[Tinycc-devel] TCC 0.9.28rc testing: dte

[Detlef Riekenberg]

Results for testing 0.9.28rc with the project
https://github.com/craigbarnes/dte

* build break
  -> fixed in mob

* 128 warnings: assignment from incompatible pointer type
   -> that's ok. The project source has macros to disable these warnings
      for gcc and clang

* 1 warning: function might return no value: 'xvasprintf'
  -> In the project source is a function call ("fatal_error") which is declared 
as "noreturn"
     tcc is not smart enough to detect, that the end of the function will never 
be reached.

* All tests are passed with "make check", but with tcc, fewer tests are run
  gcc/clang: 30271, tcc: 30247.
  (the 32bit numbers differ, and my system is missing a 32bit library)

* compile time comparsion (1x warmup, 5x time collected) with "gcc -O0" and 
clang -O0
  (always after a "make clean").
  Machine is a laptop with linux (i7 2620M: 2 core, 4 thread)

make (tcc):
1.10user 0.67system 0:00.57elapsed 310%CPU
1.13user 0.66system 0:00.58elapsed 306%CPU
1.13user 0.68system 0:00.58elapsed 309%CPU
1.06user 0.69system 0:00.57elapsed 307%CPU
1.07user 0.70system 0:00.57elapsed 309%CPU
average: 0,574

make (gcc 12.3.0):
25.95user 3.06system 0:07.85elapsed 369%CPU
25.79user 3.24system 0:07.94elapsed 365%CPU
26.04user 2.98system 0:07.97elapsed 363%CPU
26.02user 3.00system 0:08.13elapsed 356%CPU
26.02user 3.07system 0:07.96elapsed 365%CPU
average: 7,97
tcc is ~14 times faster


make (clang 15.0.7)
25.58user 4.38system 0:08.64elapsed 346%CPU
25.64user 4.50system 0:08.44elapsed 356%CPU
25.77user 4.37system 0:08.60elapsed 350%CPU
25.45user 4.57system 0:08.75elapsed 342%CPU
25.77user 4.36system 0:08.40elapsed 358%CPU
average: 8,566
tcc is ~15 times faster


For comparsion, a quick check without parallel jobs:

make -j1 check:
tcc    1.06user 0.65system 0:01.71elapsed 100%CPU
gcc   20.01user 2.88system 0:22.90elapsed 100%CPU
clang 17.93user 3.84system 0:21.77elapsed 100%CPU


make -j1:
tcc    0.85user 0.46system 0:01.31elapsed 100%CPU
gcc   15.17user 2.38system 0:17.55elapsed 100%CPU
clang 14.34user 3.08system 0:17.43elapsed 99%CPU

tcc is still >10 times faster, when using no paralell make jobs



--
Bye bye ... Detlef