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[Bug rtl-optimization/78634] [7 Regression] 30% performance drop after r242832.
- From: "vogt at linux dot vnet.ibm.com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 06 Feb 2017 13:55:15 +0000
- Subject: [Bug rtl-optimization/78634] [7 Regression] 30% performance drop after r242832.
- Auto-submitted: auto-generated
- References: <bug-78634-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78634
--- Comment #6 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
It fails with -march=zEC12 but not with -march=z900. It seems to be a tuning
issue of the branch cost in the backend; a colleague is working on that and
will mave a patch at some time in the future. So, I think you can ignore this,
it's something to be dealt with in the backend.