Why the result depends on -g option and type of function
Just a small program. REAL(8) FUNCTION DUMMY(i) implicit none integer, intent(in) :: i DUMMY=dble(i) write(*,*) 'i=', dble(i),'res=',DUMMY RETURN END FUNCTION program test real(8) :: xxx xxx=DUMMY(2)...
View ArticleMPICH2-1.5 Install problem - help!
I am trying to install mpich2-1.5 on my linux system (RHEL 6.5) but I can'tThe configure failed showingconfigure error: ***** Incompatible Fortran and C Object File Types! *****F77 object file type...
View Articleifort 14.0.2 bug prevents scipy tests to pass
I've tried to use Intel MKL with numpy 1.8.0 and scipy 0.13.3 python packages.When I use -O2 option for ifort scipy tests in scipy.odr subpackage fails everytime.Using -O1 instead of -O2 results in...
View ArticleHelp with Fortran Wrapper that Interfaces with C Library
Dear Fortran Gurus,Let me begin with a disclaimer. I'm not a Fortran developer, but a library that I've written has been adopted by some parallel scientific codes written in Fortran, so I thought I...
View ArticleRedistributable files for Mac OS X and Linux
Hi there,I have been using Intel's Fortran compiler for Windows for a while. The binary produced by the compiler with options OpenMP and MPI needs to be redistributed with several dynamic link...
View ArticleOptimization causes array index out of bounds
I'm still testing the ffte benchmark. Running it on the host with -O3 -xAVX -openmp works flawlessly and the performance looks great. Now I wanted to use that code on the Intel Xeon Phi. So I replaced...
View ArticleRecursive function and pass by VALUE optimizations
Hi all,I have some questions about the recursive functions performance in the compiler.The code is below, the performance table obtains with the compiler 14. First column is normal, second column is...
View Article-openmp results in easier vectorization?
Hi, I had an interesting finding when I played with the following OpenMP code: !$OMP PARALLEL SHARED(vals, N2, N1g, dF, F) PRIVATE(value, ind_offset, l0) !$OMP DO do k = ks, ke do ii = iis, iie value =...
View ArticleICE with -standard-semantics
Hi all, I see and ICE when compiling the following code with -standard-semantics :$ ifort -standard-semantics -c ice.f90 010101_13220 catastrophic error: **Internal compiler error: internal...
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how to call functions in the MKL_lapack95 library
Hi, I need your help about using the MKL_lapack95 library: I need to call a subroutine ("polyfit.f") which calls two functions in the MKL_lapack95 library. I am using intel fortran...
View ArticleIndex offset leads to failure of vectorizing simple loops
Hi, I have a quick question (maybe a compiler bug?) regarding vectorization. I am playing with the following code piece:Declaration of variables: 1415 real(kind=8), allocatable :: F(:), dF(:) 1416...
View ArticleSuperfluous GENERIC OPERATOR specification in extended derived type generated...
Dear Steve et al. at Intel,Can you please review the code shown below and check whether it is ok to have a superfluous GENERIC OPERATOR specification in an extended derived type that is simply a copy...
View ArticleOverride default component initialization
Hi,I understand the following is not legal: module foo type :: bar integer :: a=53 end type type, extends(bar) :: rab integer :: a=-33333 !!! Redefine default initialization end type end moduleI think...
View ArticleFunctions returning arrays, derived types and the creation of temporaries.
Dear all,Consider the following situation followed up by a working test case.Let there be a derived type wrapping a multidimensional array. Let there further be a function "sum" which adds array...
View ArticleCompiler not detecting missing OMP4 declare target variable
Most of the time, the compiler will complain if a global variable used in an OMP4 target region is not declared for the target (!$omp declare targt(foo))But now I had a (very big) program that compiled...
View ArticleBad performance with bitwise operations
Hello, I noticed this is noticably slower with ifort 14.0.0 than with gfortran. Is there anything to make the result run faster? use iso_fortran_env real(real32) :: x32 integer(int64) :: t1, t2, trate...
View ArticleCoarray type with an allocatable component of length zero
I get a SIGSEGV when running the following code type t real, allocatable :: a(:) end type t type(t) :: data[*] allocate(data%a(0)) print*, size(data[1]%a) end program If, instead of the last line...
View ArticleDistributable binary for Mac OS X
Hi there,I am using the latest Intel fortran composer on Mac OS X (10.9.2) to compile my code, with commandifort -O1 -ip *.f90The binary generated, a.out, works fine on my Mac. However, when my...
View ArticleFixing multiplicity of common blocks in library
Can identical common blocks of mutually exclusive subroutines be merged within a library? Current results show multiplicity. I modified a Fortran 77 package to use common blocks in lieu of internally...
View ArticlePuzzle: changing the order of outer loops leads to significant performance...
Hi, I have a puzzling finding that changing the order of the outer loops led to significant performance increase. I am playing with the following two versions of a small code piece:Version 1: ii, k, j,...
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