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[Bug tree-optimization/48317] New: SCCVN does not handle vector constructors
- 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: Mon, 28 Mar 2011 15:03:00 +0000
- Subject: [Bug tree-optimization/48317] New: SCCVN does not handle vector constructors
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48317
Summary: SCCVN does not handle vector constructors
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: rguenth@gcc.gnu.org
SCCVN does not handle CONSTRUCTORs well (they simply get put into a
reference-kind
single operand). This sucks for things like
vect_cst_.239_4355 = {pretmp.88_1931, pretmp.88_1931};
which the vectorizer generates (or which can happen via intrinsics or
generic vector support even earlier).
Not sure how to handle this variable-size code though.