path: root/VEX/priv/guest_generic_bb_to_IR.c

/*--------------------------------------------------------------------*/
/*--- begin                               guest_generic_bb_to_IR.c ---*/
/*--------------------------------------------------------------------*/

/*
   This file is part of Valgrind, a dynamic binary instrumentation
   framework.

   Copyright (C) 2004-2013 OpenWorks LLP
      info@open-works.net

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

   The GNU General Public License is contained in the file COPYING.

   Neither the names of the U.S. Department of Energy nor the
   University of California nor the names of its contributors may be
   used to endorse or promote products derived from this software
   without prior written permission.
*/

#include "libvex_basictypes.h"
#include "libvex_ir.h"
#include "libvex.h"
#include "main_util.h"
#include "main_globals.h"
#include "guest_generic_bb_to_IR.h"


/* Forwards .. */
VEX_REGPARM(2)
static UInt genericg_compute_checksum_4al ( HWord first_w32, HWord n_w32s );
VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_1 ( HWord first_w32 );
VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_2 ( HWord first_w32 );
VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_3 ( HWord first_w32 );
VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_4 ( HWord first_w32 );
VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_5 ( HWord first_w32 );
VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_6 ( HWord first_w32 );
VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_7 ( HWord first_w32 );
VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_8 ( HWord first_w32 );
VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_9 ( HWord first_w32 );
VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_10 ( HWord first_w32 );
VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_11 ( HWord first_w32 );
VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_12 ( HWord first_w32 );

VEX_REGPARM(2)
static ULong genericg_compute_checksum_8al ( HWord first_w64, HWord n_w64s );
VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_1 ( HWord first_w64 );
VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_2 ( HWord first_w64 );
VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_3 ( HWord first_w64 );
VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_4 ( HWord first_w64 );
VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_5 ( HWord first_w64 );
VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_6 ( HWord first_w64 );
VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_7 ( HWord first_w64 );
VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_8 ( HWord first_w64 );
VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_9 ( HWord first_w64 );
VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_10 ( HWord first_w64 );
VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_11 ( HWord first_w64 );
VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_12 ( HWord first_w64 );

/* Small helpers */
static Bool const_False ( void* callback_opaque, Addr a ) { 
   return False; 
}

/* Disassemble a complete basic block, starting at guest_IP_start, 
   returning a new IRSB.  The disassembler may chase across basic
   block boundaries if it wishes and if chase_into_ok allows it.
   The precise guest address ranges from which code has been taken
   are written into vge.  guest_IP_bbstart is taken to be the IP in
   the guest's address space corresponding to the instruction at
   &guest_code[0].  

   dis_instr_fn is the arch-specific fn to disassemble on function; it
   is this that does the real work.

   needs_self_check is a callback used to ask the caller which of the
   extents, if any, a self check is required for.  The returned value
   is a bitmask with a 1 in position i indicating that the i'th extent
   needs a check.  Since there can be at most 3 extents, the returned
   values must be between 0 and 7.

   The number of extents which did get a self check (0 to 3) is put in
   n_sc_extents.  The caller already knows this because it told us
   which extents to add checks for, via the needs_self_check callback,
   but we ship the number back out here for the caller's convenience.

   preamble_function is a callback which allows the caller to add
   its own IR preamble (following the self-check, if any).  May be
   NULL.  If non-NULL, the IRSB under construction is handed to 
   this function, which presumably adds IR statements to it.  The
   callback may optionally complete the block and direct bb_to_IR
   not to disassemble any instructions into it; this is indicated
   by the callback returning True.

   offB_CMADDR and offB_CMLEN are the offsets of guest_CMADDR and
   guest_CMLEN.  Since this routine has to work for any guest state,
   without knowing what it is, those offsets have to passed in.

   callback_opaque is a caller-supplied pointer to data which the
   callbacks may want to see.  Vex has no idea what it is.
   (In fact it's a VgInstrumentClosure.)
*/

/* Regarding IP updating.  dis_instr_fn (that does the guest specific
   work of disassembling an individual instruction) must finish the
   resulting IR with "PUT(guest_IP) = ".  Hence in all cases it must
   state the next instruction address.

   If the block is to be ended at that point, then this routine
   (bb_to_IR) will set up the next/jumpkind/offsIP fields so as to
   make a transfer (of the right kind) to "GET(guest_IP)".  Hence if
   dis_instr_fn generates incorrect IP updates we will see it
   immediately (due to jumping to the wrong next guest address).

