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[Bug tree-optimization/49645] [4.7 regression] g++.dg/tree-ssa/pr8781.C FAILs on Tru64 UNIX
- 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: Wed, 6 Jul 2011 08:21:53 +0000
- Subject: [Bug tree-optimization/49645] [4.7 regression] g++.dg/tree-ssa/pr8781.C FAILs on Tru64 UNIX
- Auto-submitted: auto-generated
- References: <bug-49645-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49645
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2011.07.06 08:21:35
AssignedTo|unassigned at gcc dot |rguenth at gcc dot gnu.org
|gnu.org |
Target Milestone|--- |4.7.0
Ever Confirmed|0 |1
--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-07-06 08:21:35 UTC ---
Weird. I can't see what should be target specific in this test (all relevant
functions are inlined).
Ah, on x86_64 I see that SRA did something, so I see in the .esra dump:
<bb 2>:
pred = f;
SR.36_52 = &pred;
SR.37_51 = SR.36_52;
MEM[(struct noop_t *)&pred].pred = SR.37_51;
SR.38_50 = &pred;
SR.39_48 = SR.38_50;
MEM[(struct noop_t *)&pred].pred = SR.39_48;
SR.40_47 = &pred;
SR.41_45 = SR.40_47;
MEM[(struct noop_t *)&pred].pred = SR.41_45;
SR.42_44 = &pred;
SR.43_42 = SR.42_44;
MEM[(struct noop_t *)&pred].pred = SR.43_42;
...
D.2683_15 = D.2693_14->pred;
D.2691_16 = D.2683_15->pred;
D.2684_17 = D.2691_16->pred;
D.2690_18 = D.2684_17->pred;
D.2685_19 = D.2690_18->pred;
D.2689_20 = D.2685_19->pred;
D.2686_21 = D.2689_20->pred;
D.2688_22 = D.2686_21->pred;
D.2687_23 = *D.2688_22;
D.2682_24 = D.2687_23 ();
On the 4.6 branch FRE1 is after final inlining, so maybe there is enough
cleanup there to make it work.
Still FRE should work this out without SRA, so I'm taking this one.