[libc][bazel] Port bb7cea0

utils/bazel/llvm-project-overlay/libc/BUILD.bazel

@@ -492,6 +492,7 @@ libc_support_library(
     name = "__support_macros_properties_types",
     hdrs = ["src/__support/macros/properties/types.h"],
     deps = [
+        ":__support_macros_config",
         ":__support_macros_properties_architectures",
         ":__support_macros_properties_compiler",
         ":__support_macros_properties_cpu_features",
@@ -1077,6 +1078,24 @@ libc_support_library(
     ],
 )
 
+libc_support_library(
+    name = "__support_fputil_bfloat16",
+    hdrs = ["src/__support/FPUtil/bfloat16.h"],
+    deps = [
+        ":__support_cpp_bit",
+        ":__support_cpp_type_traits",
+        ":__support_fputil_cast",
+        ":__support_fputil_dyadic_float",
+        ":__support_macros_config",
+        ":__support_macros_properties_types",
+    ],
+)
+
+alias(
+    name = "bfloat16",  # Alias for test/src/math:bfloat16_test.
+    actual = ":__support_fputil_bfloat16",
+)
+
 libc_support_library(
     name = "__support_fputil_cast",
     hdrs = ["src/__support/FPUtil/cast.h"],

utils/bazel/llvm-project-overlay/libc/test/src/__support/FPUtil/BUILD.bazel

@@ -23,6 +23,17 @@ libc_test(
     ],
 )
 
+libc_test(
+    name = "bfloat16_test",
+    srcs = ["bfloat16_test.cpp"],
+    deps = [
+        "//libc:__support_fputil_bfloat16",
+        "//libc/test/UnitTest:fp_test_helpers",
+        "//libc/utils/MPFRWrapper:mp_common",
+        "//libc/utils/MPFRWrapper:mpfr_wrapper",
+    ],
+)
+
 libc_test(
     name = "dyadic_float_test",
     srcs = ["dyadic_float_test.cpp"],

utils/bazel/llvm-project-overlay/libc/utils/MPFRWrapper/BUILD.bazel

@@ -42,6 +42,7 @@ libc_test_library(
         "//libc:__support_cpp_string",
         "//libc:__support_cpp_string_view",
         "//libc:__support_cpp_type_traits",
+        "//libc:__support_fputil_bfloat16",
         "//libc:__support_fputil_cast",
         "//libc:__support_fputil_fp_bits",
         "//libc:__support_macros_config",