   However it is also necessary to set this up so it can be optimised
   nicely.  The IRSB exit is defined to update the guest IP, so that
   chaining works -- since the chain_me stubs expect the chain-to
   address to be in the guest state.  Hence what the IRSB next fields
   will contain initially is (implicitly)

   PUT(guest_IP) [implicitly] = GET(guest_IP) [explicit expr on ::next]

   which looks pretty strange at first.  Eg so unconditional branch
   to some address 0x123456 looks like this:

   PUT(guest_IP) = 0x123456;  // dis_instr_fn generates this
   // the exit
   PUT(guest_IP) [implicitly] = GET(guest_IP); exit-Boring

   after redundant-GET and -PUT removal by iropt, we get what we want:

   // the exit
   PUT(guest_IP) [implicitly] = 0x123456; exit-Boring

   This makes the IRSB-end case the same as the side-exit case: update
   IP, then transfer.  There is no redundancy of representation for
   the destination, and we use the destination specified by
   dis_instr_fn, so any errors it makes show up sooner.
*/

IRSB* bb_to_IR ( 
         /*OUT*/VexGuestExtents* vge,
         /*OUT*/UInt*            n_sc_extents,
         /*OUT*/UInt*            n_guest_instrs, /* stats only */
         /*MOD*/VexRegisterUpdates* pxControl,
         /*IN*/ void*            callback_opaque,
         /*IN*/ DisOneInstrFn    dis_instr_fn,
         /*IN*/ const UChar*     guest_code,
         /*IN*/ Addr             guest_IP_bbstart,
         /*IN*/ Bool             (*chase_into_ok)(void*,Addr),
         /*IN*/ VexEndness       host_endness,
         /*IN*/ Bool             sigill_diag,
         /*IN*/ VexArch          arch_guest,
         /*IN*/ const VexArchInfo* archinfo_guest,
         /*IN*/ const VexAbiInfo*  abiinfo_both,
         /*IN*/ IRType           guest_word_type,
         /*IN*/ UInt             (*needs_self_check)
                                    (void*, /*MB_MOD*/VexRegisterUpdates*,
                                            const VexGuestExtents*),
         /*IN*/ Bool             (*preamble_function)(void*,IRSB*),
         /*IN*/ Int              offB_GUEST_CMSTART,
         /*IN*/ Int              offB_GUEST_CMLEN,
         /*IN*/ Int              offB_GUEST_IP,
         /*IN*/ Int              szB_GUEST_IP
      )
{
   Long       delta;
   Int        i, n_instrs, first_stmt_idx;
   Bool       resteerOK, debug_print;
   DisResult  dres;
   IRStmt*    imark;
   IRStmt*    nop;
   static Int n_resteers = 0;
   Int        d_resteers = 0;
   Int        selfcheck_idx = 0;
   IRSB*      irsb;
   Addr       guest_IP_curr_instr;
   IRConst*   guest_IP_bbstart_IRConst = NULL;
   Int        n_cond_resteers_allowed = 2;

   Bool (*resteerOKfn)(void*,Addr) = NULL;

   debug_print = toBool(vex_traceflags & VEX_TRACE_FE);

   /* check sanity .. */
   vassert(sizeof(HWord) == sizeof(void*));
   vassert(vex_control.guest_max_insns >= 1);
   vassert(vex_control.guest_max_insns <= 100);
   vassert(vex_control.guest_chase_thresh >= 0);
   vassert(vex_control.guest_chase_thresh < vex_control.guest_max_insns);
   vassert(guest_word_type == Ity_I32 || guest_word_type == Ity_I64);

   if (guest_word_type == Ity_I32) {
      vassert(szB_GUEST_IP == 4);
      vassert((offB_GUEST_IP % 4) == 0);
   } else {
      vassert(szB_GUEST_IP == 8);
      vassert((offB_GUEST_IP % 8) == 0);
   }

   /* Start a new, empty extent. */
   vge->n_used  = 1;
   vge->base[0] = guest_IP_bbstart;
   vge->len[0]  = 0;
   *n_sc_extents = 0;

   /* And a new IR superblock to dump the result into. */
   irsb = emptyIRSB();

   /* Delta keeps track of how far along the guest_code array we have
      so far gone. */
   delta    = 0;
   n_instrs = 0;
   *n_guest_instrs = 0;

   /* Guest addresses as IRConsts.  Used in self-checks to specify the
      restart-after-discard point. */
   guest_IP_bbstart_IRConst
      = guest_word_type==Ity_I32 
           ? IRConst_U32(toUInt(guest_IP_bbstart))
           : IRConst_U64(guest_IP_bbstart);

   /* Leave 15 spaces in which to put the check statements for a self
      checking translation (up to 3 extents, and 5 stmts required for
      each).  We won't know until later the extents and checksums of
      the areas, if any, that need to be checked. */
   nop = IRStmt_NoOp();
   selfcheck_idx = irsb->stmts_used;
   for (i = 0; i < 3 * 5; i++)
      addStmtToIRSB( irsb, nop );

