Return-Path: <gmb@ncrcol.columbiasc.NCR.COM>
Date: Thu, 30 Apr 92 14:29:03 EDT
Message-Id: <9204301829.AA04307@ncrcol.ncr.com>
From: ncrcol!gmb@ncrcol.columbiasc.NCR.COM
Subject: pcm patch.3 

Here is patch.3 for pcm.  The TEST AX instruction was
not setting the flags correctly.  Additional functionality
is also added for REP SCAS instructions.

Gary Beihl (gary.beihl@columbiasc.ncr.com)
------
 
*** /tmp/,RCSt1a08496	Thu Apr 30 14:18:13 1992
--- logical.c	Thu Apr 30 14:08:15 1992
***************
*** 195,201 ****
  unsigned char *i_a9(pc)
  unsigned char *pc; {
    FL1L = AL & *pc++;
!   FL2H = AH & *pc++;
    PFLAG1(WBOOL);
    return pc;
  }
--- 195,201 ----
  unsigned char *i_a9(pc)
  unsigned char *pc; {
    FL1L = AL & *pc++;
!   FL1H = AH & *pc++;
    PFLAG1(WBOOL);
    return pc;
  }
*** /tmp/,RCSt1a08617	Thu Apr 30 14:38:22 1992
--- mov.c	Thu Apr 30 14:22:08 1992
***************
*** 422,427 ****
--- 422,428 ----
    unsigned char rep_code;
    unsigned char *repds;
    unsigned char *srcptr, *dstptr;
+   unsigned short opr1;
    int count, samt;
    repds = DSEA;
  again_f2:
***************
*** 472,477 ****
--- 473,499 ----
      dstptr -= count;
      CARRY = ((unsigned int)AL < (unsigned int)*dstptr);
    break;
+   case 0xaf:
+     count = DIRECTION ? -2 : 2;
+     dstptr = ESPTR + DI;
+     ZERO = 0;
+     FLAGS_OK = 1;
+     while (CX) {
+       if (*dstptr == AL && *(dstptr+1) == AH) {
+         ZERO = 1;
+         dstptr += count;
+         DI += count;
+         CX--;
+         break;
+       }
+       dstptr += count;
+       DI += count;
+       CX--;
+     }
+     dstptr -= count;
+     opr1 = *dstptr | (unsigned int)*(dstptr+1) << 8;
+     CARRY = AX < opr1;
+   break;
    default: printf("i_f2: ");
      return unk_op(pc); break;
    }
***************
*** 590,595 ****
--- 612,637 ----
      }
      DI = dstptr - ESPTR;
    break;
+   case 0xae:
+     count = DIRECTION ? -1 : 1;
+     dstptr = ESPTR + DI;
+     ZERO = 1;
+     FLAGS_OK = 1;
+     while (CX) {
+       if (*dstptr != AL) {
+         ZERO = 0;
+         dstptr += count;
+         DI += count;
+         CX--;
+         break;
+       }
+       dstptr += count;
+       DI += count;
+       CX--;
+     }
+     dstptr -= count;
+     CARRY = ((unsigned int)AL < (unsigned int)*dstptr);
+   break;
    case 0xaf:
      count = DIRECTION ? -2 : 2;
      dstptr = ESPTR + DI;
***************
*** 611,617 ****
      opr1 = *dstptr | (unsigned int)*(dstptr+1) << 8;
      CARRY = AX < opr1;
    break;
!   default: return unk_op(pc); break;
    }
    return pc;
  }
--- 653,660 ----
      opr1 = *dstptr | (unsigned int)*(dstptr+1) << 8;
      CARRY = AX < opr1;
    break;
!   default:  printf("i_f3: ");
!     return unk_op(pc); break;
    }
    return pc;
  }