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It is not safe to sink an alloca into a stacksave/stackrestore pair, so don't do that. <rdar://problem/10352360>

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143093 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-10-27 01:33:51 +00:00
parent 6d64b3adab
commit 8ecde6cbf8
2 changed files with 40 additions and 14 deletions
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lib/Transforms/Scalar/IndVarSimplify.cpp
+6 -5
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@@ -1680,11 +1680,12 @@ void IndVarSimplify::SinkUnusedInvariants(Loop *L) {
if (isa<LandingPadInst>(I))
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;
// Don't sink alloca: we never want to sink static alloca's out of the
// entry block, and correctly sinking dynamic alloca's requires
// checks for stacksave/stackrestore intrinsics.
// FIXME: Refactor this check somehow?
if (isa<AllocaInst>(I))
continue;
// Determine if there is a use in or before the loop (direct or
// otherwise).