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From: "vbyakovl23 at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/53616] [4.8 Regression] 416.gamess in SPEC CPU 2006 miscompiled Date: Mon, 23 Jul 2012 12:54:00 -0000 [thread overview] Message-ID: <bug-53616-4-2Ou95EnrQU@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-53616-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53616 Vladimir Yakovlev <vbyakovl23 at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |vbyakovl23 at gmail dot com --- Comment #11 from Vladimir Yakovlev <vbyakovl23 at gmail dot com> 2012-07-23 12:53:13 UTC --- Miscompare in 416 .games is caused by a wrong transformation of a loop in file grd2b.f, lines 113-121. DO 110 M=1,3 P12(M,1)= C(M,IAT) P12(M,2)= C(M,JAT) P12(M,3)= P12(M,2)-P12(M,1) R12= R12+P12(M,3)*P12(M,3) P34(M,1)= C(M,KAT) P34(M,2)= C(M,LAT) P34(M,3)= P34(M,2)-P34(M,1) 110 R34= R34+P34(M,3)*P34(M,3) After transformation we have P12(:,1) = C(:,IAT) P12(:,2) = C(:,jAT) DO 110 M=1,3 P12(M,3)= P12(M,2)-P12(M,1) R12= R12+P12(M,3)*P12(M,3) P34(M,3)= P34(M,2)-P34(M,1) 110 R34= R34+P34(M,3)*P34(M,3) P34(:,1) = C(:,KAT) P34(:,2) = C(:,LAT) That is we changed order of operators in the loop. Right transformation should be P12(:,1) = C(:,IAT) P12(:,2) = C(:,jAT) DO 110 M=1,3 P12(M,3)= P12(M,2)-P12(M,1) 110 R12= R12+P12(M,3)*P12(M,3) P34(:,1) = C(:,KAT) P34(:,2) = C(:,LAT) DO 111 M=1,3 P34(M,3)= P34(M,2)-P34(M,1) 111 R34= R34+P34(M,3)*P34(M,3) I attached a reduced test case and dumps with and without transformations. Command line to compile is gfortran m.f t.f -O3 The result of run is differed from a result of code compiled with -O0 opt level. I used compiler Target: x86_64-unknown-linux-gnu Configured with: ../gcc/configure --with-arch=corei7 --with-cpu=corei7 --enable-clocale=gnu --with-system-zlib --enable-shared --with-demangler-in-ld --enable-cloog-backend=isl --with-fpmath=sse --enable-languages=c,c++,fortran --enable-bootstrap=no Thread model: posix gcc version 4.8.0 20120606 (experimental) (GCC)
next prev parent reply other threads:[~2012-07-23 12:54 UTC|newest] Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-06-08 17:19 [Bug middle-end/53616] New: " hjl.tools at gmail dot com 2012-06-08 22:15 ` [Bug middle-end/53616] " hjl.tools at gmail dot com 2012-06-11 9:48 ` rguenth at gcc dot gnu.org 2012-06-11 13:59 ` rguenth at gcc dot gnu.org 2012-06-12 12:30 ` rguenth at gcc dot gnu.org 2012-06-12 13:04 ` hjl.tools at gmail dot com 2012-06-12 13:07 ` hjl.tools at gmail dot com 2012-06-12 14:06 ` rguenth at gcc dot gnu.org 2012-06-14 13:02 ` rguenth at gcc dot gnu.org 2012-06-27 19:13 ` pthaugen at gcc dot gnu.org 2012-06-28 8:27 ` rguenther at suse dot de 2012-07-23 12:50 ` vbyakovl23 at gmail dot com 2012-07-23 12:54 ` vbyakovl23 at gmail dot com [this message] 2012-07-23 13:30 ` rguenth at gcc dot gnu.org 2012-07-24 8:39 ` rguenth at gcc dot gnu.org 2012-07-24 9:06 ` rguenth at gcc dot gnu.org 2012-07-24 15:37 ` vbyakovl23 at gmail dot com
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