[InstCombine] Move portion of SimplifyDemandedUseBits that deals with instructions with multiple uses out to a separate method. NFCI
llvm-svn: 300082
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
index ab15fd8..f163f57 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
+++ b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
@@ -542,6 +542,13 @@
bool SimplifyDemandedBits(Instruction *I, unsigned Op,
const APInt &DemandedMask, APInt &KnownZero,
APInt &KnownOne, unsigned Depth = 0);
+ /// Helper routine of SimplifyDemandedUseBits. It computes KnownZero/KnownOne
+ /// bits. It also tries to handle simplifications that can be done based on
+ /// DemandedMask, but without modifying the Instruction.
+ Value *SimplifyMultipleUseDemandedBits(Instruction *I,
+ const APInt &DemandedMask,
+ APInt &KnownZero, APInt &KnownOne,
+ unsigned Depth, Instruction *CxtI);
/// Helper routine of SimplifyDemandedUseBits. It tries to simplify demanded
/// bit for "r1 = shr x, c1; r2 = shl r1, c2" instruction sequence.
Value *SimplifyShrShlDemandedBits(Instruction *Lsr, Instruction *Sftl,