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Clean up doxygen syntax and reword comments to flow better, have a brief
section, and not have unfinished sentence fragments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220147 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -22,13 +22,16 @@
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#include "llvm/IR/Operator.h"
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using namespace llvm;
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/// AreEquivalentAddressValues - Test if A and B will obviously have the same
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/// value. This includes recognizing that %t0 and %t1 will have the same
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/// \brief Test if A and B will obviously have the same value.
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///
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/// This includes recognizing that %t0 and %t1 will have the same
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/// value in code like this:
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/// \code
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/// %t0 = getelementptr \@a, 0, 3
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/// store i32 0, i32* %t0
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/// %t1 = getelementptr \@a, 0, 3
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/// %t2 = load i32* %t1
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/// \endcode
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///
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static bool AreEquivalentAddressValues(const Value *A, const Value *B) {
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// Test if the values are trivially equivalent.
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@ -119,23 +122,25 @@ bool llvm::isSafeToLoadUnconditionally(Value *V, Instruction *ScanFrom,
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return false;
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}
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/// FindAvailableLoadedValue - Scan the ScanBB block backwards (starting at the
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/// instruction before ScanFrom) checking to see if we have the value at the
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/// \brief Scan the ScanBB block backwards to see if we have the value at the
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/// memory address *Ptr locally available within a small number of instructions.
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/// If the value is available, return it.
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///
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/// If not, return the iterator for the last validated instruction that the
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/// value would be live through. If we scanned the entire block and didn't find
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/// something that invalidates *Ptr or provides it, ScanFrom would be left at
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/// begin() and this returns null. ScanFrom could also be left
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/// The scan starts from \c ScanFrom. \c MaxInstsToScan specifies the maximum
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/// instructions to scan in the block. If it is set to \c 0, it will scan the whole
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/// block.
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///
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/// MaxInstsToScan specifies the maximum instructions to scan in the block. If
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/// it is set to 0, it will scan the whole block. You can also optionally
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/// specify an alias analysis implementation, which makes this more precise.
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/// If the value is available, this function returns it. If not, it returns the
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/// iterator for the last validated instruction that the value would be live
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/// through. If we scanned the entire block and didn't find something that
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/// invalidates \c *Ptr or provides it, \c ScanFrom is left at the last
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/// instruction processed and this returns null.
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///
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/// If AATags is non-null and a load or store is found, the AA tags from the
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/// load or store are recorded there. If there are no AA tags or if no access
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/// is found, it is left unmodified.
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/// You can also optionally specify an alias analysis implementation, which
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/// makes this more precise.
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///
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/// If \c AATags is non-null and a load or store is found, the AA tags from the
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/// load or store are recorded there. If there are no AA tags or if no access is
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/// found, it is left unmodified.
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Value *llvm::FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
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BasicBlock::iterator &ScanFrom,
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unsigned MaxInstsToScan,
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