[libc-commits] [libc] [libc][math][c23] Add {frexp, ilogb, ldexp, llogb, logb, modf}f16 C23 math functions (PR #94758)

via libc-commits libc-commits at lists.llvm.org
Fri Jun 7 07:09:57 PDT 2024


llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libc

Author: OverMighty (overmighty)

<details>
<summary>Changes</summary>



---

Patch is 49.19 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/94758.diff


36 Files Affected:

- (modified) libc/config/linux/aarch64/entrypoints.txt (+6) 
- (modified) libc/config/linux/x86_64/entrypoints.txt (+6) 
- (modified) libc/docs/c23.rst (+1-1) 
- (modified) libc/docs/math/index.rst (+6-6) 
- (modified) libc/spec/spec.td (+1) 
- (modified) libc/spec/stdc.td (+6) 
- (modified) libc/src/__support/FPUtil/CMakeLists.txt (+1) 
- (modified) libc/src/__support/FPUtil/ManipulationFunctions.h (+4-3) 
- (modified) libc/src/__support/FPUtil/NormalFloat.h (+7-4) 
- (modified) libc/src/__support/FPUtil/dyadic_float.h (+5) 
- (modified) libc/src/math/CMakeLists.txt (+6) 
- (added) libc/src/math/frexpf16.h (+20) 
- (modified) libc/src/math/generic/CMakeLists.txt (+79) 
- (added) libc/src/math/generic/frexpf16.cpp (+19) 
- (added) libc/src/math/generic/ilogbf16.cpp (+19) 
- (added) libc/src/math/generic/ldexpf16.cpp (+19) 
- (added) libc/src/math/generic/llogbf16.cpp (+19) 
- (added) libc/src/math/generic/logbf16.cpp (+17) 
- (added) libc/src/math/generic/modff16.cpp (+19) 
- (added) libc/src/math/ilogbf16.h (+20) 
- (added) libc/src/math/ldexpf16.h (+20) 
- (added) libc/src/math/llogbf16.h (+20) 
- (added) libc/src/math/logbf16.h (+20) 
- (added) libc/src/math/modff16.h (+20) 
- (modified) libc/test/src/math/smoke/CMakeLists.txt (+108-8) 
- (modified) libc/test/src/math/smoke/FrexpTest.h (-1) 
- (modified) libc/test/src/math/smoke/ILogbTest.h (+11-7) 
- (modified) libc/test/src/math/smoke/LdExpTest.h (+8-8) 
- (modified) libc/test/src/math/smoke/LogbTest.h (+7-4) 
- (modified) libc/test/src/math/smoke/ModfTest.h (+7-4) 
- (added) libc/test/src/math/smoke/frexpf16_test.cpp (+13) 
- (added) libc/test/src/math/smoke/ilogbf16_test.cpp (+13) 
- (added) libc/test/src/math/smoke/ldexpf16_test.cpp (+13) 
- (added) libc/test/src/math/smoke/llogbf16_test.cpp (+13) 
- (added) libc/test/src/math/smoke/logbf16_test.cpp (+13) 
- (added) libc/test/src/math/smoke/modff16_test.cpp (+13) 


``````````diff
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index 33ecff813a1fb..9e17ee65616dd 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -515,12 +515,18 @@ if(LIBC_TYPES_HAS_FLOAT16)
     libc.src.math.fminimum_magf16
     libc.src.math.fminimum_mag_numf16
     libc.src.math.fminimum_numf16
+    libc.src.math.frexpf16
     libc.src.math.fromfpf16
     libc.src.math.fromfpxf16
+    libc.src.math.ilogbf16
+    libc.src.math.ldexpf16
+    libc.src.math.llogbf16
     libc.src.math.llrintf16
     libc.src.math.llroundf16
+    libc.src.math.logbf16
     libc.src.math.lrintf16
     libc.src.math.lroundf16
+    libc.src.math.modff16
     libc.src.math.nearbyintf16
     libc.src.math.nextafterf16
     libc.src.math.nextdownf16
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index e3ca544ae0185..befbdf7ff4e3b 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -547,12 +547,18 @@ if(LIBC_TYPES_HAS_FLOAT16)
     libc.src.math.fminimum_magf16
     libc.src.math.fminimum_mag_numf16
     libc.src.math.fminimum_numf16
+    libc.src.math.frexpf16
     libc.src.math.fromfpf16
     libc.src.math.fromfpxf16
+    libc.src.math.ilogbf16
+    libc.src.math.ldexpf16
+    libc.src.math.llogbf16
     libc.src.math.llrintf16
     libc.src.math.llroundf16
+    libc.src.math.logbf16
     libc.src.math.lrintf16
     libc.src.math.lroundf16
+    libc.src.math.modff16
     libc.src.math.nearbyintf16
     libc.src.math.nextafterf16
     libc.src.math.nextdownf16
diff --git a/libc/docs/c23.rst b/libc/docs/c23.rst
index 71232cc004c70..fec9b24bbd581 100644
