Re: GNAT (GCC) Profile Guided Compilation

[Keean Schupke <keean.schupke@googlemail.com>]

On Thursday, 19 July 2012 06:42:05 UTC+1, Georg Bauhaus  wrote:
> On 18.07.12 19:36, Keean Schupke wrote:
> > I think if you use -O3 -gnatn (and pragma Inline(X)) the function will be inlined. Does it still make a difference then?
> 
> It did. In particular, A_T_A_Conversion seemed to need -gnatN.
> The differences were small, in a range between .67s and .73s
> for 50_000_000 iterations, trying a number of combinations of
> switches. I haven't tried profile guided optimization, though.

Here's my makefile if its useful:


test: test.adb
    rm -f *.gcda
    gnatmake -march=native -O3 -fprofile-generate -ftest-coverage -gnatp -gnatn test -bargs -shared -cargs -fdata-sections -ffunction-sections -largs -Wl,--gc-sections
    ./test
    touch test.adb
    gnatmake -march=native -O3 -fprofile-use -gnatp -gnatn test -bargs -shared -cargs -fdata-sections -ffunction-sections -largs -Wl,--gc-sections


Cheers,
Keean.