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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/33315] stores not commoned by sinking
Date: Thu, 16 Apr 2020 12:40:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D33315

--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #13)
> (In reply to Richard Biener from comment #12)
> > Created attachment 48279 [details]
> > patch
> >=20
> > Patch forward ported to current trunk.
>=20
> Surprisingly small fallout:
>=20
> FAIL: gcc.dg/tree-ssa/split-path-7.c scan-tree-dump-times split-paths
> "Duplicating join block" 0
>=20
> I've thought the approach is too simplistic but I'll do some statistics
> over bootstrap in stage1 and push it if it looks useful - we certainly
> have more "hackish" optimization pieces.

stage3 gcc/ files show (first column is the number of edges we sink from,
second column the number of stores we sink):

2: 3195
3: 193
4: 130
5: 55
6: 28
7: 4
8: 9
9: 3
10: 3
12: 1
13: 6
16: 2
18: 1
22: 2

so it seems worth it.=