--- a/libc/docs/c23.rst
+++ b/libc/docs/c23.rst
@@ -50,7 +50,7 @@ Additions:
   * issignaling
   * issubnormal
   * iszero
-  * llogb*
+  * llogb* |check|
   * pown*
   * powr*
   * rootn*
diff --git a/libc/docs/math/index.rst b/libc/docs/math/index.rst
index b9507f0887cd7..c26a9699f2da5 100644
--- a/libc/docs/math/index.rst
+++ b/libc/docs/math/index.rst
@@ -160,7 +160,7 @@ Basic Operations
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | fmul             | N/A              |                 |                        | N/A                  |                        | 7.12.14.3              | F.10.11                    |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| frexp            | |check|          | |check|         | |check|                |                      | |check|                | 7.12.6.7               | F.10.3.7                   |
+| frexp            | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.6.7               | F.10.3.7                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | fromfp           | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.9.10              | F.10.6.10                  |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
@@ -168,23 +168,23 @@ Basic Operations
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | fsub             | N/A              |                 |                        | N/A                  |                        | 7.12.14.2              | F.10.11                    |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| ilogb            | |check|          | |check|         | |check|                |                      | |check|                | 7.12.6.8               | F.10.3.8                   |
+| ilogb            | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.6.8               | F.10.3.8                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| ldexp            | |check|          | |check|         | |check|                |                      | |check|                | 7.12.6.9               | F.10.3.9                   |
+| ldexp            | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.6.9               | F.10.3.9                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| llogb            | |check|          | |check|         | |check|                |                      | |check|                | 7.12.6.10              | F.10.3.10                  |
+| llogb            | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.6.10              | F.10.3.10                  |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | llrint           | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.9.5               | F.10.6.5                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | llround          | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.9.7               | F.10.6.7                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| logb             | |check|          | |check|         | |check|                |                      | |check|                | 7.12.6.17              | F.10.3.17                  |
+| logb             | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.6.17              | F.10.3.17                  |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | lrint            | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.9.5               | F.10.6.5                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | lround           | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.9.7               | F.10.6.7                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| modf             | |check|          | |check|         | |check|                |                      | |check|                | 7.12.6.18              | F.10.3.18                  |
