http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50770
Bug #: 50770
Summary: limits-fndefn.c times out on ARM; runs 22 x faster
with -fno-var-tracking
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: [email protected]
ReportedBy: [email protected]
On a Cortex-A9 with recent trunk:
cbuild@tcpanda01:~$ time
./gcc-4.7~svn179959-armv7l-natty-cbuild199-tcpanda06-cortexa9r1/bin/gcc -O3 -g
-c limits-fndefn.c
real 17m44.543s
user 7m7.477s
sys 10m33.117s
Adding -fno-var-tracking gives:
cbuild@tcpanda01:~$ time
./gcc-4.7~svn179959-armv7l-natty-cbuild199-tcpanda06-cortexa9r1/bin/gcc -O3 -g
-fno-var-tracking -c limits-fndefn.c
real 0m31.788s
user 0m30.398s
sys 0m0.937s
The times are similar on the 4.6 branch.
This isn't causing problems, but suggests that the var tracking code could be
improved.