   /* If the caller supplied a function to add its own preamble, use
      it now. */
   if (preamble_function) {
      Bool stopNow = preamble_function( callback_opaque, irsb );
      if (stopNow) {
         /* The callback has completed the IR block without any guest
            insns being disassembled into it, so just return it at
            this point, even if a self-check was requested - as there
            is nothing to self-check.  The 15 self-check no-ops will
            still be in place, but they are harmless. */
         return irsb;
      }
   }

   /* Process instructions. */
   while (True) {
      vassert(n_instrs < vex_control.guest_max_insns);

      /* Regardless of what chase_into_ok says, is chasing permissible
         at all right now?  Set resteerOKfn accordingly. */
      resteerOK 
         = toBool(
              n_instrs < vex_control.guest_chase_thresh
              /* we can't afford to have a resteer once we're on the
                 last extent slot. */
              && vge->n_used < 3
           );

      resteerOKfn
         = resteerOK ? chase_into_ok : const_False;

      /* n_cond_resteers_allowed keeps track of whether we're still
         allowing dis_instr_fn to chase conditional branches.  It
         starts (at 2) and gets decremented each time dis_instr_fn
         tells us it has chased a conditional branch.  We then
         decrement it, and use it to tell later calls to dis_instr_fn
         whether or not it is allowed to chase conditional
         branches. */
      vassert(n_cond_resteers_allowed >= 0 && n_cond_resteers_allowed <= 2);

      /* This is the IP of the instruction we're just about to deal
         with. */
      guest_IP_curr_instr = guest_IP_bbstart + delta;

      /* This is the irsb statement array index of the first stmt in
         this insn.  That will always be the instruction-mark
         descriptor. */
      first_stmt_idx = irsb->stmts_used;

      /* Add an instruction-mark statement.  We won't know until after
         disassembling the instruction how long it instruction is, so
         just put in a zero length and we'll fix it up later.

         On ARM, the least significant bit of the instr address
         distinguishes ARM vs Thumb instructions.  All instructions
         actually start on at least 2-aligned addresses.  So we need
         to ignore the bottom bit of the insn address when forming the
         IMark's address field, but put that bottom bit in the delta
         field, so that comparisons against guest_R15T for Thumb can
         be done correctly.  By inspecting the delta field,
         instruction processors can determine whether the instruction
         was originally Thumb or ARM.  For more details of this
         convention, see comments on definition of guest_R15T in
         libvex_guest_arm.h. */
      if (arch_guest == VexArchARM && (guest_IP_curr_instr & 1)) {
         /* Thumb insn => mask out the T bit, but put it in delta */
         addStmtToIRSB( irsb,
                        IRStmt_IMark(guest_IP_curr_instr & ~(Addr)1,
                                     0, /* len */
                                     1  /* delta */
                        )
         );
      } else {
         /* All other targets: store IP as-is, and set delta to zero. */
         addStmtToIRSB( irsb,
                        IRStmt_IMark(guest_IP_curr_instr,
                                     0, /* len */
                                     0  /* delta */
                        )
         );
      }

      if (debug_print && n_instrs > 0)
         vex_printf("\n");

      /* Finally, actually disassemble an instruction. */
      vassert(irsb->next == NULL);
      dres = dis_instr_fn ( irsb,
                            resteerOKfn,
                            toBool(n_cond_resteers_allowed > 0),
                            callback_opaque,
                            guest_code,
                            delta,
                            guest_IP_curr_instr,
                            arch_guest,
                            archinfo_guest,
                            abiinfo_both,
                            host_endness,
                            sigill_diag );

      /* stay sane ... */
      vassert(dres.whatNext == Dis_StopHere
              || dres.whatNext == Dis_Continue
              || dres.whatNext == Dis_ResteerU
              || dres.whatNext == Dis_ResteerC);
      /* ... disassembled insn length is sane ... */
      vassert(dres.len >= 0 && dres.len <= 24);
      /* ... continueAt is zero if no resteer requested ... */
      if (dres.whatNext != Dis_ResteerU && dres.whatNext != Dis_ResteerC)
         vassert(dres.continueAt == 0);
      /* ... if we disallowed conditional resteers, check that one
             didn't actually happen anyway ... */
      if (n_cond_resteers_allowed == 0)
         vassert(dres.whatNext != Dis_ResteerC);

      /* Fill in the insn-mark length field. */
      vassert(first_stmt_idx >= 0 && first_stmt_idx < irsb->stmts_used);
      imark = irsb->stmts[first_stmt_idx];
      vassert(imark);
      vassert(imark->tag == Ist_IMark);
      vassert(imark->Ist.IMark.len == 0);
      imark->Ist.IMark.len = dres.len;

      /* Print the resulting IR, if needed. */
      if (vex_traceflags & VEX_TRACE_FE) {
         for (i = first_stmt_idx; i < irsb->stmts_used; i++) {
            vex_printf("              ");
            ppIRStmt(irsb->stmts[i]);
            vex_printf("\n");
         }
      }

