[ValueTracking][SelectionDAG] Rename ComputeMinSignedBits->ComputeMaxSignificantBits. NFC

This function returns an upper bound on the number of bits needed
to represent the signed value. Use "Max" to match similar functions
in KnownBits like countMaxActiveBits.

Rename APInt::getMinSignedBits->getSignificantBits. Keeping the old
name around to keep this patch size down. Will do a bulk rename as
follow up.

Rename KnownBits::countMaxSignedBits->countMaxSignificantBits.

Reviewed By: lebedev.ri, RKSimon, spatel

Differential Revision: https://reviews.llvm.org/D116522

1 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index 7876e20..16bd0ad 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -396,10 +396,10 @@ unsigned llvm::ComputeNumSignBits(const Value *V, const DataLayout &DL,
       V, Depth, Query(DL, AC, safeCxtI(V, CxtI), DT, UseInstrInfo));
 }
 
-unsigned llvm::ComputeMinSignedBits(const Value *V, const DataLayout &DL,
-                                    unsigned Depth, AssumptionCache *AC,
-                                    const Instruction *CxtI,
-                                    const DominatorTree *DT) {
+unsigned llvm::ComputeMaxSignificantBits(const Value *V, const DataLayout &DL,
+                                         unsigned Depth, AssumptionCache *AC,
+                                         const Instruction *CxtI,
+                                         const DominatorTree *DT) {
   unsigned SignBits = ComputeNumSignBits(V, DL, Depth, AC, CxtI, DT);
   return V->getType()->getScalarSizeInBits() - SignBits + 1;
 }