[llvm] [CodeGen] Remove checks for vectors in unsigned division prior to computing leading zeros (PR #99524)

[Craig Topper via llvm-commits]

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@@ -5180,7 +5180,9 @@ MachineInstr *CombinerHelper::buildUDivUsingMul(MachineInstr &MI) {
   LLT ScalarShiftAmtTy = ShiftAmtTy.getScalarType();
 
   unsigned KnownLeadingZeros =
-      KB ? KB->getKnownBits(LHS).countMinLeadingZeros() : 0;
+      (!MI.getFlag(MachineInstr::MIFlag::IsExact) && KB)
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topperc wrote:

This is not related to vectors and is not mentioned in the description. Separate patch?

https://github.com/llvm/llvm-project/pull/99524