[libc-commits] [libc] [libc] Add bigint casting between word types (PR #111914)

[via libc-commits]

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@@ -927,4 +928,143 @@ TEST(LlvmLibcUIntClassTest, OtherWordTypeTests) {
   ASSERT_EQ(static_cast<int>(a >> 64), 1);
 }
 
+TEST(LlvmLibcUIntClassTest, OtherWordTypeCastTests) {
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lntue wrote:

Then we should have `static_assert` to prevent / detect if it happens in the future.  Otherwise, it might occur with some template parameter computations, and we don't have anything to guarantee its behavior in that case.  Just like I was surprised when seeing that `UInt<10k+>` was actually used at some point.

https://github.com/llvm/llvm-project/pull/111914