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C 7.5 compiler bug

woody baker

I tried to submit this via the email to tech support page but it gave me a 500 error.
I have a hard time believing that I am the only person this has happened to, but clearly
this is a compiler bug in Keil 8051 version 7.5 compiler.
I hope that someone can get this to the correct person at Keil.

4747   1          if(chksum != CWORD[0xF800])
4748   1              {
4749   2              cstate=1;
4750   2              }
4751   1          if(chksum != CWORD[0xF900])
4752   1              {
4753   2              cstate=1;
4754   2              }
4755   1          if(chksum != CWORD[0xFA00])
4756   1              {
4757   2              cstate=1;
4758   2              }
4759   1          if(chksum != CWORD[0xFB00])
4760   1              {
4761   2              cstate=1;
4762   2              }
4763   1          if(chksum != CWORD[0xFC00])
4764   1              {
4765   2              cstate=1;
4766   2              }
4767   1          if(chksum != CWORD[0xFd00])
4768   1              {
4769   2              cstate=1;
4770   2              }
4771   1
4772   1          if(chksum != CWORD[0xFE00])
4773   1              {
4774   2              cstate=1;
4775   2              }


                                           ; SOURCE LINE # 4747
0645 90F000            MOV     DPTR,#0F000H <<<<<<<<<<<< should be F800
0648 7800        R     MOV     R0,#LOW chksum
064A E6                MOV     A,@R0
064B FE                MOV     R6,A
064C 08                INC     R0
C51 COMPILER V7.50   MEDBEST040_LCD                                                        10/03/2012 12:30:27 PAGE 300

064D E6                MOV     A,@R0
064E FF                MOV     R7,A
064F 7401              MOV     A,#01H
0651 93                MOVC    A,@A+DPTR
0652 6F                XRL     A,R7
0653 7003              JNZ     ?C1279
0655 E4                CLR     A
0656 93                MOVC    A,@A+DPTR
0657 6E                XRL     A,R6
0658         ?C1279:
0658 6006              JZ      ?C0032
                                           ; SOURCE LINE # 4748
                                           ; SOURCE LINE # 4751
0660 90F200            MOV     DPTR,#0F200H   <<<<<<<<<<<<<<<<<<< should be F900
...
                                           ; SOURCE LINE # 4755
0674 90F400            MOV     DPTR,#0F400H   <<<<<<<<<<<<<<<<<<< should be FA00
...
                                           ; SOURCE LINE # 4759
068F 90F600            MOV     DPTR,#0F600H   <<<<<<<<<<<<<<<<<<< should be FB00
...
                                           ; SOURCE LINE # 4763
06AA 90F800            MOV     DPTR,#0F800H   <<<<<<<<<<<<<<<<<<< should be FC00
...
                                           ; SOURCE LINE # 4767
06BE 90FA00            MOV     DPTR,#0FA00H   <<<<<<<<<<<<<<<<<<< should be FD00
...
                                           ; SOURCE LINE # 4772
06D9 90FC00            MOV     DPTR,#0FC00H   <<<<<<<<<<<<<<<<<<< should be FE00



 While this works.
15430  01          FLSCL=0x01;               // enable flash write/erase
15431  01          PSCTL=0x01;                     // BUGG  NOT 2, which would erase flash, but 1write to flash
15432  01          *write_ptr=CBYTE[0xFA00];
15433  01          PSCTL = 0x00;              // MOVX writes target XRAM
15434  01          FLSCL=0;                // disable flash write


 000C 75B701            MOV     FLSCL,#01H
                                           ; SOURCE LINE # 15431
000F 758F01            MOV     PSCTL,#01H
                                           ; SOURCE LINE # 15432
0012 90FA00            MOV     DPTR,#0FA00H
0015 E4                CLR     A
0016 93                MOVC    A,@A+DPTR
0017 8F82              MOV     DPL,R7
0019 8E83              MOV     DPH,R6
001B F0                MOVX    @DPTR,A
                                           ; SOURCE LINE # 15433
001C E4                CLR     A
001D F58F              MOV     PSCTL,A
                                           ; SOURCE LINE # 15434
001F F5B7              MOV     FLSCL,A

Parents
  • 0 in reply to ²erik malund

    not recalling using CWORD, I looked it up. WHAT A TRAP.

    Well, in all fairness given the way it's used, it couldn't possibly have been any different. Something that can be followed by an [index] and yield a 16-bit word from code memory pretty much has to be a 16-bit pointer, and that means the index can't help but count in two-byte steps.

Reply
  • 0 in reply to ²erik malund

    not recalling using CWORD, I looked it up. WHAT A TRAP.

    Well, in all fairness given the way it's used, it couldn't possibly have been any different. Something that can be followed by an [index] and yield a 16-bit word from code memory pretty much has to be a 16-bit pointer, and that means the index can't help but count in two-byte steps.

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