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Diff for /gforth/engine/threaded.h between versions 1.3 and 1.41

version 1.3, 1999/02/06 22:28:25 version 1.41, 2010/04/05 22:17:56
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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 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., 675 Mass Ave, Cambridge, MA 02139, 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
   
 */  */
   
 #ifndef GETCFA  #if !defined(GCC_PR15242_WORKAROUND)
 #  define CFA_NEXT  #if __GNUC__ == 3
 /* a more appropriate name would be CFA_LIVE, i.e., cfa is live after NEXT */  /* various gcc-3.x version have problems (including PR15242) that are
      solved with this workaround */
   #define GCC_PR15242_WORKAROUND 1
   #else
   /* other gcc versions are better off without the workaround for
      primitives that are not relocatable */
   #define GCC_PR15242_WORKAROUND 0
   #endif
 #endif  #endif
   
 #ifdef DOUBLY_INDIRECT  #if GCC_PR15242_WORKAROUND
 #  define NEXT_P0       ({cfa=*ip;})  #define DO_GOTO goto before_goto
 #  define IP            (ip)  #else
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  #define DO_GOTO goto *real_ca
 #  define NEXT_INST     (cfa)  #endif
 #  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;})  
 #  define NEXT1_P1 ({ca = **cfa;})  
 #  define NEXT1_P2 ({goto *ca;})  
   
 #else /* !defined(DOUBLY_INDIRECT) */  #ifndef GOTO_ALIGN
   #define GOTO_ALIGN
   #endif
   
 #if defined(DIRECT_THREADED)  #define GOTO(target) do {(real_ca=(target));} while(0)
   #define NEXT_P2 do {NEXT_P1_5; DO_GOTO;} while(0)
   #define EXEC(XT) do { real_ca=EXEC1(XT); DO_GOTO;} while (0)
   #define VM_JUMP(target) do {GOTO(target);} while (0)
   #define NEXT do {DEF_CA NEXT_P1; NEXT_P2;} while(0)
   #define FIRST_NEXT_P2 NEXT_P1_5; GOTO_ALIGN; \
   before_goto: goto *real_ca; after_goto:
   #define FIRST_NEXT do {DEF_CA NEXT_P1; FIRST_NEXT_P2;} while(0)
   #define IPTOS NEXT_INST
   
 /* note that the "cfa dead" versions only work if GETCFA exists and works */  
   
 #if THREADING_SCHEME==1  #ifdef DOUBLY_INDIRECT
 #warning direct threading scheme 1: autoinc, long latency, cfa live  # ifndef DEBUG_DITC
 #  define NEXT_P0       ({cfa=*ip++;})  #  define DEBUG_DITC 0
 #  define IP            (ip-1)  # endif
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  /* define to 1 if you want to check consistency */
 #  define NEXT_INST     (cfa)  #  define NEXT_P0       do {cfa1=cfa; cfa=*ip;} while(0)
 #  define INC_IP(const_inc)     ({cfa=IP[const_inc]; ip+=(const_inc);})  #  define CFA           cfa1
 #  define DEF_CA  #  define MORE_VARS     Xt cfa1;
 #  define NEXT_P1  #  define IP            (ip)
 #  define NEXT_P2       ({goto *cfa;})  #  define SET_IP(p)     do {ip=(p); cfa=*ip;} while(0)
 #  define EXEC(XT)      ({cfa=(XT); goto *cfa;})  #  define NEXT_INST     (cfa)
 #endif  #  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+DOER_MAX || 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+DOER_MAX && 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;})
   
   #elif defined(NO_IP)
   
   #define NEXT_P0
   #  define CFA           cfa
   #define SET_IP(target)  assert(0)
   #define INC_IP(n)       ((void)0)
   #define DEF_CA
   #define NEXT_P1
   #define NEXT_P1_5               do {goto *next_code;} while(0)
   /* set next_code to the return address before performing EXEC */
   /* original: */
   /* #define EXEC1(XT)    do {cfa=(XT); goto **cfa;} while(0) */
   /* fake, to make syntax check work */
   #define EXEC1(XT)       ({cfa=(XT); *cfa;})
   
