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[Bug target/63594] [5 Regression] ICE: in ix86_vector_duplicate_value, at config/i386/i386.c:39831 with -mavx512f
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 20 Oct 2014 17:04:53 +0000
- Subject: [Bug target/63594] [5 Regression] ICE: in ix86_vector_duplicate_value, at config/i386/i386.c:39831 with -mavx512f
- Auto-submitted: auto-generated
- References: <bug-63594-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63594
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 33763
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33763&action=edit
gcc5-pr63594-wip2.patch
Updated WIP patch, which attempts to generate better code using inter-unit
moves, but have also memory as an alternative, so it allows RA to choose what
is best. This still generates non-perfect code for V2DI/V4DI loads from GPRs
without -mavx512f (but e.g. vec_concatv2di uses Yi constraint).
And, for AVX512-{F,BW,VL}, I'm surprised that the broadcasts from gprs are done
as different instructions from broadcasts from memory or vector reg, I would
have thought that must have been done using a single insn with alternatives.