define NEXT_P0  #define DO_GOTO goto *real_ca
 #  define IP            (ip)  
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  
 #  define NEXT_INST     (*ip)  
 #  define INC_IP(const_inc)     ({ip+=(const_inc);})  
 #  define DEF_CA  
 #  define NEXT_P1       ({cfa=*ip++;})  
 #  define NEXT_P2       ({goto *cfa;})  
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  
 #endif  #endif
   
 #if THREADING_SCHEME==4  #ifndef GOTO_ALIGN
 #warning direct threading scheme 4: autoinc, low latency, cfa dead  #define GOTO_ALIGN
 #  define NEXT_P0  
 #  define IP            (ip)  
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  
 #  define NEXT_INST     (*ip)  
 #  define INC_IP(const_inc)     ({ ip+=(const_inc);})  
 #  define DEF_CA  
 #  define NEXT_P1  
 #  define NEXT_P2       ({goto **(ip++);})  
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  
 #endif  #endif
   
 #if THREADING_SCHEME==5  #define GOTO(target) do {(real_ca=(target));} while(0)
 #warning direct threading scheme 5: long latency, cfa live  #define NEXT_P2 do {NEXT_P1_5; DO_GOTO;} while(0)
 #  define NEXT_P0       ({cfa=*ip;})  #define EXEC(XT) do { real_ca=EXEC1(XT); DO_GOTO;} while (0)
 #  define IP            (ip)  #define VM_JUMP(target) do {GOTO(target);} while (0)
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  #define NEXT do {DEF_CA NEXT_P1; NEXT_P2;} while(0)
 #  define NEXT_INST     (cfa)  #define FIRST_NEXT_P2 NEXT_P1_5; GOTO_ALIGN; \
 #  define INC_IP(const_inc)     ({cfa=IP[const_inc]; ip+=(const_inc);})  before_goto: goto *real_ca; after_goto:
 #  define DEF_CA  #define FIRST_NEXT do {DEF_CA NEXT_P1; FIRST_NEXT_P2;} while(0)
 #  define NEXT_P1       (ip++)  #define IPTOS NEXT_INST
 #  define NEXT_P2       ({goto *cfa;})  
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  
 #endif  
   
 #if THREADING_SCHEME==6  
 #warning direct threading scheme 6: long latency, cfa dead  
 #  define NEXT_P0  
 #  define IP            (ip)  
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  
 #  define NEXT_INST     (*ip)  
 #  define INC_IP(const_inc)     ({ip+=(const_inc);})  
 #  define DEF_CA  
 #  define NEXT_P1       (ip++)  
 #  define NEXT_P2       ({goto **(ip-1);})  
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  
 #endif  
   
   #ifdef DOUBLY_INDIRECT
   # ifndef DEBUG_DITC
   #  define DEBUG_DITC 0
   # endif
   /* define to 1 if you want to check consistency */
   #  define NEXT_P0       do {cfa1=cfa; cfa=*ip;} while(0)
   #  define CFA           cfa1
   #  define MORE_VARS     Xt cfa1;
   #  define IP            (ip)
   #  define SET_IP(p)     do {ip=(p); cfa=*ip;} while(0)
   #  define NEXT_INST     (cfa)
   #  define INC_IP(const_inc)     do {cfa=IP[const_inc]; ip+=(const_inc);} while(0)
   #  define DEF_CA        Label MAYBE_UNUSED ca;
   #  define NEXT_P1       do {\
     if (DEBUG_DITC && (cfa<=vm_prims+DOESJUMP || cfa>=vm_prims+npriminfos)) \
       fprintf(stderr,"NEXT encountered prim %p at ip=%p\n", cfa, ip); \
     ip++;} while(0)
   #  define NEXT_P1_5     do {ca=**cfa; GOTO(ca);} while(0)
   #  define EXEC1(XT)     ({DEF_CA cfa=(XT);\
     if (DEBUG_DITC && (cfa>vm_prims+DOESJUMP && cfa<vm_prims+npriminfos)) \
       fprintf(stderr,"EXEC encountered xt %p at ip=%p, vm_prims=%p, xts=%p\n", cfa, ip, vm_prims, xts); \
    ca=**cfa; ca;})
   
 #if THREADING_SCHEME==7  #elif defined(NO_IP)
 #warning direct threading scheme 7: low latency, cfa live  
 #  define NEXT_P0  
 #  define IP            (ip)  
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  
 #  define NEXT_INST     (*ip)  
 #  define INC_IP(const_inc)     ({ip+=(const_inc);})  
 #  define DEF_CA  
 #  define NEXT_P1       ({cfa=*ip++;})  
 #  define NEXT_P2       ({goto *cfa;})  
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  
 #endif  
   