      /* Individual insn disassembly may not mess with irsb->next.
         This function is the only place where it can be set. */
      vassert(irsb->next == NULL);
      vassert(irsb->jumpkind == Ijk_Boring);
      vassert(irsb->offsIP == 0);

      /* Individual insn disassembly must finish the IR for each
         instruction with an assignment to the guest PC. */
      vassert(first_stmt_idx < irsb->stmts_used);
      /* it follows that irsb->stmts_used must be > 0 */
      { IRStmt* st = irsb->stmts[irsb->stmts_used-1];
        vassert(st);
        vassert(st->tag == Ist_Put);
        vassert(st->Ist.Put.offset == offB_GUEST_IP);
        /* Really we should also check that the type of the Put'd data
           == guest_word_type, but that's a bit expensive. */
      }

      /* Update the VexGuestExtents we are constructing. */
      /* If vex_control.guest_max_insns is required to be < 100 and
         each insn is at max 20 bytes long, this limit of 5000 then
         seems reasonable since the max possible extent length will be
         100 * 20 == 2000. */
      vassert(vge->len[vge->n_used-1] < 5000);
      vge->len[vge->n_used-1] 
         = toUShort(toUInt( vge->len[vge->n_used-1] + dres.len ));
      n_instrs++;

      /* Advance delta (inconspicuous but very important :-) */
      delta += (Long)dres.len;

      switch (dres.whatNext) {
         case Dis_Continue:
            vassert(dres.continueAt == 0);
            vassert(dres.jk_StopHere == Ijk_INVALID);
            if (n_instrs < vex_control.guest_max_insns) {
               /* keep going */
            } else {
               /* We have to stop.  See comment above re irsb field
                  settings here. */
               irsb->next = IRExpr_Get(offB_GUEST_IP, guest_word_type);
               /* irsb->jumpkind must already by Ijk_Boring */
               irsb->offsIP = offB_GUEST_IP;
               goto done;
            }
            break;
         case Dis_StopHere:
            vassert(dres.continueAt == 0);
            vassert(dres.jk_StopHere != Ijk_INVALID);
            /* See comment above re irsb field settings here. */
            irsb->next = IRExpr_Get(offB_GUEST_IP, guest_word_type);
            irsb->jumpkind = dres.jk_StopHere;
            irsb->offsIP = offB_GUEST_IP;
            goto done;

         case Dis_ResteerU:
         case Dis_ResteerC:
            /* Check that we actually allowed a resteer .. */
            vassert(resteerOK);
            if (dres.whatNext == Dis_ResteerC) {
               vassert(n_cond_resteers_allowed > 0);
               n_cond_resteers_allowed--;
            }
            /* figure out a new delta to continue at. */
            vassert(resteerOKfn(callback_opaque,dres.continueAt));
            delta = dres.continueAt - guest_IP_bbstart;
            /* we now have to start a new extent slot. */
            vge->n_used++;
            vassert(vge->n_used <= 3);
            vge->base[vge->n_used-1] = dres.continueAt;
            vge->len[vge->n_used-1] = 0;
            n_resteers++;
            d_resteers++;
            if (0 && (n_resteers & 0xFF) == 0)
            vex_printf("resteer[%d,%d] to 0x%lx (delta = %lld)\n",
                       n_resteers, d_resteers,
                       dres.continueAt, delta);
            break;
         default:
            vpanic("bb_to_IR");
      }
   }
   /*NOTREACHED*/
   vassert(0);

  done:
   /* We're done.  The only thing that might need attending to is that
      a self-checking preamble may need to be created.  If so it gets
      placed in the 15 slots reserved above.

      The scheme is to compute a rather crude checksum of the code
      we're making a translation of, and add to the IR a call to a
      helper routine which recomputes the checksum every time the
      translation is run, and requests a retranslation if it doesn't
      match.  This is obviously very expensive and considerable
      efforts are made to speed it up:

      * the checksum is computed from all the naturally aligned
        host-sized words that overlap the translated code.  That means
        it could depend on up to 7 bytes before and 7 bytes after
        which aren't part of the translated area, and so if those
        change then we'll unnecessarily have to discard and
        retranslate.  This seems like a pretty remote possibility and
        it seems as if the benefit of not having to deal with the ends
        of the range at byte precision far outweigh any possible extra
        translations needed.

      * there's a generic routine and 12 specialised cases, which
        handle the cases of 1 through 12-word lengths respectively.
        They seem to cover about 90% of the cases that occur in
        practice.

