[mlir][Vector] Update VectorEmulateNarrowType.cpp (1/N)

This is PR 1 in a series of N patches aimed at improving
"VectorEmulateNarrowType.cpp". This is mainly minor refactoring, no
major functional changes are made/added.

This PR renames `srcBits/dstBits` to `oldBits/newBits` to improve
consistency in naming within the file. This is illustrated below:

```cpp
  // Extracted from VectorEmulateNarrowType.cpp
  Type oldElementType = op.getType().getElementType();
  Type newElementType = convertedType.getElementType();

  // BEFORE (mixing old/new and src/dst):
  // int srcBits = oldElementType.getIntOrFloatBitWidth();
  // int dstBits = newElementType.getIntOrFloatBitWidth();

  // AFTER (consistently using old/new):
  int oldBits = oldElementType.getIntOrFloatBitWidth();
  int newBits = newElementType.getIntOrFloatBitWidth();
```

Also adds some comments and unifies related "rewriter notification"
messages.

Author: banach-space

mlir/lib/Dialect/Vector/Transforms/VectorEmulateNarrowType.cpp

@@ -314,14 +314,14 @@ struct ConvertVectorStore final : OpConversionPattern<vector::StoreOp> {
     auto convertedType = cast<MemRefType>(adaptor.getBase().getType());
     Type oldElementType = op.getValueToStore().getType().getElementType();
     Type newElementType = convertedType.getElementType();
-    int srcBits = oldElementType.getIntOrFloatBitWidth();
-    int dstBits = newElementType.getIntOrFloatBitWidth();
+    int oldBits = oldElementType.getIntOrFloatBitWidth();
+    int newBits = newElementType.getIntOrFloatBitWidth();
 
-    if (dstBits % srcBits != 0) {
-      return rewriter.notifyMatchFailure(
-          op, "only dstBits % srcBits == 0 supported");
+    // Check per-element alignment.
+    if (newBits % oldBits != 0) {
+      return rewriter.notifyMatchFailure(op, "unalagined element types");
     }
-    int scale = dstBits / srcBits;
+    int scale = newBits / oldBits;
 
     // Adjust the number of elements to store when emulating narrow types.
     // Here only the 1-D vector store is considered, and the N-D memref types
@@ -346,7 +346,7 @@ struct ConvertVectorStore final : OpConversionPattern<vector::StoreOp> {
     OpFoldResult linearizedIndices;
     std::tie(std::ignore, linearizedIndices) =
         memref::getLinearizedMemRefOffsetAndSize(
-            rewriter, loc, srcBits, dstBits,
+            rewriter, loc, oldBits, newBits,
             stridedMetadata.getConstifiedMixedOffset(),
             stridedMetadata.getConstifiedMixedSizes(),
             stridedMetadata.getConstifiedMixedStrides(),
@@ -385,15 +385,15 @@ struct ConvertVectorMaskedStore final
     auto convertedType = cast<MemRefType>(adaptor.getBase().getType());
     Type oldElementType = op.getValueToStore().getType().getElementType();
     Type newElementType = convertedType.getElementType();
-    int srcBits = oldElementType.getIntOrFloatBitWidth();
-    int dstBits = newElementType.getIntOrFloatBitWidth();
+    int oldBits = oldElementType.getIntOrFloatBitWidth();
+    int newBits = newElementType.getIntOrFloatBitWidth();
 
-    if (dstBits % srcBits != 0) {
-      return rewriter.notifyMatchFailure(
-          op, "only dstBits % srcBits == 0 supported");
+    // Check per-element alignment.
+    if (newBits % oldBits != 0) {
+      return rewriter.notifyMatchFailure(op, "unalagined element types");
     }
 
-    int scale = dstBits / srcBits;
+    int scale = newBits / oldBits;
     int origElements = op.getValueToStore().getType().getNumElements();
     if (origElements % scale != 0)
       return failure();
@@ -404,7 +404,7 @@ struct ConvertVectorMaskedStore final
     memref::LinearizedMemRefInfo linearizedInfo;
     std::tie(linearizedInfo, linearizedIndicesOfr) =
         memref::getLinearizedMemRefOffsetAndSize(
-            rewriter, loc, srcBits, dstBits,
+            rewriter, loc, oldBits, newBits,
             stridedMetadata.getConstifiedMixedOffset(),
             stridedMetadata.getConstifiedMixedSizes(),
             stridedMetadata.getConstifiedMixedStrides(),
@@ -493,14 +493,14 @@ struct ConvertVectorLoad final : OpConversionPattern<vector::LoadOp> {
     auto convertedType = cast<MemRefType>(adaptor.getBase().getType());
     Type oldElementType = op.getType().getElementType();
     Type newElementType = convertedType.getElementType();
-    int srcBits = oldElementType.getIntOrFloatBitWidth();
-    int dstBits = newElementType.getIntOrFloatBitWidth();
+    int oldBits = oldElementType.getIntOrFloatBitWidth();
+    int newBits = newElementType.getIntOrFloatBitWidth();
 
