LX51: Linker Code Packing

Information in this article applies to:

• C51 Version 7.01 and later

The PK51 Professional Developer's Kit includes a new optimization (Linker Code Packing) which is implemented in the LX51 Linker.

Linker Code Packing organizes the segments in your application and re-codes LJMP and LCALL instructions as AJMP and ACALL wherever possible. This optimization reduces total program size by 3-8%.

The map file produced by the LX51 Linker has a .MAP extension instead of the .M51 extension which was produced by the BL51 Linker.

In µVision, enable this optimization in Options for Target - CX51: Code Optimization: Linker Code Packing.

Note that this new optimization is only available in the PK51 Professional Developer's Kit V6.23 and higher. This optimization is performed by the LX51 Linker and is not available with the BL51 Linker.

MORE INFORMATION

• Refer to NOAJMP in the LX51 User's Guide.
• Refer to Keil Cx51 Compiler in the µVision User's Guide.
• Refer to OBJECTADVANCED in the Cx51 User's Guide.
• Refer to Optimizer Options in the Cx51 User's Guide.
• Refer to Code Packing in the LX51 User's Guide.

SEE ALSO

• LX51: CODE PACKING PROBLEM WITH C51 V7.50
• LX51: Linker Freezes When Performing Code Packing
• C51: Program-wide Source/Assembly Listing File

Last Reviewed: Thursday, February 25, 2021