      We ask the caller, via needs_self_check, which of the 3 vge
      extents needs a check, and only generate check code for those
      that do.
   */
   {
      Addr     base2check;
      UInt     len2check;
      HWord    expectedhW;
      IRTemp   tistart_tmp, tilen_tmp;
      HWord    VEX_REGPARM(2) (*fn_generic)(HWord, HWord);
      HWord    VEX_REGPARM(1) (*fn_spec)(HWord);
      const HChar* nm_generic;
      const HChar* nm_spec;
      HWord    fn_generic_entry = 0;
      HWord    fn_spec_entry = 0;
      UInt     host_word_szB = sizeof(HWord);
      IRType   host_word_type = Ity_INVALID;

      UInt extents_needing_check
         = needs_self_check(callback_opaque, pxControl, vge);

      if (host_word_szB == 4) host_word_type = Ity_I32;
      if (host_word_szB == 8) host_word_type = Ity_I64;
      vassert(host_word_type != Ity_INVALID);

      vassert(vge->n_used >= 1 && vge->n_used <= 3);

      /* Caller shouldn't claim that nonexistent extents need a
         check. */
      vassert((extents_needing_check >> vge->n_used) == 0);

      for (i = 0; i < vge->n_used; i++) {

         /* Do we need to generate a check for this extent? */
         if ((extents_needing_check & (1 << i)) == 0)
            continue;

         /* Tell the caller */
         (*n_sc_extents)++;

         /* the extent we're generating a check for */
         base2check = vge->base[i];
         len2check  = vge->len[i];

         /* stay sane */
         vassert(len2check >= 0 && len2check < 1000/*arbitrary*/);

         /* Skip the check if the translation involved zero bytes */
         if (len2check == 0)
            continue;

         HWord first_hW = ((HWord)base2check)
                          & ~(HWord)(host_word_szB-1);
         HWord last_hW  = (((HWord)base2check) + len2check - 1)
                          & ~(HWord)(host_word_szB-1);
         vassert(first_hW <= last_hW);
         HWord hW_diff = last_hW - first_hW;
         vassert(0 == (hW_diff & (host_word_szB-1)));
         HWord hWs_to_check = (hW_diff + host_word_szB) / host_word_szB;
         vassert(hWs_to_check > 0
                 && hWs_to_check < 1004/*arbitrary*/ / host_word_szB);

         /* vex_printf("%lx %lx  %ld\n", first_hW, last_hW, hWs_to_check); */

         if (host_word_szB == 8) {
            fn_generic =  (VEX_REGPARM(2) HWord(*)(HWord, HWord))
                          genericg_compute_checksum_8al;
            nm_generic = "genericg_compute_checksum_8al";
         } else {
            fn_generic =  (VEX_REGPARM(2) HWord(*)(HWord, HWord))
                          genericg_compute_checksum_4al;
            nm_generic = "genericg_compute_checksum_4al";
         }

         fn_spec = NULL;
         nm_spec = NULL;

         if (host_word_szB == 8) {
            const HChar* nm = NULL;
            ULong  VEX_REGPARM(1) (*fn)(HWord)  = NULL;
            switch (hWs_to_check) {
               case 1:  fn =  genericg_compute_checksum_8al_1;
                        nm = "genericg_compute_checksum_8al_1"; break;
               case 2:  fn =  genericg_compute_checksum_8al_2;
                        nm = "genericg_compute_checksum_8al_2"; break;
               case 3:  fn =  genericg_compute_checksum_8al_3;
                        nm = "genericg_compute_checksum_8al_3"; break;
               case 4:  fn =  genericg_compute_checksum_8al_4;
                        nm = "genericg_compute_checksum_8al_4"; break;
               case 5:  fn =  genericg_compute_checksum_8al_5;
                        nm = "genericg_compute_checksum_8al_5"; break;
               case 6:  fn =  genericg_compute_checksum_8al_6;
                        nm = "genericg_compute_checksum_8al_6"; break;
               case 7:  fn =  genericg_compute_checksum_8al_7;
                        nm = "genericg_compute_checksum_8al_7"; break;
               case 8:  fn =  genericg_compute_checksum_8al_8;
                        nm = "genericg_compute_checksum_8al_8"; break;
               case 9:  fn =  genericg_compute_checksum_8al_9;
                        nm = "genericg_compute_checksum_8al_9"; break;
               case 10: fn =  genericg_compute_checksum_8al_10;
                        nm = "genericg_compute_checksum_8al_10"; break;
               case 11: fn =  genericg_compute_checksum_8al_11;
                        nm = "genericg_compute_checksum_8al_11"; break;
               case 12: fn =  genericg_compute_checksum_8al_12;
                        nm = "genericg_compute_checksum_8al_12"; break;
               default: break;
            }
            fn_spec = (VEX_REGPARM(1) HWord(*)(HWord)) fn;
            nm_spec = nm;
         } else {
            const HChar* nm = NULL;
            UInt   VEX_REGPARM(1) (*fn)(HWord) = NULL;
            switch (hWs_to_check) {
               case 1:  fn =  genericg_compute_checksum_4al_1;
                        nm = "genericg_compute_checksum_4al_1"; break;
               case 2:  fn =  genericg_compute_checksum_4al_2;
                        nm = "genericg_compute_checksum_4al_2"; break;
               case 3:  fn =  genericg_compute_checksum_4al_3;
                        nm = "genericg_compute_checksum_4al_3"; break;
               case 4:  fn =  genericg_compute_checksum_4al_4;
                        nm = "genericg_compute_checksum_4al_4"; break;
               case 5:  fn =  genericg_compute_checksum_4al_5;
                        nm = "genericg_compute_checksum_4al_5"; break;
               case 6:  fn =  genericg_compute_checksum_4al_6;
                        nm = "genericg_compute_checksum_4al_6"; break;
               case 7:  fn =  genericg_compute_checksum_4al_7;
                        nm = "genericg_compute_checksum_4al_7"; break;
               case 8:  fn =  genericg_compute_checksum_4al_8;
                        nm = "genericg_compute_checksum_4al_8"; break;
               case 9:  fn =  genericg_compute_checksum_4al_9;
                        nm = "genericg_compute_checksum_4al_9"; break;
               case 10: fn =  genericg_compute_checksum_4al_10;
                        nm = "genericg_compute_checksum_4al_10"; break;
               case 11: fn =  genericg_compute_checksum_4al_11;
                        nm = "genericg_compute_checksum_4al_11"; break;
               case 12: fn =  genericg_compute_checksum_4al_12;
                        nm = "genericg_compute_checksum_4al_12"; break;
               default: break;
            }
            fn_spec = (VEX_REGPARM(1) HWord(*)(HWord))fn;
            nm_spec = nm;
         }