-    if (dstBits % srcBits != 0) {
-      return rewriter.notifyMatchFailure(
-          op, "only dstBits % srcBits == 0 supported");
+    // Check per-element alignment.
+    if (newBits % oldBits != 0) {
+      return rewriter.notifyMatchFailure(op, "unalagined element types");
     }
-    int scale = dstBits / srcBits;
+    int scale = newBits / oldBits;
 
     // Adjust the number of elements to load when emulating narrow types,
     // and then cast back to the original type with vector.bitcast op.
@@ -541,7 +541,7 @@ struct ConvertVectorLoad final : OpConversionPattern<vector::LoadOp> {
     memref::LinearizedMemRefInfo linearizedInfo;
     std::tie(linearizedInfo, linearizedIndices) =
         memref::getLinearizedMemRefOffsetAndSize(
-            rewriter, loc, srcBits, dstBits,
+            rewriter, loc, oldBits, newBits,
             stridedMetadata.getConstifiedMixedOffset(),
             stridedMetadata.getConstifiedMixedSizes(),
             stridedMetadata.getConstifiedMixedStrides(),
@@ -596,14 +596,14 @@ struct ConvertVectorMaskedLoad final
     auto convertedType = cast<MemRefType>(adaptor.getBase().getType());
     Type oldElementType = op.getType().getElementType();
     Type newElementType = convertedType.getElementType();
-    int srcBits = oldElementType.getIntOrFloatBitWidth();
-    int dstBits = newElementType.getIntOrFloatBitWidth();
+    int oldBits = oldElementType.getIntOrFloatBitWidth();
+    int newBits = newElementType.getIntOrFloatBitWidth();
 
-    if (dstBits % srcBits != 0) {
-      return rewriter.notifyMatchFailure(
-          op, "only dstBits % srcBits == 0 supported");
+    // Check per-element alignment.
+    if (newBits % oldBits != 0) {
+      return rewriter.notifyMatchFailure(op, "unalagined element types");
     }
-    int scale = dstBits / srcBits;
+    int scale = newBits / oldBits;
 
     // Adjust the number of elements to load when emulating narrow types,
     // and then cast back to the original type with vector.bitcast op.
@@ -657,7 +657,7 @@ struct ConvertVectorMaskedLoad final
     memref::LinearizedMemRefInfo linearizedInfo;
     std::tie(linearizedInfo, linearizedIndices) =
         memref::getLinearizedMemRefOffsetAndSize(
-            rewriter, loc, srcBits, dstBits,
+            rewriter, loc, oldBits, newBits,
             stridedMetadata.getConstifiedMixedOffset(),
             stridedMetadata.getConstifiedMixedSizes(),
             stridedMetadata.getConstifiedMixedStrides(),
@@ -758,14 +758,14 @@ struct ConvertVectorTransferRead final
     auto convertedType = cast<MemRefType>(adaptor.getSource().getType());
     Type oldElementType = op.getType().getElementType();
     Type newElementType = convertedType.getElementType();
-    int srcBits = oldElementType.getIntOrFloatBitWidth();
-    int dstBits = newElementType.getIntOrFloatBitWidth();
+    int oldBits = oldElementType.getIntOrFloatBitWidth();
+    int newBits = newElementType.getIntOrFloatBitWidth();
 
-    if (dstBits % srcBits != 0) {
-      return rewriter.notifyMatchFailure(
-          op, "only dstBits % srcBits == 0 supported");
+    // Check per-element alignment.
+    if (newBits % oldBits != 0) {
+      return rewriter.notifyMatchFailure(op, "unalagined element types");
     }
-    int scale = dstBits / srcBits;
+    int scale = newBits / oldBits;
 
     auto origElements = op.getVectorType().getNumElements();
 
@@ -781,7 +781,7 @@ struct ConvertVectorTransferRead final
     memref::LinearizedMemRefInfo linearizedInfo;
     std::tie(linearizedInfo, linearizedIndices) =
         memref::getLinearizedMemRefOffsetAndSize(
-            rewriter, loc, srcBits, dstBits,
+            rewriter, loc, oldBits, newBits,
             stridedMetadata.getConstifiedMixedOffset(),
             stridedMetadata.getConstifiedMixedSizes(),
             stridedMetadata.getConstifiedMixedStrides(),