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GlobalStatus: Don't walk use-lists of ConstantData

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Return early from llvm::isSafeToDestroyConstant() whenever the value
`isa<ConstantData>()`.  These constants are shared across the
LLVMContext.  We never really want to delete them here, and walking
their use-lists can be very expensive.

(This is motivated by an eventual goal of removing use-lists entirely
from ConstantData.)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282320 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith 2016-09-24 02:30:11 +00:00
parent e2e54904b7
commit c1ce9acb64
1 changed files with 1 additions and 1 deletions
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lib/Transforms/Utils/GlobalStatus.cpp
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@ -35,7 +35,7 @@ bool llvm::isSafeToDestroyConstant(const Constant *C) {
if (isa<GlobalValue>(C))
return false;
if (isa<ConstantInt>(C) || isa<ConstantFP>(C))
if (isa<ConstantData>(C))
return false;
for (const User *U : C->users())