This is the home page of CALC_WCET_167
This page is about Worst-Case Execution Time (WCET) analysis.
TU-Vienna has developed a WCET analysis framework that allows to
analyze programs given as C source code (written in wcetC, a special
dialect developed for WCET analysis) and also as assembly code.
The tool was initially developed to analyze code for the C167CR
processor from Siemens (therefore comes the suffix "_167" in the name).
WCET analysis is an active and interesting research topic inside the
domain of real-time computing.
To have an impression, how the WCET analysis tool works,
please browse the publications of
There is also some documentation about the WCET analysis tool itself
- Introduction into the programming language wcetC (pdf)
- Overview about the usage of calc_wcet_167 (pdf)
This tool is still under development.
But if you want to see the concepts of the tool, you can
download a preliminary test version.
This tool is not restricted in usage, except that it has
some built-in limitations:
The back-end of the compiler and the WCET calculation tool are
currently only targeted to the C167CR processor from Siemens
(there exist also an older implementation for the M68000 from
But we plan to extend the tool also to other interesting hardware
But again, the tool is still in development, there have to be
also done some work inside the compiler to enhance support of
- A maximum of 200 assembly instructions
can be analyzed.
- The calculated WCET result must be smaller
than 5.000.000 CPU cycles
Sorry, but we can't provide support for this preliminary version of the
And also, the use of this tool is at your own risk, we do not guarantee
anything about the results you may obtain with them (though the
tool was tested thoroughly at our department).
But you are welcome to send the author comments about your experience with the tool.
r.kirner (@) herts.ac.uk,
last modification: Feb. 25th, 2014.