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[Bug fortran/78611] -march=native makes code 3x slower
- From: "pepalogik at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 30 Nov 2016 12:09:22 +0000
- Subject: [Bug fortran/78611] -march=native makes code 3x slower
- Auto-submitted: auto-generated
- References: <bug-78611-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78611
--- Comment #1 from Jan Lachnitt <pepalogik at seznam dot cz> ---
Created attachment 40200
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40200&action=edit
Smaller test case
Here is a smaller test case, which runs for a second only, not hours.
without -march=native:
real 0m0.610s
user 0m0.560s
sys 0m0.000s
with -march=native:
real 0m1.271s
user 0m1.268s
sys 0m0.000s