 #if THREADING_SCHEME==8  #define NEXT_P0
 #warning direct threading scheme 8: cfa dead, i386 hack  #  define CFA           cfa
 #  define NEXT_P0  #define SET_IP(target)  assert(0)
 #  define IP            (ip)  #define INC_IP(n)       ((void)0)
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  #define DEF_CA
 #  define NEXT_INST     (*IP)  #define NEXT_P1
 #  define INC_IP(const_inc)     ({ ip+=(const_inc);})  #define NEXT_P1_5               do {goto *next_code;} while(0)
 #  define DEF_CA  /* set next_code to the return address before performing EXEC */
 #  define NEXT_P1       (ip++)  /* original: */
 #  define NEXT_P2       ({goto **(ip-1);})  /* #define EXEC1(XT)    do {cfa=(XT); goto **cfa;} while(0) */
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  /* fake, to make syntax check work */
 #endif  #define EXEC1(XT)       ({cfa=(XT); *cfa;})
   
 #if THREADING_SCHEME==9  
 #warning direct threading scheme 9: Power/PPC hack, long latency  
 /* Power uses a prepare-to-branch instruction, and the latency between  
    this inst and the branch is 5 cycles on a PPC604; so we utilize this  
    to do some prefetching in between */  
 #  define NEXT_P0  
 #  define IP            ip  
 #  define SET_IP(p)     ({ip=(p); next_cfa=*ip; NEXT_P0;})  
 #  define NEXT_INST     (next_cfa)  
 #  define INC_IP(const_inc)     ({next_cfa=IP[const_inc]; ip+=(const_inc);})  
 #  define DEF_CA          
 #  define NEXT_P1       ({cfa=next_cfa; ip++; next_cfa=*ip;})  
 #  define NEXT_P2       ({goto *cfa;})  
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  
 #  define MORE_VARS     Xt next_cfa;  
 #endif  
   
 #if THREADING_SCHEME==10  #else  /* !defined(DOUBLY_INDIRECT) && !defined(NO_IP) */
 #warning direct threading scheme 10: plain (no attempt at scheduling)  
 #  define NEXT_P0  
 #  define IP            (ip)  
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  
 #  define NEXT_INST     (*ip)  
 #  define INC_IP(const_inc)     ({ip+=(const_inc);})  
 #  define DEF_CA  
 #  define NEXT_P1  
 #  define NEXT_P2       ({cfa=*ip++; goto *cfa;})  
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  
 #endif  
   
 /* direct threaded */  #if defined(DIRECT_THREADED)
 #else  
 /* indirect THREADED  */  
   
 #if THREADING_SCHEME==1  /* This lets the compiler know that cfa is dead before; we place it at
 #warning indirect threading scheme 1: autoinc, long latency, cisc     "goto *"s that perform direct threaded dispatch (i.e., not EXECUTE
 #  define NEXT_P0       ({cfa=*ip++;})     etc.), and thus do not reach doers, which would use cfa; the only
 #  define IP            (ip-1)     way to a doer is through EXECUTE etc., which set the cfa
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})     themselves.
 #  define NEXT_INST     (cfa)  
 #  define INC_IP(const_inc)     ({cfa=IP[const_inc]; ip+=(const_inc);})  
 #  define DEF_CA  
 #  define NEXT_P1  
 #  define NEXT_P2       ({goto **cfa;})  
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  
 #endif  
   
 #if THREADING_SCHEME==2     Some of these direct threaded schemes use "cfa" to hold the code
 #warning indirect threading scheme 2: autoinc, long latency     address in normal direct threaded code.  Of course we cannot use
 #  define NEXT_P0       ({cfa=*ip++;})     KILLS there.
 #  define IP            (ip-1)  
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  
 #  define NEXT_INST     (cfa)  
 #  define INC_IP(const_inc)     ({cfa=IP[const_inc]; ip+=(const_inc);})  
 #  define DEF_CA        Label ca;  
 #  define NEXT_P1       ({ca=*cfa;})  
 #  define NEXT_P2       ({goto *ca;})  
 #  define EXEC(XT)      ({DEF_CA cfa=(XT); ca=*cfa; goto *ca;})  
 #endif  
   
      KILLS works by having an empty asm instruction, and claiming to the
      compiler that it writes to cfa.
   
