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From: "john.harper at vuw dot ac.nz" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug fortran/57871] New: gfortran -freal-4-real-16 gives wrong result for selected_real_kind(1) Date: Tue, 09 Jul 2013 23:38:00 -0000 [thread overview] Message-ID: <bug-57871-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57871 Bug ID: 57871 Summary: gfortran -freal-4-real-16 gives wrong result for selected_real_kind(1) Product: gcc Version: 4.8.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran Assignee: unassigned at gcc dot gnu.org Reporter: john.harper at vuw dot ac.nz gfortran 4.8.1 -freal-4-real-16 gives real(16) kind with selected_real_kind(1) but it ought to give real(8) because that is the smallest decimal precision available with that compiler option. Same problem with -freal-4-real-10 giving real(10) instead of real(8). Evidence: cayley[~/Jfh] % cat testprecision.f90 implicit none integer,parameter:: p1 = selected_real_kind(1), dp = kind(1d0) print *,'kind(1.0_p1)',kind(1.0_p1),'precision(1.0_p1)',precision(1.0_p1) print *,'kind(1.0_dp)',kind(1.0_dp),'precision(1.0_dp)',precision(1.0_dp) end cayley[~/Jfh] % /local/scratch/gf/bin/gfortran -freal-4-real-16 -Wall -Wextra -fno-strict-aliasing -fwrapv testprecision.f90 cayley[~/Jfh] % ./a.out kind(1.0_p1) 16 precision(1.0_p1) 33 kind(1.0_dp) 8 precision(1.0_dp) 15 cayley[~/Jfh] % /local/scratch/gf/bin/gfortran -freal-4-real-10 -Wall -Wextra -fno-strict-aliasing -fwrapv testprecision.f90 cayley[~/Jfh] % ./a.out kind(1.0_p1) 10 precision(1.0_p1) 18 kind(1.0_dp) 8 precision(1.0_dp) 15 cayley[~/Jfh] % /local/scratch/gf/bin/gfortran -v Using built-in specs. COLLECT_GCC=/local/scratch/gf/bin/gfortran COLLECT_LTO_WRAPPER=/local/scratch/gf/libexec/gcc/x86_64-unknown-linux-gnu/4.8.1/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: /local/scratch/gcc-4.8-20130530/configure --prefix=/local/scratch/gf --enable-languages=c,fortran --disable-libada --with-local-prefix=/local/scratch --with-gmp=/local/scratch Thread model: posix gcc version 4.8.1 20130530 (prerelease) (GCC) cayley[~/Jfh] %
next reply other threads:[~2013-07-09 23:38 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-07-09 23:38 john.harper at vuw dot ac.nz [this message] 2013-07-10 13:07 ` [Bug fortran/57871] " dominiq at lps dot ens.fr 2013-07-10 17:42 ` kargl at gcc dot gnu.org 2013-07-10 20:02 ` sgk at troutmask dot apl.washington.edu 2013-07-10 21:31 ` harper at msor dot vuw.ac.nz 2013-07-11 22:30 ` harper at msor dot vuw.ac.nz 2013-07-11 22:51 ` sgk at troutmask dot apl.washington.edu 2013-11-25 0:59 ` kargl at gcc dot gnu.org 2021-03-04 11:59 ` dominiq at lps dot ens.fr 2021-03-05 9:43 ` cvs-commit at gcc dot gnu.org 2021-03-05 9:53 ` burnus at gcc dot gnu.org 2021-03-07 13:19 ` dominiq at lps dot ens.fr
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