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Special-case static allocas in IndVarSimplify's loop invariant

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sinking code, since they are special. If the loop preheader happens
to be the entry block of a function, don't sink static allocas
out of it. This fixes PR4775.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80010 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-08-25 17:42:10 +00:00
parent 613bf1ef01
commit 76f497a351
2 changed files with 36 additions and 0 deletions
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5
lib/Transforms/Scalar/IndVarSimplify.cpp
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@@ -553,6 +553,11 @@ void IndVarSimplify::SinkUnusedInvariants(Loop *L) {
// dominates the exit block.
if (I->mayHaveSideEffects() || I->mayReadFromMemory())
continue;
// Don't sink static AllocaInsts out of the entry block, which would
// turn them into dynamic allocas!
if (AllocaInst *AI = dyn_cast<AllocaInst>(I))
if (AI->isStaticAlloca())
continue;
// Determine if there is a use in or before the loop (direct or
// otherwise).
bool UsedInLoop = false;