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[Bug tree-optimization/69282] [6 Regression] aarch64/armhf ICE on SPEC2006 464.h264ref at -O3
- From: "wilson at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 05 Feb 2016 17:38:04 +0000
- Subject: [Bug tree-optimization/69282] [6 Regression] aarch64/armhf ICE on SPEC2006 464.h264ref at -O3
- Auto-submitted: auto-generated
- References: <bug-69282-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69282
--- Comment #14 from Jim Wilson <wilson at gcc dot gnu.org> ---
Andrew Pinksi wrote the patch to fix the ICE. I was expecting him to submit
it.
He also pointed out that the code with the patch is inefficient, and can be
optimized by adding some patterns to the aarch64 and arm backends. I thought
he was going to do the aarch64 work. I volunteered to look at the arm backend.
Adding a vcond_mask* pattern gives a sequence one instruction shorter. To get
a sequence two instructions shorter it looks like I need to rewrite some
patterns to use vector rtl instead of unspecs, which seemed inappropriate at
this time. I was going to look at this again when we move to stage 1. This
stuff should perhaps be a separate bug report.