+| modf             | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.6.18              | F.10.3.18                  |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | nan              | |check|          | |check|         | |check|                |                      | |check|                | 7.12.11.2              | F.10.8.2                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
diff --git a/libc/spec/spec.td b/libc/spec/spec.td
index 056a3143c5a71..7e1283e67fab2 100644
--- a/libc/spec/spec.td
+++ b/libc/spec/spec.td
@@ -115,6 +115,7 @@ def IntPtr : PtrType<IntType>;
 def RestrictedIntPtr : RestrictedPtrType<IntType>;
 def FloatPtr : PtrType<FloatType>;
 def DoublePtr : PtrType<DoubleType>;
+def Float16Ptr : PtrType<Float16Type>;
 def Float128Ptr : PtrType<Float128Type>;
 def UnsignedCharPtr : PtrType<UnsignedCharType>;
 
diff --git a/libc/spec/stdc.td b/libc/spec/stdc.td
index 9a436c8ae38d2..cbbcfb902e494 100644
--- a/libc/spec/stdc.td
+++ b/libc/spec/stdc.td
@@ -483,6 +483,7 @@ def StdC : StandardSpec<"stdc"> {
           FunctionSpec<"frexp", RetValSpec<DoubleType>, [ArgSpec<DoubleType>, ArgSpec<IntPtr>]>,
           FunctionSpec<"frexpf", RetValSpec<FloatType>, [ArgSpec<FloatType>, ArgSpec<IntPtr>]>,
           FunctionSpec<"frexpl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>, ArgSpec<IntPtr>]>,
+          GuardedFunctionSpec<"frexpf16", RetValSpec<Float16Type>, [ArgSpec<Float16Type>, ArgSpec<IntPtr>], "LIBC_TYPES_HAS_FLOAT16">,
           GuardedFunctionSpec<"frexpf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>, ArgSpec<IntPtr>], "LIBC_TYPES_HAS_FLOAT128">,
 
           FunctionSpec<"fromfp", RetValSpec<DoubleType>, [ArgSpec<DoubleType>, ArgSpec<IntType>, ArgSpec<UnsignedIntType>]>,
@@ -515,16 +516,19 @@ def StdC : StandardSpec<"stdc"> {
           FunctionSpec<"ilogb", RetValSpec<IntType>, [ArgSpec<DoubleType>]>,
           FunctionSpec<"ilogbf", RetValSpec<IntType>, [ArgSpec<FloatType>]>,
           FunctionSpec<"ilogbl", RetValSpec<IntType>, [ArgSpec<LongDoubleType>]>,
+          GuardedFunctionSpec<"ilogbf16", RetValSpec<IntType>, [ArgSpec<Float16Type>], "LIBC_TYPES_HAS_FLOAT16">,
           GuardedFunctionSpec<"ilogbf128", RetValSpec<IntType>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
 
           FunctionSpec<"llogb", RetValSpec<LongType>, [ArgSpec<DoubleType>]>,
           FunctionSpec<"llogbf", RetValSpec<LongType>, [ArgSpec<FloatType>]>,
           FunctionSpec<"llogbl", RetValSpec<LongType>, [ArgSpec<LongDoubleType>]>,
+          GuardedFunctionSpec<"llogbf16", RetValSpec<LongType>, [ArgSpec<Float16Type>], "LIBC_TYPES_HAS_FLOAT16">,
           GuardedFunctionSpec<"llogbf128", RetValSpec<LongType>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
 
           FunctionSpec<"ldexp", RetValSpec<DoubleType>, [ArgSpec<DoubleType>, ArgSpec<IntType>]>,
           FunctionSpec<"ldexpf", RetValSpec<FloatType>, [ArgSpec<FloatType>, ArgSpec<IntType>]>,
           FunctionSpec<"ldexpl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>, ArgSpec<IntType>]>,
+          GuardedFunctionSpec<"ldexpf16", RetValSpec<Float16Type>, [ArgSpec<Float16Type>, ArgSpec<IntType>], "LIBC_TYPES_HAS_FLOAT16">,
           GuardedFunctionSpec<"ldexpf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>, ArgSpec<IntType>], "LIBC_TYPES_HAS_FLOAT128">,
 
           FunctionSpec<"log10", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,
@@ -542,11 +546,13 @@ def StdC : StandardSpec<"stdc"> {
           FunctionSpec<"logb", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,
           FunctionSpec<"logbf", RetValSpec<FloatType>, [ArgSpec<FloatType>]>,
           FunctionSpec<"logbl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>]>,
+          GuardedFunctionSpec<"logbf16", RetValSpec<Float16Type>, [ArgSpec<Float16Type>], "LIBC_TYPES_HAS_FLOAT16">,
           GuardedFunctionSpec<"logbf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
 
