[Support] Simplify CTLog2 (NFC)

[kazutakahirata]

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

[llvmbot]

@llvm/pr-subscribers-llvm-support

Author: Kazu Hirata (kazutakahirata)

Changes

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 --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>();
 }