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Global variables with strong definitions cannot be freed

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With the current deref semantics, this is redundant - since we assume that anything which is dereferenceable (ever) can't be freed - but it becomes neccessary for the deref-at-point semantics.

Testing wise, this is covered by test/CodeGen/X86/hoist-invariant-load.ll when -use-dereferenceable-at-point-semantics is active.  I didn't bother duplicating the command line since a) it's an in-development mode, and b) the change is pretty obvious.
This commit is contained in:
Philip Reames 2021-07-14 13:19:48 -07:00
parent b12ecd2ebd
commit 652d77cf2f
1 changed files with 1 additions and 0 deletions
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lib/IR/Value.cpp
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@ -897,6 +897,7 @@ uint64_t Value::getPointerDereferenceableBytes(const DataLayout &DL,
// CanBeNull flag.
DerefBytes = DL.getTypeStoreSize(GV->getValueType()).getFixedSize();
CanBeNull = false;
CanBeFreed = false;
}
}
return DerefBytes;