[SVE] Remove calls to getBitWidth from Analysis

[ctetreau]

rebase

[ctetreau]

rebase

[efriedma]

llvm/include/llvm/Analysis/TargetTransformInfoImpl.h

634–635

Fix the comment?

[ctetreau]

fix stale comment

[efriedma]

LGTM

llvm/include/llvm/Analysis/TargetTransformInfoImpl.h

if (isa<ConstantDataVector>(Val) || isa<ConstantVector>(Val)) {
       const auto *VectorValue = cast<Constant>(Val);
 
       // In case of a vector need to pick the max between the min
       // required size for each element
       auto *VT = cast<VectorType>(Val->getType());
 
       // Assume unsigned elements
       isSigned = false;
 
-      // The max required size is the total vector width divided by num
-      // of elements in the vector
-      unsigned MaxRequiredSize = VT->getBitWidth() / VT->getNumElements();
+      // The max required size is the size of the vector element type
+      unsigned MaxRequiredSize =
+          VT->getElementType()->getPrimitiveSizeInBits().getFixedSize();
 
       unsigned MinRequiredSize = 0;
       for (unsigned i = 0, e = VT->getNumElements(); i < e; ++i) {
         if (auto *IntElement =
                 dyn_cast<ConstantInt>(VectorValue->getAggregateElement(i))) {
           bool signedElement = IntElement->getValue().isNegative();
           // Get the element min required size.
           unsigned ElementMinRequiredSize =