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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/49969] New: not vectorized: data ref analysis failed Date: Wed, 03 Aug 2011 17:24:00 -0000 [thread overview] Message-ID: <bug-49969-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49969 Summary: not vectorized: data ref analysis failed Product: gcc Version: 4.7.0 Status: UNCONFIRMED Keywords: missed-optimization Severity: normal Priority: P3 Component: middle-end AssignedTo: unassigned@gcc.gnu.org ReportedBy: burnus@gcc.gnu.org CC: irar@gcc.gnu.org, rguenther@suse.de The following program does not vectorize. With Intel's ifort one gets the message: PERMUTED LOOP WAS VECTORIZED while GCC just prints: test.f90:6: note: not vectorized: data ref analysis failed D.1566_33 = *iz_32(D)[D.1565_31]; test.f90:7: note: not vectorized: data ref analysis failed D.1566_33 = *iz_32(D)[D.1565_31]; test.f90:2: note: vectorized 0 loops in function. In case of GCC, it does not depend on the loop order - permuting does not change anything. Also it is independent of the patch to PR 49957. ! From Polyhedron's ac.f90, line 746 SUBROUTINE SUSCEP(L,Iz,Dsus) INTEGER L , Iz(L,L) , iznum DOUBLE PRECISION Dsus iznum = 0 DO iy = 1 , L DO ix = 1 , L iznum = iznum + Iz(iy,ix) ENDDO ENDDO Dsus = DBLE(iznum) Dsus = Dsus*Dsus Dsus = Dsus/(L*L) END
next reply other threads:[~2011-08-03 17:24 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-08-03 17:24 burnus at gcc dot gnu.org [this message] 2011-08-04 9:45 ` [Bug middle-end/49969] " rguenth at gcc dot gnu.org 2012-07-13 8:35 ` rguenth at gcc dot gnu.org
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