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[Bug tree-optimization/41783] r151561 (PRE fix) regresses zeusmp
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 21 Oct 2009 15:07:12 -0000
- Subject: [Bug tree-optimization/41783] r151561 (PRE fix) regresses zeusmp
- References: <bug-41783-12182@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from rguenth at gcc dot gnu dot org 2009-10-21 15:07 -------
Btw, the 2nd insertion is really weird (the first one in bb9 is just loop
invariant motion).
<bb 14>:
pretmp.7_45 = rootr.dt;
goto <bb 4>;
<bb 13>:
<bb 5>:
# prephitmp.8_48 = PHI <prephitmp.8_47(12), prephitmp.8_50(13)>
D.1375_18 = (real(kind=8)) i_3;
D.1376_19 = prephitmp.8_48;
fact_20 = D.1375_18 * D.1376_19;
if (js_9(D) <= D.1351_12)
goto <bb 15>;
else
goto <bb 16>;
it looks to me that we fail to translate over the first loop and its
header copy - something that partial-PRE ought to have accomplished.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41783