         expectedhW = fn_generic( first_hW, hWs_to_check );
         /* If we got a specialised version, check it produces the same
            result as the generic version! */
         if (fn_spec) {
            vassert(nm_spec);
            vassert(expectedhW == fn_spec( first_hW ));
         } else {
            vassert(!nm_spec);
         }

         /* Set CMSTART and CMLEN.  These will describe to the despatcher
            the area of guest code to invalidate should we exit with a
            self-check failure. */

         tistart_tmp = newIRTemp(irsb->tyenv, guest_word_type);
         tilen_tmp   = newIRTemp(irsb->tyenv, guest_word_type);

         IRConst* base2check_IRConst
            = guest_word_type==Ity_I32 ? IRConst_U32(toUInt(base2check))
                                       : IRConst_U64(base2check);
         IRConst* len2check_IRConst
            = guest_word_type==Ity_I32 ? IRConst_U32(len2check)
                                       : IRConst_U64(len2check);

         irsb->stmts[selfcheck_idx + i * 5 + 0]
            = IRStmt_WrTmp(tistart_tmp, IRExpr_Const(base2check_IRConst) );

         irsb->stmts[selfcheck_idx + i * 5 + 1]
            = IRStmt_WrTmp(tilen_tmp, IRExpr_Const(len2check_IRConst) );

         irsb->stmts[selfcheck_idx + i * 5 + 2]
            = IRStmt_Put( offB_GUEST_CMSTART, IRExpr_RdTmp(tistart_tmp) );

         irsb->stmts[selfcheck_idx + i * 5 + 3]
            = IRStmt_Put( offB_GUEST_CMLEN, IRExpr_RdTmp(tilen_tmp) );

         /* Generate the entry point descriptors */
         if (abiinfo_both->host_ppc_calls_use_fndescrs) {
            HWord* descr = (HWord*)fn_generic;
            fn_generic_entry = descr[0];
            if (fn_spec) {
               descr = (HWord*)fn_spec;
               fn_spec_entry = descr[0];
            } else {
               fn_spec_entry = (HWord)NULL;
            }
         } else {
            fn_generic_entry = (HWord)fn_generic;
            if (fn_spec) {
               fn_spec_entry = (HWord)fn_spec;
            } else {
               fn_spec_entry = (HWord)NULL;
            }
         }

         IRExpr* callexpr = NULL;
         if (fn_spec) {
            callexpr = mkIRExprCCall( 
                          host_word_type, 1/*regparms*/, 
                          nm_spec, (void*)fn_spec_entry,
                          mkIRExprVec_1(
                             mkIRExpr_HWord( (HWord)first_hW )
                          )
                       );
         } else {
            callexpr = mkIRExprCCall( 
                          host_word_type, 2/*regparms*/, 
                          nm_generic, (void*)fn_generic_entry,
                          mkIRExprVec_2(
                             mkIRExpr_HWord( (HWord)first_hW ),
                             mkIRExpr_HWord( (HWord)hWs_to_check )
                          )
                       );
         }

         irsb->stmts[selfcheck_idx + i * 5 + 4]
            = IRStmt_Exit( 
                 IRExpr_Binop( 
                    host_word_type==Ity_I64 ? Iop_CmpNE64 : Iop_CmpNE32,
                    callexpr,
                       host_word_type==Ity_I64
                          ? IRExpr_Const(IRConst_U64(expectedhW))
                          : IRExpr_Const(IRConst_U32(expectedhW))
                 ),
                 Ijk_InvalICache,
                 /* Where we must restart if there's a failure: at the
                    first extent, regardless of which extent the
                    failure actually happened in. */
                 guest_IP_bbstart_IRConst,
                 offB_GUEST_IP
              );
      } /* for (i = 0; i < vge->n_used; i++) */
   }