           FunctionSpec<"modf", RetValSpec<DoubleType>, [ArgSpec<DoubleType>, ArgSpec<DoublePtr>]>,
           FunctionSpec<"modff", RetValSpec<FloatType>, [ArgSpec<FloatType>, ArgSpec<FloatPtr>]>,
           FunctionSpec<"modfl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>, ArgSpec<LongDoublePtr>]>,
+          GuardedFunctionSpec<"modff16", RetValSpec<Float16Type>, [ArgSpec<Float16Type>, ArgSpec<Float16Ptr>], "LIBC_TYPES_HAS_FLOAT16">,
           GuardedFunctionSpec<"modff128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>, ArgSpec<Float128Ptr>], "LIBC_TYPES_HAS_FLOAT128">,
 
           FunctionSpec<"cos", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,
diff --git a/libc/src/__support/FPUtil/CMakeLists.txt b/libc/src/__support/FPUtil/CMakeLists.txt
index 01ca4254c7996..1744f8cf626f3 100644
--- a/libc/src/__support/FPUtil/CMakeLists.txt
+++ b/libc/src/__support/FPUtil/CMakeLists.txt
@@ -217,6 +217,7 @@ add_header_library(
     .nearest_integer_operations
     .normal_float
     libc.hdr.math_macros
+    libc.src.__support.CPP.algorithm
     libc.src.__support.CPP.bit
     libc.src.__support.CPP.limits
     libc.src.__support.CPP.type_traits
diff --git a/libc/src/__support/FPUtil/ManipulationFunctions.h b/libc/src/__support/FPUtil/ManipulationFunctions.h
index a289c2ef70467..09cfff31d64bb 100644
--- a/libc/src/__support/FPUtil/ManipulationFunctions.h
+++ b/libc/src/__support/FPUtil/ManipulationFunctions.h
@@ -16,6 +16,7 @@
 #include "rounding_mode.h"
 
 #include "hdr/math_macros.h"
+#include "src/__support/CPP/algorithm.h"
 #include "src/__support/CPP/bit.h"
 #include "src/__support/CPP/limits.h" // INT_MAX, INT_MIN
 #include "src/__support/CPP/type_traits.h"
@@ -102,7 +103,7 @@ intlogb(U x) {
     return IntLogbConstants<T>::T_MAX;
   }
 
-  DyadicFloat<FPBits<U>::STORAGE_LEN> normal(bits.get_val());
+  DyadicFloat<cpp::max(FPBits<U>::STORAGE_LEN, 32)> normal(bits.get_val());
   int exponent = normal.get_unbiased_exponent();
   // The C standard does not specify the return value when an exponent is
   // out of int range. However, XSI conformance required that INT_MAX or
@@ -138,7 +139,7 @@ LIBC_INLINE constexpr T logb(T x) {
     return FPBits<T>::inf().get_val();
   }
 
-  DyadicFloat<FPBits<T>::STORAGE_LEN> normal(bits.get_val());
+  DyadicFloat<cpp::max(FPBits<T>::STORAGE_LEN, 32)> normal(bits.get_val());
   return static_cast<T>(normal.get_unbiased_exponent());
 }
 
@@ -185,7 +186,7 @@ LIBC_INLINE constexpr T ldexp(T x, int exp) {
   }
 
   // For all other values, NormalFloat to T conversion handles it the right way.
-  DyadicFloat<FPBits<T>::STORAGE_LEN> normal(bits.get_val());
+  DyadicFloat<cpp::max(FPBits<T>::STORAGE_LEN, 32)> normal(bits.get_val());
   normal.exponent += exp;
   return static_cast<T>(normal);
 }
diff --git a/libc/src/__support/FPUtil/NormalFloat.h b/libc/src/__support/FPUtil/NormalFloat.h
index 8bc1fecd653bf..33529d5e9b80a 100644
--- a/libc/src/__support/FPUtil/NormalFloat.h
+++ b/libc/src/__support/FPUtil/NormalFloat.h
@@ -110,9 +110,11 @@ template <typename T> struct NormalFloat {
       if (shift <= FPBits<T>::FRACTION_LEN + 1) {
         // Generate a subnormal number. Might lead to loss of precision.
         // We round to nearest and round halfway cases to even.
-        const StorageType shift_out_mask = (StorageType(1) << shift) - 1;
+        const StorageType shift_out_mask =
+            static_cast<StorageType>(StorageType(1) << shift) - 1;
         const StorageType shift_out_value = mantissa & shift_out_mask;
-        const StorageType halfway_value = StorageType(1) << (shift - 1);
+        const StorageType halfway_value =
+            static_cast<StorageType>(StorageType(1) << (shift - 1));
         result.set_biased_exponent(0);
         result.set_mantissa(mantissa >> shift);
         StorageType new_mantissa = result.get_mantissa();
@@ -135,7 +137,8 @@ template <typename T> struct NormalFloat {
