This is the source code for an old program I made - the LibraryTimer -
which is able to measure time-usage of library functions.
The archive with the binary can be found in dev/misc.

The source lacks a few macros, so you would probably have to hack your
way through the assembly. Good luck :)

-- Jesper (14.06.97)

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
drwxrwxr-x  2036/2036        0       0 ****** -lhd- 0000 Jun 14  1997 LibraryTimerSrc/
-rw-rw-r--  2036/2036     2937   14852  19.8% -lh5- fcb1 Jun 14  1997 LibraryTimerSrc/LibraryTimerGui.s
-rw-rw-r--  2036/2036      297     481  61.7% -lh5- 0f4b Jun 14  1997 LibraryTimerSrc/libtimer.readme
-rw-rw-r--  2036/2036     6633   21564  30.8% -lh5- c6fb Jun 14  1997 LibraryTimerSrc/libtimer054.S
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         4 files    9867   36897  26.7%            Jun 15  1997