http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49540
Summary: [4.6/4.7 Regression] Memory-hot with large DATA stmt
Product: gcc
Version: 4.6.1
Status: UNCONFIRMED
Keywords: memory-hog
Severity: normal
Priority: P3
Component: fortran
AssignedTo: [email protected]
ReportedBy: [email protected]
COMMON/A/B(100000,100)
DATA B/10000000*0.0/
END
used to compile in just a couple of MB of memory and fraction of a second, but
starting with
http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=159076
it needs over 5GB of RAM and very long time.
That is only small fragment from original real-world testcase, which contains:
PARAMETER (MAXSTR=150001)
c...
COMMON/HJJET2/NSG,NJSG(MAXSTR),IASG(MAXSTR,3),K1SG(MAXSTR,100),
& K2SG(MAXSTR,100),PXSG(MAXSTR,100),PYSG(MAXSTR,100),
& PZSG(MAXSTR,100),PESG(MAXSTR,100),PMSG(MAXSTR,100)
c...
DATA NSG/0/,NJSG/150001*0/,IASG/450003*0/,
& K1SG/15000100*0/,K2SG/15000100*0/,
& PXSG/15000100*0.0/,PYSG/15000100*0.0/,PZSG/15000100*0.0/,
& PESG/15000100*0.0/,PMSG/15000100*0.0/
c...
END
c...
which compiled just fine with gcc up to 4.5.x and with 4.6/4.7 it is basically
out of any hope to compile it.
