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Improve isSafeToLoadUnconditionally to recognize that GEPs with constant

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indices are safe if the result is known to be within the bounds of the
underlying object.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94829 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2010-01-29 19:19:08 +00:00
parent 01eba39793
commit 3eb4f7e2dd
6 changed files with 83 additions and 22 deletions
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3
include/llvm/Transforms/Utils/Local.h
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@ -38,7 +38,8 @@ template<typename T> class SmallVectorImpl;
/// from this value cannot trap. If it is not obviously safe to load from the
/// specified pointer, we do a quick local scan of the basic block containing
/// ScanFrom, to determine if the address is already accessed.
bool isSafeToLoadUnconditionally(Value *V, Instruction *ScanFrom);
bool isSafeToLoadUnconditionally(Value *V, Instruction *ScanFrom,
const TargetData *TD = 0);
//===----------------------------------------------------------------------===//
// Local constant propagation.