 #if THREADING_SCHEME==2  #else  /* !defined(DOUBLY_INDIRECT) && !defined(NO_IP) */
 #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)      ({goto *(XT);})  
 #endif  
   
   #if defined(DIRECT_THREADED)
   
 #if THREADING_SCHEME==3  /* This lets the compiler know that cfa is dead before; we place it at
 #warning direct threading scheme 3: autoinc, low latency, cfa live     "goto *"s that perform direct threaded dispatch (i.e., not EXECUTE
 #  define NEXT_P0     etc.), and thus do not reach doers, which would use cfa; the only
 #  define IP            (ip)     way to a doer is through EXECUTE etc., which set the cfa
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})     themselves.
 #  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==4     Some of these direct threaded schemes use "cfa" to hold the code
 #warning direct threading scheme 4: autoinc, low latency, cfa dead     address in normal direct threaded code.  Of course we cannot use
 #  define NEXT_P0     KILLS there.
 #  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)      ({goto *(XT);})  
 #endif  
   
 #if THREADING_SCHEME==5     KILLS works by having an empty asm instruction, and claiming to the
 #warning direct threading scheme 5: long latency, cfa live     compiler that it writes to cfa.
 #  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  
 #  define NEXT_P1       (ip++)  
 #  define NEXT_P2       ({goto *cfa;})  
 #  define EXEC(XT)      ({cfa=(XT); goto *cfa;})  
 #endif  
   
 #if THREADING_SCHEME==6     KILLS is optional.  You can write
 #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)      ({goto *(XT);})  
 #endif  
   
   #define KILLS
   
 #if THREADING_SCHEME==7     and lose just a little performance.
 #warning direct threading scheme 7: low latency, cfa live  */
 #  define NEXT_P0  #define KILLS asm("":"=X"(cfa));
 #  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  /* #warning direct threading scheme 8: cfa dead, i386 hack */
 #warning direct threading scheme 8: cfa dead, i386 hack  
 #  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       (ip++)  #  define NEXT_P1       (ip++)
 #  define NEXT_P2       ({goto **(ip-1);})  #  define NEXT_P1_5     do {KILLS GOTO(*(ip-1));} while(0)
 #  define EXEC(XT)      ({goto *(XT);})  #  define EXEC1(XT)     ({cfa=(XT); *cfa;})
 #endif  
   
 #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        Label ca;  
 #  define NEXT_P1       ({ca=next_cfa; cfa=next_cfa; ip++; next_cfa=*ip;})  
 #  define NEXT_P2       ({goto *ca;})  
 #  define EXEC(XT)      ({cfa=(XT); goto *cfa;})  
 #  define MORE_VARS     Xt next_cfa;  
 #endif  
   
 #if THREADING_SCHEME==10  
 #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 */  /* direct threaded */
 #else  #else
 /* indirect THREADED  */  /* indirect THREADED  */
   
 #if THREADING_SCHEME==1  /* #warning indirect threading scheme 8: low latency,cisc */
 #warning indirect threading scheme 1: autoinc, long latency, cisc  
 #  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  
   
 #if THREADING_SCHEME==2  
 #warning indirect threading scheme 2: autoinc, long 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  
   
   
 #if THREADING_SCHEME==3  
 #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  
 #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  
   
   
 #if THREADING_SCHEME==5  
 #warning indirect threading scheme 5: long latency, cisc  
 #  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  
 #  define NEXT_P1       (ip++)  
 #  define NEXT_P2       ({goto **cfa;})  
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  
 #endif  
   
 #if THREADING_SCHEME==6  
 #warning indirect threading scheme 6: long 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==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  
 #  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;})  
   
Removed from v.1.3  
changed lines
  Added in v.1.41

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