 #if THREADING_SCHEME==3     KILLS is optional.  You can write
 #warning indirect threading scheme 3: autoinc, low latency, cisc  
 #  define NEXT_P0  
 #  define IP            (ip)  
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  
 #  define NEXT_INST     (*ip)  
 #  define INC_IP(const_inc)     ({ip+=(const_inc);})  
 #  define DEF_CA  
 #  define NEXT_P1  
 #  define NEXT_P2       ({cfa=*ip++; goto **cfa;})  
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  
 #endif  
   
 #if THREADING_SCHEME==4  #define KILLS
 #warning indirect threading scheme 4: autoinc, low latency  
 #  define NEXT_P0       ({cfa=*ip++;})  
 #  define IP            (ip-1)  
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  
 #  define NEXT_INST     (cfa)  
 #  define INC_IP(const_inc)     ({cfa=IP[const_inc]; ip+=(const_inc);})  
 #  define DEF_CA        Label ca;  
 #  define NEXT_P1       ({ca=*cfa;})  
 #  define NEXT_P2       ({goto *ca;})  
 #  define EXEC(XT)      ({DEF_CA cfa=(XT); ca=*cfa; goto *ca;})  
 #endif  
   
      and lose just a little performance.
   */
   #define KILLS asm("":"=X"(cfa));
   
 #if THREADING_SCHEME==5  /* #warning direct threading scheme 8: cfa dead, i386 hack */
 #warning indirect threading scheme 5: long latency, cisc  #  define NEXT_P0
 #  define NEXT_P0       ({cfa=*ip;})  #  define CFA           cfa
 #  define IP            (ip)  #  define IP            (ip)
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  #  define SET_IP(p)     do {ip=(p); NEXT_P0;} while(0)
 #  define NEXT_INST     (cfa)  #  define NEXT_INST     (*IP)
 #  define INC_IP(const_inc)     ({cfa=IP[const_inc]; ip+=(const_inc);})  #  define INC_IP(const_inc)     do { ip+=(const_inc);} while(0)
 #  define DEF_CA  #  define DEF_CA
 #  define NEXT_P1       (ip++)  #  define NEXT_P1       (ip++)
 #  define NEXT_P2       ({goto **cfa;})  #  define NEXT_P1_5     do {KILLS GOTO(*(ip-1));} while(0)
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  #  define EXEC1(XT)     ({cfa=(XT); *cfa;})
 #endif  
   
 #if THREADING_SCHEME==6  /* direct threaded */
 #warning indirect threading scheme 6: long latency  #else
 #  define NEXT_P0       ({cfa=*ip;})  /* indirect THREADED  */
 #  define IP            (ip)  
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  
 #  define NEXT_INST     (cfa)  
 #  define INC_IP(const_inc)     ({cfa=IP[const_inc]; ip+=(const_inc);})  
 #  define DEF_CA        Label ca;  
 #  define NEXT_P1       ({ip++; ca=*cfa;})  
 #  define NEXT_P2       ({goto *ca;})  
 #  define EXEC(XT)      ({DEF_CA cfa=(XT); ca=*cfa; goto *ca;})  
 #endif  
   
 #if THREADING_SCHEME==7  
 #warning indirect threading scheme 7: low latency  
 #  define NEXT_P0       ({cfa=*ip;})  
 #  define IP            (ip)  
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  
 #  define NEXT_INST     (cfa)  
 #  define INC_IP(const_inc)     ({cfa=IP[const_inc]; ip+=(const_inc);})  
 #  define DEF_CA        Label ca;  
 #  define NEXT_P1       ({ip++; ca=*cfa;})  
 #  define NEXT_P2       ({goto *ca;})  
 #  define EXEC(XT)      ({DEF_CA cfa=(XT); ca=*cfa; goto *ca;})  
 #endif  
   
 #if THREADING_SCHEME==8  /* #warning indirect threading scheme 8: low latency,cisc */
 #warning indirect threading scheme 8: low latency,cisc  
 #  define NEXT_P0  #  define NEXT_P0
   #  define CFA           cfa
 #  define IP            (ip)  #  define IP            (ip)
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  #  define SET_IP(p)     do {ip=(p); NEXT_P0;} while(0)
 #  define NEXT_INST     (*ip)  #  define NEXT_INST     (*ip)
 #  define INC_IP(const_inc)     ({ip+=(const_inc);})  #  define INC_IP(const_inc)     do {ip+=(const_inc);} while(0)
 #  define DEF_CA  #  define DEF_CA
 #  define NEXT_P1  #  define NEXT_P1
 #  define NEXT_P2       ({cfa=*ip++; goto **cfa;})  #  define NEXT_P1_5     do {cfa=*ip++; GOTO(*cfa);} while(0)
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  #  define EXEC1(XT)     ({cfa=(XT); *cfa;})
 #endif  
   
 /* indirect threaded */  /* indirect threaded */
 #endif  #endif
   
 #endif /* !defined(DOUBLY_INDIRECT) */  #endif /* !defined(DOUBLY_INDIRECT) && !defined(NO_IP) */
   
 #define NEXT ({DEF_CA NEXT_P1; NEXT_P2;})  
 #define IPTOS NEXT_INST  

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  Added in v.1.40


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