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From: "sje at cup dot hp dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug fortran/31832] FAIL: gfortran.dg/integer_exponentiation_2.f90 at -O1 and above Date: Thu, 07 Jun 2007 22:47:00 -0000 [thread overview] Message-ID: <20070607224738.25417.qmail@sourceware.org> (raw) In-Reply-To: <bug-31832-276@http.gcc.gnu.org/bugzilla/> ------- Comment #1 from sje at cup dot hp dot com 2007-06-07 22:47 ------- I have looked into this bug and I think it is an HP math lib bug. The 64 bit powf function is using %fr12R but not saving/restoring it the way it is supposed to. I have a query in to the math lib folks to see if they can verify my finding. Here is a smaller test case that prints different values at -O1 or -O2 than at -O0. program test real a call run_me (-1.1, -1) a = -1.1 end program test subroutine run_me(a, i) implicit none real, intent(in) :: a integer, intent(in) :: i print *, a**-2.0 print *, (1/a)*(1/a) call check_equal_r (a**-2.0, (1/a)*(1/a)) end subroutine run_me subroutine check_equal_r (a, b) real, intent(in) :: a, b print *, a print *, b end subroutine check_equal_r -- sje at cup dot hp dot com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |sje at cup dot hp dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31832
next prev parent reply other threads:[~2007-06-07 22:47 UTC|newest] Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top 2007-05-05 1:21 [Bug fortran/31832] New: " danglin at gcc dot gnu dot org 2007-06-07 22:47 ` sje at cup dot hp dot com [this message] 2007-07-06 8:45 ` [Bug fortran/31832] " dfranke at gcc dot gnu dot org 2007-07-07 15:10 ` danglin at gcc dot gnu dot org 2007-08-08 17:29 ` fxcoudert at gcc dot gnu dot org 2007-08-08 17:30 ` fxcoudert at gcc dot gnu dot org 2007-08-09 21:55 ` fxcoudert at gcc dot gnu dot org 2007-08-09 23:30 ` dave at hiauly1 dot hia dot nrc dot ca 2007-10-05 13:02 ` fxcoudert at gcc dot gnu dot org 2007-12-08 18:07 ` fxcoudert at gcc dot gnu dot org 2008-12-27 17:34 ` danglin at gcc dot gnu dot org 2008-12-28 16:23 ` danglin at gcc dot gnu dot org 2008-12-29 20:12 ` danglin at gcc dot gnu dot org 2008-12-31 15:44 ` danglin at gcc dot gnu dot org 2008-12-31 15:45 ` danglin at gcc dot gnu dot org
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