SLAU132V User guide | 德州仪器 TI.com.cn

SLAU132V October 2004 – February 2020

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3.7.1.3 Generating and Using Profile Information

There are two options that control feedback directed optimization:

--gen_profile_info

tells the compiler to add instrumentation code to collect profile information. When the program executes the run-time-support exit() function, the profile data is written to a PDAT file. This option applies to all the C/C++ source files being compiled on the command-line.

If the environment variable TI_PROFDATA on the host is set, the data is written into the specified file. Otherwise, it uses the default filename: pprofout.pdat. The full pathname of the PDAT file (including the directory name) can be specified using the TI_PROFDATA host environment variable.

By default, the RTS profile data output routine uses the C I/O mechanism to write data to the PDAT file. You can install a device handler for the PPHNDL device to re-direct the profile data to a custom device driver routine. For example, this could be used to send the profile data to a device that does not use a file system.

Feedback directed optimization requires you to turn on at least some debug information when using the --gen_profile_info option. This enables the compiler to output debug information that allows pdd430 to correlate compiled functions and their associated profile data.

--use_profile_info

specifies the profile information file(s) to use for performing phase 2 of feedback directed optimization. More than one profile information file can be specified on the command line; the compiler uses all input data from multiple information files. The syntax for the option is:

--use_profile_info==file1[, file2, ..., filen]

If no filename is specified, the compiler looks for a file named pprofout.prf in the directory where the compiler in invoked.