[llvm] [Support] Simplify isUInt (NFC) (PR #155976)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-support

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/155976.diff


1 Files Affected:

- (modified) llvm/include/llvm/Support/MathExtras.h (+1-9) 


``````````diff
diff --git a/llvm/include/llvm/Support/MathExtras.h b/llvm/include/llvm/Support/MathExtras.h
index c9dae7ae7346d..96ebbd61e367c 100644
--- a/llvm/include/llvm/Support/MathExtras.h
+++ b/llvm/include/llvm/Support/MathExtras.h
@@ -196,16 +196,8 @@ constexpr bool isShiftedInt(int64_t x) {
 
 /// Checks if an unsigned integer fits into the given bit width.
 template <unsigned N> constexpr bool isUInt(uint64_t x) {
-  if constexpr (N == 0)
-    return 0 == x;
-  if constexpr (N == 8)
-    return static_cast<uint8_t>(x) == x;
-  if constexpr (N == 16)
-    return static_cast<uint16_t>(x) == x;
-  if constexpr (N == 32)
-    return static_cast<uint32_t>(x) == x;
   if constexpr (N < 64)
-    return x < (UINT64_C(1) << (N));
+    return (x >> N) == 0;
   (void)x; // MSVC v19.25 warns that x is unused.
   return true;
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/155976