[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, 2 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
index 02bd0bd..303038d 100644
--- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -4940,7 +4940,8 @@ static bool eliminateDeadSwitchCases(SwitchInst *SI, DomTreeUpdater *DTU,
   // We can also eliminate cases by determining that their values are outside of
   // the limited range of the condition based on how many significant (non-sign)
   // bits are in the condition value.
-  unsigned MaxSignificantBitsInCond = ComputeMinSignedBits(Cond, DL, 0, AC, SI);
+  unsigned MaxSignificantBitsInCond =
+      ComputeMaxSignificantBits(Cond, DL, 0, AC, SI);
 
   // Gather dead cases.
   SmallVector<ConstantInt *, 8> DeadCases;