The Polyhedron 2005 benchmark air.f90 is miscompiled when -O1/-O2/-O3
-fgraphite-identity -floop-interchange is used such that the program
outputs...
AIRFLOW IN A BOX
Version 2.0
(c) Hanley Innovations 1995
1.00000000000000002E-002 0.29999999999999999 10.000000000000000
0.10000000000000001 0
272.76999999999998 272.76999999999998 272.76999999999998
272.76999999999998 0.0000000000000000
11 12
X-DATA
1 0.0000000000000000 0.10000000000000001 4
2 5.00000000000000028E-002 0.22000000000000000 4
3 0.10000000000000001 0.29999999999999999 4
4 0.20000000000000001 0.40000000000000002 4
5 0.29999999999999999 0.50000000000000000 4
6 0.40000000000000002 0.59999999999999998 4
7 0.50000000000000000 0.69999999999999996 4
8 0.59999999999999998 0.80000000000000004 4
9 0.69999999999999996 0.90000000000000002 4
10 0.80000000000000004 0.96999999999999997 4
11 0.90000000000000002 1.0000000000000000 4
Y-DATA
0.0000000000000000 0.10000000000000001 4
4.00000000000000008E-002 0.14999999999999999 4
8.00000000000000017E-002 0.20000000000000001 4
0.14999999999999999 0.29999999999999999 4
0.20000000000000001 0.40000000000000002 4
0.29999999999999999 0.50000000000000000 4
0.40000000000000002 0.59999999999999998 4
0.50000000000000000 0.69999999999999996 4
0.59999999999999998 0.80000000000000004 4
0.69999999999999996 0.89000000000000001 4
0.80000000000000004 0.94999999999999996 4
0.94999999999999996 1.0000000000000000 4
ITERATION# TIME FINAL MASS RESIDUAL
14 100.000043187820 0.01000000 NaN
deltat, final t, iterations
100.00000000000000 100.00004318782042 14
14 NaN
when executed. This is seen with r150709 with the compiler specs of...
Target: x86_64-apple-darwin10
Configured with: ../gcc-4.5-20090812/configure --prefix=/sw
--prefix=/sw/lib/gcc4.5 --mandir=/sw/share/man --infodir=/sw/share/info
--enable-languages=c,c++,fortran,objc,java --with-gmp=/sw
--with-libiconv-prefix=/sw --with-ppl=/sw --with-cloog=/sw --with-system-zlib
--x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib
--disable-libjava-multilib --build=x86_64-apple-darwin10
--host=x86_64-apple-darwin10 --target=x86_64-apple-darwin10
Thread model: posix
gcc version 4.5.0 20090812 (experimental) (GCC)
--
Summary: -O1/-O2/-O3 -fgraphite-identity -floop-interchange
miscompiles air.f90
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: howarth at nitro dot med dot uc dot edu
GCC build triplet: x86_64-apple-darwin10
GCC host triplet: x86_64-apple-darwin10
GCC target triplet: x86_64-apple-darwin10
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41051
