Differential D87494 Diff 293657 llvm/include/llvm/Analysis/ScalarEvolution.h

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llvm/include/llvm/Analysis/ScalarEvolution.h

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/// Compute \p LHS - \p RHS and returns the result as an APInt if it is a		/// Compute \p LHS - \p RHS and returns the result as an APInt if it is a
/// constant, and None if it isn't.		/// constant, and None if it isn't.
///		///
/// This is intended to be a cheaper version of getMinusSCEV. We can be		/// This is intended to be a cheaper version of getMinusSCEV. We can be
/// frugal here since we just bail out of actually constructing and		/// frugal here since we just bail out of actually constructing and
/// canonicalizing an expression in the cases where the result isn't going		/// canonicalizing an expression in the cases where the result isn't going
/// to be a constant.		/// to be a constant.
		public:
		bjopeUnsubmitted Done Reply Inline Actions nit: Probably cleaner to move this declaration up into the public section, now when it is made available in the public API. bjope: nit: Probably cleaner to move this declaration up into the public section, now when it is made…
Optional<APInt> computeConstantDifference(const SCEV LHS, const SCEV RHS);		Optional<APInt> computeConstantDifference(const SCEV LHS, const SCEV RHS);

		private:
/// Drop memoized information computed for S.		/// Drop memoized information computed for S.
void forgetMemoizedResults(const SCEV *S);		void forgetMemoizedResults(const SCEV *S);

/// Return an existing SCEV for V if there is one, otherwise return nullptr.		/// Return an existing SCEV for V if there is one, otherwise return nullptr.
const SCEV getExistingSCEV(Value V);		const SCEV getExistingSCEV(Value V);

/// Return false iff given SCEV contains a SCEVUnknown with NULL value-		/// Return false iff given SCEV contains a SCEVUnknown with NULL value-
/// pointer.		/// pointer.
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