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C51: Newer version creates larger code??

Grant B

I have 3 projects that I am porting from an old uV4 toolset to newer uV5 toolset. In all cases the new code is 5% to 10% larger and this is causing some issues.  As far as I can see, all the settings match. Is there something I am missing here, or is this a known issue with the newer tools?? Some of my projects are VERY tight for space.

Example: Old then New

C51:    BROWSE DEBUG OBJECTEXTEND PRINT(.\lst\*.lst) TABS (3)
A51:    SET (SMALL) DEBUG PRINT(.\lst\*.lst) EP

Program Size: data=54.0 xdata=945 code=6164

IDE-Version: µVision V4.72.9.0

Tool Version Numbers:
Toolchain:        PK51 Prof. Developers Kit  Version: 9.52.0.0
Toolchain Path:    C:\Keil\C51\BIN
C Compiler:         C51.Exe       V9.52.0.0
Assembler:          A51.Exe       V8.02b
Linker/Locator:     BL51.Exe       V6.22
Librarian:             LIB51.Exe       V4.29
Hex Converter:      OH51.Exe       V2.7.0.0
CPU DLL:               S8051.DLL       V3.91.0.0
Dialog DLL:         DCYG.DLL       V2.72.0.0



C51:    OPTIMIZE (8,SPEED) BROWSE DEBUG OBJECTEXTEND PRINT(.\lst\*.lst) TABS (3)
A51:    SET (SMALL) DEBUG PRINT(.\lst\*.lst) EP

Program Size: data=54.0 xdata=945 code=6405

IDE-Version: µVision V5.25.3.0

Tool Version Numbers:
Toolchain:        PK51 Prof. Developers Kit for SiLabs  Version: 9.59.0.0
Toolchain Path:    C:\Keil_v5\C51\BIN
C Compiler:         C51.exe    V9.59.0.0
Assembler:          A51.exe    V8.2.7.0
Linker/Locator:     BL51.exe    V6.22.2.0
Librarian:             LIB51.exe    V4.30.1.0
Hex Converter:      OH51.exe    V2.7.0.0
CPU DLL:               S8051.DLL            V3.122.0.0
Dialog DLL:         DCYG.DLL             V2.75.0.0

Parents Reply Children
  • 0 in reply to Andy Neil

    Good Question. I would say that many things are a little larger. :-)  StartUp and constant data is the same, as one would expect.  Here are some function side-by-side comparisons.  "N" lines are the newer compiler. I wonder if some optimization is getting ignored or something.

    Edit: fixed first line indent
            CODE    00AEH     0048H     UNIT         ?PR?LOADEP1INFIFO?USBLIB
N           CODE    1437H     0056H     UNIT         ?PR?LOADEP1INFIFO?USBLIB

            CODE    0118H     04E1H     UNIT         ?PR?HOSTCMDEXEC?HOSTCMD
N           CODE    0118H     053DH     UNIT         ?PR?HOSTCMDEXEC?HOSTCMD

            CODE    05F9H     020BH     UNIT         ?PR?HANDLE_SETUP?USBINT
N           CODE    0655H     020CH     UNIT         ?PR?HANDLE_SETUP?USBINT

            CODE    0804H     016FH     UNIT         ?PR?GET_DESCRIPTOR?USBLIB
N           CODE    0861H     0178H     UNIT         ?PR?GET_DESCRIPTOR?USBLIB
 
            CODE    0973H     00E7H     UNIT         ?PR?MAIN?MAIN
N           CODE    09D9H     00E8H     UNIT         ?PR?MAIN?MAIN

            CODE    0A5AH     00CEH     UNIT         ?PR?GET_STATUS?USBLIB
N           CODE    0AC1H     00D7H     UNIT         ?PR?GET_STATUS?USBLIB

            CODE    0B28H     00B2H     UNIT         ?CO?USBDESCR
N           CODE    0B98H     00B2H     UNIT         ?CO?USBDESCR

            CODE    0BDAH     00ABH     UNIT         ?C_C51STARTUP
N           CODE    0C4AH     00ABH     UNIT         ?C_C51STARTUP

            CODE    0C85H     00AAH     UNIT         ?PR?_FLASHWRITEBLOCK?FLASH
N           CODE    0CF5H     00AAH     UNIT         ?PR?_FLASHWRITEBLOCK?FLASH

            CODE    0D2FH     00A4H     UNIT         ?C?LIB_CODE
N           CODE    0E47H     00A4H     UNIT         ?C?LIB_CODE

            CODE    0DD3H     0098H     UNIT         ?PR?USB0_ISR?USBINT
N           CODE    101FH     0098H     UNIT         ?PR?USB0_ISR?USBINT
 
            CODE    0E6BH     0095H     UNIT         ?PR?CLEAR_FEATURE?USBLIB
N           CODE    0EEBH     009AH     UNIT         ?PR?CLEAR_FEATURE?USBLIB

            CODE    0F00H     0095H     UNIT         ?PR?SET_FEATURE?USBLIB
N           CODE    0F85H     009AH     UNIT         ?PR?SET_FEATURE?USBLIB

  • 0 in reply to Grant B
    Grant B said:
    I wonder if some optimization is getting ignored or something.

    That would be the kind of thing I'd be looking at.

    Maybe the definitions of the optimisations have changed, or some other default has changed ...