[mlir] Use llvm::bit_width (NFC) (#138648)

kazutakahirata · web-flow · commit 7313c3b1f145 · 2025-05-07T16:16:16.000-07:00
Note that bit_width is implemented as:

  std::numeric_limits&lt;T&gt;::digits - llvm::countl_zero(Value);
diff --git a/mlir/include/mlir/Dialect/SparseTensor/IR/SparseTensor.h b/mlir/include/mlir/Dialect/SparseTensor/IR/SparseTensor.h
@@ -122,7 +122,7 @@ class I64BitSet {
     unsigned m = llvm::countr_zero(storage);
     return m == 64 ? -1 : m;
   }
-  unsigned max() const { return 64 - llvm::countl_zero(storage); }
+  unsigned max() const { return llvm::bit_width(storage); }
   unsigned count() const { return llvm::popcount(storage); }
   bool empty() const { return storage == 0; }
 };

Original file line number	Diff line number	Diff line change
`@@ -122,7 +122,7 @@ class I64BitSet {`
`122`	`122`	`unsigned m = llvm::countr_zero(storage);`
`123`	`123`	`return m == 64 ? -1 : m;`
`124`	`124`	`}`
`125`		`- unsigned max() const { return 64 - llvm::countl_zero(storage); }`
	`125`	`+ unsigned max() const { return llvm::bit_width(storage); }`
`126`	`126`	`unsigned count() const { return llvm::popcount(storage); }`
`127`	`127`	`bool empty() const { return storage == 0; }`
`128`	`128`	`};`