http://llvm.org/bugs/show_bug.cgi?id=5837
Summary: loop rotate (really ssaupdate) inserts many duplicate
phi nodes
Product: libraries
Version: 1.0
Platform: PC
OS/Version: All
Status: NEW
Keywords: code-quality
Severity: normal
Priority: P2
Component: Transformation Utilities
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Loop rotate transforms this input testcase with no phi nodes to this:
for.body: ; preds = %bb.nph, %for.cond
%j.05 = phi i64 [ 1, %bb.nph ], [ %j.0, %for.cond ] ; <i64> [#uses=1]
%j.04 = phi i64 [ 1, %bb.nph ], [ %j.0, %for.cond ] ; <i64> [#uses=1]
%j.03 = phi i64 [ 1, %bb.nph ], [ %j.0, %for.cond ] ; <i64> [#uses=1]
%j.02 = phi i64 [ 1, %bb.nph ], [ %j.0, %for.cond ] ; <i64> [#uses=1]
%arrayidx = getelementptr inbounds double* %G, i64 %j.05 ; <double*>
[#uses=1]
%tmp3 = load double* %arrayidx ; <double> [#uses=1]
%sub = sub i64 %j.04, 1 ; <i64> [#uses=1]
%arrayidx6 = getelementptr inbounds double* %G, i64 %sub ; <double*>
[#uses=1]
This can't be good.
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