   /* irsb->next must now be set, since we've finished the block.
      Print it if necessary.*/
   vassert(irsb->next != NULL);
   if (debug_print) {
      vex_printf("              ");
      vex_printf( "PUT(%d) = ", irsb->offsIP);
      ppIRExpr( irsb->next );
      vex_printf( "; exit-");
      ppIRJumpKind(irsb->jumpkind);
      vex_printf( "\n");
      vex_printf( "\n");
   }

   *n_guest_instrs = n_instrs;
   return irsb;
}


/*-------------------------------------------------------------
  A support routine for doing self-checking translations. 
  -------------------------------------------------------------*/

/* CLEAN HELPER */
/* CALLED FROM GENERATED CODE */

/* Compute a checksum of host memory at [addr .. addr+len-1], as fast
   as possible.  All _4al versions assume that the supplied address is
   4 aligned.  All length values are in 4-byte chunks.  These fns
   arecalled once for every use of a self-checking translation, so
   they needs to be as fast as possible. */

/* --- 32-bit versions, used only on 32-bit hosts --- */

static inline UInt ROL32 ( UInt w, Int n ) {
   w = (w << n) | (w >> (32-n));
   return w;
}

VEX_REGPARM(2)
static UInt genericg_compute_checksum_4al ( HWord first_w32, HWord n_w32s )
{
   UInt  sum1 = 0, sum2 = 0;
   UInt* p = (UInt*)first_w32;
   /* unrolled */
   while (n_w32s >= 4) {
      UInt  w;
      w = p[0];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
      w = p[1];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
      w = p[2];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
      w = p[3];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
      p += 4;
      n_w32s -= 4;
      sum1 ^= sum2;
   }
   while (n_w32s >= 1) {
      UInt  w;
      w = p[0];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
      p += 1;
      n_w32s -= 1;
      sum1 ^= sum2;
   }
   return sum1 + sum2;
}

/* Specialised versions of the above function */

VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_1 ( HWord first_w32 )
{
   UInt  sum1 = 0, sum2 = 0;
   UInt* p = (UInt*)first_w32;
   UInt  w;
   w = p[0];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_2 ( HWord first_w32 )
{
   UInt  sum1 = 0, sum2 = 0;
   UInt* p = (UInt*)first_w32;
   UInt  w;
   w = p[0];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[1];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_3 ( HWord first_w32 )
{
   UInt  sum1 = 0, sum2 = 0;
   UInt* p = (UInt*)first_w32;
   UInt  w;
   w = p[0];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[1];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[2];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_4 ( HWord first_w32 )
{
   UInt  sum1 = 0, sum2 = 0;
   UInt* p = (UInt*)first_w32;
   UInt  w;
   w = p[0];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[1];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[2];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[3];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_5 ( HWord first_w32 )
{
   UInt  sum1 = 0, sum2 = 0;
   UInt* p = (UInt*)first_w32;
   UInt  w;
   w = p[0];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[1];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[2];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[3];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_6 ( HWord first_w32 )
{
   UInt  sum1 = 0, sum2 = 0;
   UInt* p = (UInt*)first_w32;
   UInt  w;
   w = p[0];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[1];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[2];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[3];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[5];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_7 ( HWord first_w32 )
{
   UInt  sum1 = 0, sum2 = 0;
   UInt* p = (UInt*)first_w32;
   UInt  w;
   w = p[0];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[1];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[2];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[3];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[5];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[6];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_8 ( HWord first_w32 )
{
   UInt  sum1 = 0, sum2 = 0;
   UInt* p = (UInt*)first_w32;
   UInt  w;
   w = p[0];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[1];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[2];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[3];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[5];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[6];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[7];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_9 ( HWord first_w32 )
{
   UInt  sum1 = 0, sum2 = 0;
   UInt* p = (UInt*)first_w32;
   UInt  w;
   w = p[0];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[1];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[2];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[3];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[5];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[6];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[7];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[8];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_10 ( HWord first_w32 )
{
   UInt  sum1 = 0, sum2 = 0;
   UInt* p = (UInt*)first_w32;
   UInt  w;
   w = p[0];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[1];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[2];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[3];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[5];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[6];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[7];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[8];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[9];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_11 ( HWord first_w32 )
{
   UInt  sum1 = 0, sum2 = 0;
   UInt* p = (UInt*)first_w32;
   UInt  w;
   w = p[0];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[1];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[2];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[3];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[5];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[6];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[7];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[8];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[9];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[10]; sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static UInt genericg_compute_checksum_4al_12 ( HWord first_w32 )
{
   UInt  sum1 = 0, sum2 = 0;
   UInt* p = (UInt*)first_w32;
   UInt  w;
   w = p[0];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[1];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[2];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[3];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[5];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[6];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[7];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   w = p[8];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[9];  sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[10]; sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   w = p[11]; sum1 = ROL32(sum1 ^ w, 31);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}


