https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72712
Bug ID: 72712
Summary: Tenfold compile time regression
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: jamborm at gcc dot gnu.org
CC: law at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-linux
Target: x86_64-linux
Created attachment 39025
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39025&action=edit
Testcase
Since revision r236831, the -O2 compilation time of the attached
testcase went from 17 seconds to 250 seconds on my desktop (-O3 went
from 19 to 284). Just compile with
~/gcc/bisect/inst/bin/gfortran -c -o o2.o -O2 pr.f90
to see for yourself.
I have extracted the testcase from a benchmark which has a number of
similar functions and I was never patient enough to wait for it to
finish compilation (the script running the suite always kills
compilation as running too long too).
