[llvm] [DAG] Fold (vt trunc (extload (vt x))) -> (vt load x) (PR #75229)

[Jay Foad via llvm-commits]

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@@ -14818,15 +14818,14 @@ SDValue DAGCombiner::visitTRUNCATE(SDNode *N) {
     if (SDValue Reduced = reduceLoadWidth(N))
       return Reduced;
 
-    // Handle the case where the load remains an extending load even
+    // Handle the case where the load remains a normal/extending load even
     // after truncation.
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jayfoad wrote:

Nit: maybe rewrite this comment? "normal/extending load" seems to cover all relevant options so it's not really saying anything useful now as-is?

Maybe something like "Handle the case where the truncated result is at least as wide as the loaded type"

https://github.com/llvm/llvm-project/pull/75229