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Tweak the check for promotable alloca's to handle

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debug intrinsics correctly.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66225 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2009-03-06 00:42:50 +00:00
parent f70bda2f81
commit 2511abf6e7
1 changed files with 7 additions and 1 deletions
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8
lib/Transforms/Utils/PromoteMemoryToRegister.cpp
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@ -81,9 +81,15 @@ bool llvm::isAllocaPromotable(const AllocaInst *AI) {
if (SI->isVolatile()) if (SI->isVolatile())
return false; return false;
} else if (const BitCastInst *BC = dyn_cast<BitCastInst>(*UI)) { } else if (const BitCastInst *BC = dyn_cast<BitCastInst>(*UI)) {
// Uses by dbg info shouldn't inhibit promotion. // A bitcast that does not feed into debug info inhibits promotion.
if (!BC->hasOneUse() || !isa<DbgInfoIntrinsic>(*BC->use_begin())) if (!BC->hasOneUse() || !isa<DbgInfoIntrinsic>(*BC->use_begin()))
return false; return false;
// If the only use is by debug info, this alloca will not exist in
// non-debug code, so don't try to promote; this ensures the same
// codegen with debug info. Otherwise, debug info should not
// inhibit promotion (but we must examine other uses).
if (AI->hasOneUse())
return false;
} else { } else {
return false; return false;
} }