[libc] Fix compilation error on targets without 128-bit int types

[overmighty]

See Buildbot failures:

• https://lab.llvm.org/buildbot/#/builders/11/builds/743
• https://lab.llvm.org/buildbot/#/builders/182/builds/362

[overmighty]

cc @lntue @michaelrj-google

[llvmbot]

@llvm/pr-subscribers-libc

Author: OverMighty (overmighty)

Changes

See Buildbot failures:

• https://lab.llvm.org/buildbot/#/builders/11/builds/743
• https://lab.llvm.org/buildbot/#/builders/182/builds/362

---

Full diff: https://github.com/llvm/llvm-project/pull/97039.diff

2 Files Affected:

• (modified) libc/src/__support/high_precision_decimal.h (+2-1)
• (modified) libc/test/src/__support/math_extras_test.cpp (+1-1)

diff --git a/libc/src/__support/high_precision_decimal.h b/libc/src/__support/high_precision_decimal.h
index 2c5a349e4495e..6a22554165014 100644
--- a/libc/src/__support/high_precision_decimal.h
+++ b/libc/src/__support/high_precision_decimal.h
@@ -409,7 +409,8 @@ class HighPrecisionDecimal {
       result *= 10;
       ++cur_digit;
     }
-    return result + this->should_round_up(this->decimal_point, round);
+    return result + static_cast<unsigned int>(
+                        this->should_round_up(this->decimal_point, round));
   }
 
   // Extra functions for testing.
diff --git a/libc/test/src/__support/math_extras_test.cpp b/libc/test/src/__support/math_extras_test.cpp
index 0047888965177..9f9036b9d5cdf 100644
--- a/libc/test/src/__support/math_extras_test.cpp
+++ b/libc/test/src/__support/math_extras_test.cpp
@@ -102,7 +102,7 @@ TYPED_TEST(LlvmLibcBitTest, CountZeros, UnsignedTypesNoBigInt) {
 }
 
 using UnsignedTypes = testing::TypeList<
-#if defined(__SIZEOF_INT128__)
+#if defined(LIBC_TYPES_HAS_INT128)
     __uint128_t,
 #endif
     unsigned char, unsigned short, unsigned int, unsigned long,

[overmighty]

I caught this as I tried to reproduce what was happening on the failed Buildbot builds by just not defining LIBC_TYPES_HAS_INT128. It won't cause a compilation error on real builds where 128-bit int types are either really available or they're not. This is basically a cleanup.