/* --- 64-bit versions, used only on 64-bit hosts --- */

static inline ULong ROL64 ( ULong w, Int n ) {
   w = (w << n) | (w >> (64-n));
   return w;
}

VEX_REGPARM(2)
static ULong genericg_compute_checksum_8al ( HWord first_w64, HWord n_w64s )
{
   ULong  sum1 = 0, sum2 = 0;
   ULong* p = (ULong*)first_w64;
   /* unrolled */
   while (n_w64s >= 4) {
      ULong  w;
      w = p[0];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
      w = p[1];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
      w = p[2];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
      w = p[3];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
      p += 4;
      n_w64s -= 4;
      sum1 ^= sum2;
   }
   while (n_w64s >= 1) {
      ULong  w;
      w = p[0];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
      p += 1;
      n_w64s -= 1;
      sum1 ^= sum2;
   }
   return sum1 + sum2;
}

/* Specialised versions of the above function */

VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_1 ( HWord first_w64 )
{
   ULong  sum1 = 0, sum2 = 0;
   ULong* p = (ULong*)first_w64;
   ULong  w;
   w = p[0];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_2 ( HWord first_w64 )
{
   ULong  sum1 = 0, sum2 = 0;
   ULong* p = (ULong*)first_w64;
   ULong  w;
   w = p[0];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[1];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_3 ( HWord first_w64 )
{
   ULong  sum1 = 0, sum2 = 0;
   ULong* p = (ULong*)first_w64;
   ULong  w;
   w = p[0];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[1];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[2];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_4 ( HWord first_w64 )
{
   ULong  sum1 = 0, sum2 = 0;
   ULong* p = (ULong*)first_w64;
   ULong  w;
   w = p[0];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[1];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[2];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[3];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_5 ( HWord first_w64 )
{
   ULong  sum1 = 0, sum2 = 0;
   ULong* p = (ULong*)first_w64;
   ULong  w;
   w = p[0];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[1];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[2];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[3];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_6 ( HWord first_w64 )
{
   ULong  sum1 = 0, sum2 = 0;
   ULong* p = (ULong*)first_w64;
   ULong  w;
   w = p[0];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[1];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[2];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[3];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[5];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_7 ( HWord first_w64 )
{
   ULong  sum1 = 0, sum2 = 0;
   ULong* p = (ULong*)first_w64;
   ULong  w;
   w = p[0];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[1];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[2];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[3];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[5];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[6];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_8 ( HWord first_w64 )
{
   ULong  sum1 = 0, sum2 = 0;
   ULong* p = (ULong*)first_w64;
   ULong  w;
   w = p[0];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[1];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[2];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[3];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[5];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[6];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[7];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_9 ( HWord first_w64 )
{
   ULong  sum1 = 0, sum2 = 0;
   ULong* p = (ULong*)first_w64;
   ULong  w;
   w = p[0];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[1];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[2];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[3];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[5];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[6];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[7];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[8];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_10 ( HWord first_w64 )
{
   ULong  sum1 = 0, sum2 = 0;
   ULong* p = (ULong*)first_w64;
   ULong  w;
   w = p[0];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[1];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[2];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[3];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[5];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[6];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[7];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[8];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[9];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_11 ( HWord first_w64 )
{
   ULong  sum1 = 0, sum2 = 0;
   ULong* p = (ULong*)first_w64;
   ULong  w;
   w = p[0];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[1];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[2];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[3];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[5];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[6];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[7];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[8];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[9];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[10]; sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

VEX_REGPARM(1)
static ULong genericg_compute_checksum_8al_12 ( HWord first_w64 )
{
   ULong  sum1 = 0, sum2 = 0;
   ULong* p = (ULong*)first_w64;
   ULong  w;
   w = p[0];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[1];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[2];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[3];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[4];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[5];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[6];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[7];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   w = p[8];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[9];  sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[10]; sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   w = p[11]; sum1 = ROL64(sum1 ^ w, 63);  sum2 += w;
   sum1 ^= sum2;
   return sum1 + sum2;
}

/*--------------------------------------------------------------------*/
/*--- end                                 guest_generic_bb_to_IR.c ---*/
/*--------------------------------------------------------------------*/