[Bug fortran/106565] Using a transposed matrix in matmul (GCC-10.3.0) is very slow

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106565 --- Comment #2 from Quanhua Liu --- I modified the application code (see below) and use the "method" as a control variable from command line. I use the same code for both gfortran 10.3.0 and ifort 19.0.5.281 gfortran -O3 matrixCal.f90 time

[Bug fortran/106565] Using a transposed matrix in matmul (GCC-10.3.0) is very slow

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106565 --- Comment #5 from Quanhua Liu --- Hi Richard, Using -fexternal-blas for gfortran v10.3.0 is much slower than the method 2:   BB = transpose(B)   C = matmul(A, BB) How about on your machine? Thanks, Quanhua Liu On 8/9/2022 11:07 AM,

[Bug fortran/106565] Using a transposed matrix in matmul (GCC-10.3.0) is very slow

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106565 --- Comment #4 from Quanhua Liu --- Using gfortran -O3 -fexternal-blas -L/. -lblas testmatrixCal.f90 time a.out 1 real: 6.14 (s) time a.out 2 real: 5.41 It is 6 times slower than BB = transpose(B) C = matmul(A, BB) ifort doesn't

[Bug fortran/106565] Using a transposed matrix in matmul (GCC-10.3.0) is very slow

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106565 --- Comment #9 from Quanhua Liu --- Hi Richard, It seems that I cannot add comment online to the ticket. I tried    gfortran -o z -O3 -march=native test_matrixCal.f90 -fexternal-blas -lblas -fdump-tree-optimized   time a.out 1   and   

[Bug fortran/106565] New: Using a transposed matrix in matmul (GCC-10.3.0) is very slow

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106565 Bug ID: 106565 Summary: Using a transposed matrix in matmul (GCC-10.3.0) is very slow Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal