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* [Bug fortran/22572] New: Double occurrence of matmul intrinsic not optimised @ 2005-07-20 17:50 schnetter at aei dot mpg dot de 2005-07-20 17:54 ` [Bug fortran/22572] " schnetter at aei dot mpg dot de ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: schnetter at aei dot mpg dot de @ 2005-07-20 17:50 UTC (permalink / raw) To: gcc-bugs GNU Fortran 95 (GCC 4.1.0 20050715 (experimental)), when run with the options -Wall -O3 -march=pentium4 -S, optimises one of the two calls to the sin intrinsic away in the following function: function optsin (x) implicit none double precision :: optsin double precision, intent(in) :: x optsin = sin(x) / (1 + sin(x)) end function optsin In the "equivalent" function function optmatmul (a, b, ni, nj) implicit none integer, intent(in) :: ni, nj double precision :: optmatmul(ni, nj) double precision, intent(in) :: a(ni, nj), b(ni, nj) optmatmul = matmul(a, b) / (1 + matmul(a, b)) end function optmatmul the two calls to matmul both remain present in the assembler output, although they are known to return the same result. -- Summary: Double occurrence of matmul intrinsic not optimised Product: gcc Version: 4.1.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: fortran AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: schnetter at aei dot mpg dot de CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: i686-pc-linux-gnu GCC host triplet: i686-pc-linux-gnu GCC target triplet: i686-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22572 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug fortran/22572] Double occurrence of matmul intrinsic not optimised 2005-07-20 17:50 [Bug fortran/22572] New: Double occurrence of matmul intrinsic not optimised schnetter at aei dot mpg dot de @ 2005-07-20 17:54 ` schnetter at aei dot mpg dot de 2005-07-20 18:02 ` pinskia at gcc dot gnu dot org 2005-07-21 5:12 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: schnetter at aei dot mpg dot de @ 2005-07-20 17:54 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Severity|normal |enhancement http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22572 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug fortran/22572] Double occurrence of matmul intrinsic not optimised 2005-07-20 17:50 [Bug fortran/22572] New: Double occurrence of matmul intrinsic not optimised schnetter at aei dot mpg dot de 2005-07-20 17:54 ` [Bug fortran/22572] " schnetter at aei dot mpg dot de @ 2005-07-20 18:02 ` pinskia at gcc dot gnu dot org 2005-07-21 5:12 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-07-20 18:02 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Keywords| |missed-optimization http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22572 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug fortran/22572] Double occurrence of matmul intrinsic not optimised 2005-07-20 17:50 [Bug fortran/22572] New: Double occurrence of matmul intrinsic not optimised schnetter at aei dot mpg dot de 2005-07-20 17:54 ` [Bug fortran/22572] " schnetter at aei dot mpg dot de 2005-07-20 18:02 ` pinskia at gcc dot gnu dot org @ 2005-07-21 5:12 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-07-21 5:12 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-07-21 05:08 ------- Confirmed. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 Last reconfirmed|0000-00-00 00:00:00 |2005-07-21 05:08:29 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22572 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-07-21 5:08 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-07-20 17:50 [Bug fortran/22572] New: Double occurrence of matmul intrinsic not optimised schnetter at aei dot mpg dot de 2005-07-20 17:54 ` [Bug fortran/22572] " schnetter at aei dot mpg dot de 2005-07-20 18:02 ` pinskia at gcc dot gnu dot org 2005-07-21 5:12 ` pinskia at gcc dot gnu dot org
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