diff options
Diffstat (limited to 'gcc/fortran/invoke.texi')
| -rw-r--r-- | gcc/fortran/invoke.texi | 28 |
1 files changed, 23 insertions, 5 deletions
diff --git a/gcc/fortran/invoke.texi b/gcc/fortran/invoke.texi index da085d1..a65f2d1 100644 --- a/gcc/fortran/invoke.texi +++ b/gcc/fortran/invoke.texi @@ -189,7 +189,7 @@ and warnings}. -fbounds-check -ftail-call-workaround -ftail-call-workaround=@var{n} -fcheck-array-temporaries -fcheck=<all|array-temps|bits|bounds|do|mem|pointer|recursion> --fcoarray=<none|single|lib> -fexternal-blas -ff2c +-fcoarray=<none|single|lib> -fexternal-blas -fexternal-blas64 -ff2c -ffrontend-loop-interchange -ffrontend-optimize -finit-character=@var{n} -finit-integer=@var{n} -finit-local-zero -finit-derived -finit-logical=<true|false> @@ -1170,6 +1170,10 @@ A @code{CHARACTER} variable is declared with negative length. With @option{-fopenmp}, for fixed-form source code, when an @code{omx} vendor-extension sentinel is encountered. (The equivalent @code{ompx}, used in free-form source code, is diagnosed by default.) + +@item +With @option{-fopenacc}, when using named constances with clauses that +take a variable as doing so has no effect. @end itemize @opindex Wtabs @@ -2010,13 +2014,27 @@ for some matrix operations like @code{MATMUL}, instead of using our own algorithms, if the size of the matrices involved is larger than a given limit (see @option{-fblas-matmul-limit}). This may be profitable if an optimized vendor BLAS library is available. The BLAS library has -to be specified at link time. +to be specified at link time. This option specifies a BLAS library +with integer arguments of default kind (32 bits). It cannot be used +together with @option{-fexternal-blas64}. + +@opindex fexternal-blas64 +@item -fexternal-blas64 +makes @command{gfortran} generate calls to BLAS functions +for some matrix operations like @code{MATMUL}, instead of using our own +algorithms, if the size of the matrices involved is larger than a given +limit (see @option{-fblas-matmul-limit}). This may be profitable if an +optimized vendor BLAS library is available. The BLAS library has +to be specified at link time. This option specifies a BLAS library +with integer arguments of @code{KIND=8} (64 bits). It cannot be used +together with @option{-fexternal-blas}, and requires a 64-bit system. +This option also requires @option{-ffrontend-optimize}. @opindex fblas-matmul-limit @item -fblas-matmul-limit=@var{n} -Only significant when @option{-fexternal-blas} is in effect. -Matrix multiplication of matrices with size larger than (or equal to) @var{n} -is performed by calls to BLAS functions, while others are +Only significant when @option{-fexternal-blas} or @option{-fexternal-blas64} +are in effect. Matrix multiplication of matrices with size larger than or equal +to @var{n} is performed by calls to BLAS functions, while others are handled by @command{gfortran} internal algorithms. If the matrices involved are not square, the size comparison is performed using the geometric mean of the dimensions of the argument and result matrices. |