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[Bug tree-optimization/69047] memcpy is not as optimized as union is
- 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: Fri, 26 Aug 2016 12:34:15 +0000
- Subject: [Bug tree-optimization/69047] memcpy is not as optimized as union is
- Auto-submitted: auto-generated
- References: <bug-69047-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69047
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Aug 26 12:33:43 2016
New Revision: 239778
URL: https://gcc.gnu.org/viewcvs?rev=239778&root=gcc&view=rev
Log:
2016-08-26 Richard Biener <rguenther@suse.de>
PR tree-optimization/69047
* tree-ssa.c (maybe_rewrite_mem_ref_base): Handle general bitfield
extracts similar to what FRE does.
(non_rewritable_mem_ref_base): Likewise.
* gcc.dg/pr69047.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/pr69047.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa.c