[libc][math][c23] Implement fminf16 function

Author: HendrikHuebner

libc/config/linux/aarch64/entrypoints.txt

@@ -501,6 +501,7 @@ if(LIBC_TYPES_HAS_FLOAT16)
     # math.h C23 _Float16 entrypoints
     libc.src.math.fabsf16
     libc.src.math.fmaxf16
+    libc.src.math.fminf16
   )
 endif()
 

libc/config/linux/x86_64/entrypoints.txt

@@ -534,6 +534,7 @@ if(LIBC_TYPES_HAS_FLOAT16)
     # math.h C23 _Float16 entrypoints
     libc.src.math.fabsf16
     libc.src.math.fmaxf16
+    libc.src.math.fminf16
   )
 endif()
 

libc/spec/stdc.td

@@ -412,6 +412,7 @@ def StdC : StandardSpec<"stdc"> {
           FunctionSpec<"fminf", RetValSpec<FloatType>, [ArgSpec<FloatType>, ArgSpec<FloatType>]>,
           FunctionSpec<"fminl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>, ArgSpec<LongDoubleType>]>,
           GuardedFunctionSpec<"fminf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>, ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
+          GuardedFunctionSpec<"fminf16", RetValSpec<Float16Type>, [ArgSpec<Float16Type>, ArgSpec<Float16Type>], "LIBC_TYPES_HAS_FLOAT16">,
 
           FunctionSpec<"fmax", RetValSpec<DoubleType>, [ArgSpec<DoubleType>, ArgSpec<DoubleType>]>,
           FunctionSpec<"fmaxf", RetValSpec<FloatType>, [ArgSpec<FloatType>, ArgSpec<FloatType>]>,

libc/src/math/CMakeLists.txt

@@ -125,6 +125,7 @@ add_math_entrypoint_object(fmin)
 add_math_entrypoint_object(fminf)
 add_math_entrypoint_object(fminl)
 add_math_entrypoint_object(fminf128)
+add_math_entrypoint_object(fminf16)
 
 add_math_entrypoint_object(fmaximum)
 add_math_entrypoint_object(fmaximumf)

libc/src/math/fmaxf16.h

@@ -1,4 +1,4 @@
-//===-- Implementation header for fmaxf16 -------------------------*- C++ -*-===//
+//===-- Implementation header for fmaxf16 -----------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

libc/src/math/fminf16.h

@@ -0,0 +1,20 @@
+//===-- Implementation header for fminf16 ----------------------*- 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_FMINF16_H
+#define LLVM_LIBC_SRC_MATH_FMINF16_H
+
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE {
+
+float16 fminf16(float16 x, float16 y);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_FMINF16_H

libc/src/math/generic/CMakeLists.txt

@@ -1612,6 +1612,20 @@ add_entrypoint_object(
     -O3
 )
 
+add_entrypoint_object(
+  fminf16
+  SRCS
+    fminf16.cpp
+  HDRS
+    ../fminf16.h
+  DEPENDS
+    libc.src.__support.macros.properties.types
+    libc.src.__support.FPUtil.basic_operations
+  COMPILE_OPTIONS
+    -O3
+)
+
+
 add_entrypoint_object(
   fmax
   SRCS

libc/src/math/generic/fmaxf16.cpp

@@ -1,4 +1,4 @@
-//===-- Unittest of fmaxf16 function ----------------------------------===//
+//===-- Unittest of fmaxf16 function --------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

libc/src/math/generic/fminf16.cpp

@@ -0,0 +1,19 @@
+//===-- Implementation of fminf16 function --------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/math/fminf16.h"
+#include "src/__support/FPUtil/BasicOperations.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(float16, fminf16, (float16 x, float16 y)) {
+  return fputil::fmin(x, y);
+}
+
+} // namespace LIBC_NAMESPACE

libc/test/src/math/smoke/CMakeLists.txt

@@ -1506,6 +1506,19 @@ add_fp_unittest(
     libc.src.__support.FPUtil.fp_bits
 )
 
+add_fp_unittest(
+  fminf16_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    fminf16_test.cpp
+  HDRS
+    FMinTest.h
+  DEPENDS
+    libc.src.math.fminf16
+    libc.src.__support.FPUtil.fp_bits
+)
+
 add_fp_unittest(
   fmaxf_test
   SUITE