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[Bug middle-end/81161] poor code concatenating bitfields
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 22 Jun 2017 09:24:19 +0000
- Subject: [Bug middle-end/81161] poor code concatenating bitfields
- Auto-submitted: auto-generated
- References: <bug-81161-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81161
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-06-22
Ever confirmed|0 |1
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Enhance gimple-ssa-store-merging.c to handle non-constants aka marry it with
the bswap pass (in tree-ssa-math-opts.c) which does the analysis (only
on byte granularity...) seeing that all values stem from shifting/oring
of parts of the same value.