       }
     }
 
-    result.set_biased_exponent(exponent + FPBits<T>::EXP_BIAS);
+    result.set_biased_exponent(
+        static_cast<StorageType>(exponent + FPBits<T>::EXP_BIAS));
     result.set_mantissa(mantissa);
     return result.get_val();
   }
@@ -155,7 +158,7 @@ template <typename T> struct NormalFloat {
     // Normalize subnormal numbers.
     if (bits.is_subnormal()) {
       unsigned shift = evaluate_normalization_shift(bits.get_mantissa());
-      mantissa = StorageType(bits.get_mantissa()) << shift;
+      mantissa = static_cast<StorageType>(bits.get_mantissa() << shift);
       exponent = 1 - FPBits<T>::EXP_BIAS - shift;
     } else {
       exponent = bits.get_biased_exponent() - FPBits<T>::EXP_BIAS;
diff --git a/libc/src/__support/FPUtil/dyadic_float.h b/libc/src/__support/FPUtil/dyadic_float.h
index 12a69228d36c7..f1791f9da56ad 100644
--- a/libc/src/__support/FPUtil/dyadic_float.h
+++ b/libc/src/__support/FPUtil/dyadic_float.h
@@ -14,6 +14,7 @@
 #include "src/__support/CPP/type_traits.h"
 #include "src/__support/big_int.h"
 #include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
+#include "src/__support/macros/properties/types.h" // float16
 
 #include <stddef.h>
 
@@ -183,6 +184,10 @@ template <size_t Bits> struct DyadicFloat {
     return r;
   }
 
+  LIBC_INLINE explicit constexpr operator float16() const {
+    return static_cast<float16>(static_cast<float>(*this));
+  }
+
   LIBC_INLINE explicit constexpr operator MantissaType() const {
     if (mantissa.is_zero())
       return 0;
diff --git a/libc/src/math/CMakeLists.txt b/libc/src/math/CMakeLists.txt
index 7a349ddc53724..b6bbe815b0c90 100644
--- a/libc/src/math/CMakeLists.txt
+++ b/libc/src/math/CMakeLists.txt
@@ -188,6 +188,7 @@ add_math_entrypoint_object(fmodf128)
 add_math_entrypoint_object(frexp)
 add_math_entrypoint_object(frexpf)
 add_math_entrypoint_object(frexpl)
+add_math_entrypoint_object(frexpf16)
 add_math_entrypoint_object(frexpf128)
 
 add_math_entrypoint_object(fromfp)
@@ -208,16 +209,19 @@ add_math_entrypoint_object(hypotf)
 add_math_entrypoint_object(ilogb)
 add_math_entrypoint_object(ilogbf)
 add_math_entrypoint_object(ilogbl)
+add_math_entrypoint_object(ilogbf16)
 add_math_entrypoint_object(ilogbf128)
 
 add_math_entrypoint_object(llogb)
 add_math_entrypoint_object(llogbf)
 add_math_entrypoint_object(llogbl)
+add_math_entrypoint_object(llogbf16)
 add_math_entrypoint_object(llogbf128)
 
 add_math_entrypoint_object(ldexp)
 add_math_entrypoint_object(ldexpf)
 add_math_entrypoint_object(ldexpl)
+add_math_entrypoint_object(ldexpf16)
 add_math_entrypoint_object(ldexpf128)
 
 add_math_entrypoint_object(log10)
@@ -235,6 +239,7 @@ add_math_entrypoint_object(logf)
 add_math_entrypoint_object(logb)
 add_math_entrypoint_object(logbf)
 add_math_entrypoint_object(logbl)
+add_math_entrypoint_object(logbf16)
 add_math_entrypoint_object(logbf128)
 
 add_math_entrypoint_object(llrint)
@@ -264,6 +269,7 @@ add_math_entrypoint_object(lroundf128)
 add_math_entrypoint_object(modf)
 add_math_entrypoint_object(modff)
 add_math_entrypoint_object(modfl)
+add_math_entrypoint_object(modff16)
 add_math_entrypoint_object(modff128)
 
 add_math_entrypoint_object(nan)
diff --git a/libc/src/math/frexpf16.h b/libc/src/math/frexpf16.h
new file mode 100644
index 0000000000000..dc1898cc5f702
--- /dev/null
+++ b/libc/src/math/frexpf16.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for frexpf16 ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_MATH_FREXPF16_H
+#define LLVM_LIBC_SRC_MATH_FREXPF16_H
+
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE {
+
+float16 frexpf16(float16 x, int *exp);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_FREXPF16_H
diff --git a/libc/src/math/generic/CMakeLists.txt b/libc/src...
[truncated]

``````````

</details>


https://github.com/llvm/llvm-project/pull/94758


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