[llvm] [Support] Simplify CTLog2 (NFC) (PR #143559)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-support

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>

We can drop kValue > 0 in CTLog2 because llvm::isPowerOf2_64 returns
false on input 0.


---
Full diff: https://github.com/llvm/llvm-project/pull/143559.diff


1 Files Affected:

- (modified) llvm/include/llvm/Support/MathExtras.h (+1-2) 


``````````diff
diff --git a/llvm/include/llvm/Support/MathExtras.h b/llvm/include/llvm/Support/MathExtras.h
index 246080aa45ce0..ae3150e5602ee 100644
--- a/llvm/include/llvm/Support/MathExtras.h
+++ b/llvm/include/llvm/Support/MathExtras.h
@@ -328,8 +328,7 @@ inline bool isShiftedMask_64(uint64_t Value, unsigned &MaskIdx,
 /// Compile time Log2.
 /// Valid only for positive powers of two.
 template <size_t kValue> constexpr size_t CTLog2() {
-  static_assert(kValue > 0 && llvm::isPowerOf2_64(kValue),
-                "Value is not a valid power of 2");
+  static_assert(llvm::isPowerOf2_64(kValue), "Value is not a valid power of 2");
   return 1 + CTLog2<kValue / 2>();
 }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/143559