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Re: [patch, fortran] Reduce stack use in blocked matmul
- From: Andreas Schwab <schwab at suse dot de>
- To: Thomas Koenig <tkoenig at netcologne dot de>
- Cc: "fortran\@gcc.gnu.org" <fortran at gcc dot gnu dot org>, gcc-patches <gcc-patches at gcc dot gnu dot org>
- Date: Tue, 09 May 2017 12:43:24 +0200
- Subject: Re: [patch, fortran] Reduce stack use in blocked matmul
- Authentication-results: sourceware.org; auth=none
- References: <2f81b4a0-79b7-1366-56f3-7355bb9f264a@netcologne.de>
On Mai 05 2017, Thomas Koenig <tkoenig@netcologne.de> wrote:
> @@ -227,6 +226,17 @@ sinclude(`matmul_asm_'rtype_code`.m4')dnl
> if (m == 0 || n == 0 || k == 0)
> return;
>
> + /* Adjust size of t1 to what is needed. */
> + index_type t1_dim;
> + t1_dim = (a_dim1-1) * 256 + b_dim1;
> + if (t1_dim > 65536)
> + t1_dim = 65536;
What happens if (a_dim1-1) * 256 + b_dim1 > 65536?
Andreas.
--
Andreas Schwab, SUSE Labs, schwab@suse.de
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