Liu Haibin wrote:
Hi,
I wanted to use bb->count, so I expected that -fprofile-arcs and
-fbranch-probabilities would help. I added printf just before
peephole2 optimization and ran the following.
$gcc -O3 -fprofile-arcs test.c -o test
$./test (which produced test.gcno only, but no test.gcda)
$gcc -O3 -fprofile-arcs -fbranch-probabilities test.c -o test
Easier to use -fprofile-generate and -fprofile-use:
gcc -O3 -fprofile-generate test.c -o test (produces test.gcno)
./test (now should have as well test.gcda)
gcc -O3 -fprofile-use test.c -o test
Paolo
