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[Bug tree-optimization/77283] [7 Regression] Revision 238005 disables loop unrolling
- 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, 18 Aug 2016 12:11:55 +0000
- Subject: [Bug tree-optimization/77283] [7 Regression] Revision 238005 disables loop unrolling
- Authentication-results: sourceware.org; auth=none
- Auto-submitted: auto-generated
- References: <bug-77283-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77283
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 39469
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39469&action=edit
patch
Ok, causes
FAIL: gcc.dg/tree-ssa/pr69270.c scan-tree-dump-not dom3 "bit_xor"
FAIL: gcc.dg/tree-ssa/pr69270.c scan-tree-dump-times dom3 "Folded to: _[0-9]+ =
0;" 1
FAIL: gcc.dg/tree-ssa/pr69270.c scan-tree-dump-times dom3 "Folded to: _[0-9]+ =
1;" 1
FAIL: gcc.dg/tree-ssa/pr69270.c scan-tree-dump-times dom3 "Replaced
.bufferstep_
[0-9]+. with constant .0." 1
FAIL: gcc.dg/tree-ssa/pr69270.c scan-tree-dump-times dom3 "Replaced
.bufferstep_
[0-9]+. with constant .1." 1
which is where path-splitting exposes a jump threading opportunity it seems
as jump threading is not happy to perform the operation in one go.
Also my adjustment of gcc.dg/tree-ssa/split-path-7.c was only good in my dev
tree for some reason. Otherwise bootstrapped / tested on
x86_64-unknown-linux-gnu.