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Fix SCEVExpander to handle loops with no preheader when LSR gives it a

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"phony" insertion point.

Fixes rdar://10619599: "SelectionDAGBuilder shouldn't visit PHI nodes!" assert


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147439 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2012-01-02 21:25:10 +00:00
parent cf6bd5a7c3
commit 0f8cd56bfd
2 changed files with 56 additions and 0 deletions
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6
lib/Analysis/ScalarEvolutionExpander.cpp
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@@ -1443,6 +1443,12 @@ Value *SCEVExpander::expand(const SCEV *S) {
if (!L) break;
if (BasicBlock *Preheader = L->getLoopPreheader())
InsertPt = Preheader->getTerminator();
else {
// LSR sets the insertion point for AddRec start/step values to the
// block start to simplify value reuse, even though it's an invalid
// position. SCEVExpander must correct for this in all cases.
InsertPt = L->getHeader()->getFirstInsertionPt();
}
} else {
// If the SCEV is computable at this level, insert it into the header
// after the PHIs (and after any other instructions that we've inserted