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Diff for /gforth/engine/threaded.h between versions 1.3 and 1.35

version 1.3, 1999/02/06 22:28:25 version 1.35, 2005/12/31 15:46:13
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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 Free Software Foundation, Inc.
   
   This file is part of Gforth.    This file is part of Gforth.
   
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   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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.    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 91
   
 */  */
   
 #ifndef GETCFA  #ifdef GCC_PR15242_WORKAROUND
 #  define CFA_NEXT  #define DO_GOTO goto before_goto
 /* a more appropriate name would be CFA_LIVE, i.e., cfa is live after NEXT */  #else
   #define DO_GOTO goto *real_ca
   #endif
   #ifndef GOTO_ALIGN
   #define GOTO_ALIGN
 #endif  #endif
   
   #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
   
   
 #ifdef DOUBLY_INDIRECT  #ifdef DOUBLY_INDIRECT
 #  define NEXT_P0       ({cfa=*ip;})  # ifndef DEBUG_DITC
 #  define IP            (ip)  #  define DEBUG_DITC 0
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  # endif
 #  define NEXT_INST     (cfa)  /* define to 1 if you want to check consistency */
 #  define INC_IP(const_inc)     ({cfa=IP[const_inc]; ip+=(const_inc);})  #  define NEXT_P0       do {cfa1=cfa; cfa=*ip;} while(0)
 #  define DEF_CA        Label ca;  #  define CFA           cfa1
 #  define NEXT_P1       ({ip++; ca=**cfa;})  #  define MORE_VARS     Xt cfa1;
 #  define NEXT_P2       ({goto *ca;})  #  define IP            (ip)
 #  define EXEC(XT)      ({DEF_CA cfa=(XT); ca=**cfa; goto *ca;})  #  define SET_IP(p)     do {ip=(p); cfa=*ip;} while(0)
 #  define NEXT1_P1 ({ca = **cfa;})  #  define NEXT_INST     (cfa)
 #  define NEXT1_P2 ({goto *ca;})  #  define INC_IP(const_inc)     do {cfa=IP[const_inc]; ip+=(const_inc);} while(0)
   #  define DEF_CA        Label 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;})
   
   #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;})
   
 #else /* !defined(DOUBLY_INDIRECT) */  #else  /* !defined(DOUBLY_INDIRECT) && !defined(NO_IP) */
   
 #if defined(DIRECT_THREADED)  #if defined(DIRECT_THREADED)
   
 /* note that the "cfa dead" versions only work if GETCFA exists and works */  /* This lets the compiler know that cfa is dead before; we place it at
      "goto *"s that perform direct threaded dispatch (i.e., not EXECUTE
      etc.), and thus do not reach doers, which would use cfa; the only
      way to a doer is through EXECUTE etc., which set the cfa
      themselves.
   
 #if THREADING_SCHEME==1     Some of these direct threaded schemes use "cfa" to hold the code
 #warning direct threading scheme 1: autoinc, long latency, cfa live     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  
 #  define NEXT_P1  
 #  define NEXT_P2       ({goto *cfa;})  
 #  define EXEC(XT)      ({cfa=(XT); goto *cfa;})  
 #endif  
   
 #if THREADING_SCHEME==2     KILLS works by having an empty asm instruction, and claiming to the
 #warning direct threading scheme 2: autoinc, long latency, cfa dead     compiler that it writes to cfa.
 #  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  
   
      KILLS is optional.  You can write
   
 #if THREADING_SCHEME==3  #define KILLS
 #warning direct threading scheme 3: autoinc, 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==4     and lose just a little performance.
 #warning direct threading scheme 4: autoinc, low latency, cfa dead  */
 #  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  
 #  define NEXT_P2       ({goto **(ip++);})  
 #  define EXEC(XT)      ({goto *(XT);})  
 #endif  
   
 #if THREADING_SCHEME==5  
 #warning direct threading scheme 5: long latency, cfa live  
 #  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 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  
   
   
 #if THREADING_SCHEME==7  
 #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  
 #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 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  #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.1.35

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