c++ - Can I get a log of optimizations applied by the compiler? -


this question has answer here:

when compiling c++ application or library optimizations turned on, -o3 gcc, there way applied optimizations listed? mean, without comparing actual byte code. interesting learn.

from

http://gcc.gnu.org/onlinedocs/gcc/debugging-options.html

the -fopt-info family of switches causes optimizer dump out information stderr (or file if prefer). in particular, -fopt-info-missed can useful see why optimisation could not applied.

there quite few different combinations available. linked page:

for example,

          gcc -o3 -fopt-info-missed=missed.all

outputs missed optimization report passes missed.all.

as example,

  gcc -o3 -fopt-info-inline-optimized-missed=inline.txt

will output information missed optimizations optimized locations inlining passes inline.txt.


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