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add a fixme

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76324 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-07-18 18:49:04 +00:00
parent fc2271f3f5
commit 93f2491cf8
1 changed files with 5 additions and 0 deletions
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5
lib/Transforms/Utils/InlineCost.cpp
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@ -45,6 +45,11 @@ unsigned InlineCostAnalyzer::FunctionInfo::
// We can't constant propagate instructions which have effects or
// read memory.
//
// FIXME: It would be nice to capture the fact that a load from a
// pointer-to-constant-global is actually a *really* good thing to zap.
// Unfortunately, we don't know the pointer that may get propagated here,
// so we can't make this decision.
if (Inst.mayReadFromMemory() || Inst.mayHaveSideEffects() ||
isa<AllocationInst>(Inst))
continue;