[libc][math]fadd implementation (#99694)

Summary:
- **[libc] math fadd**
- **[libc][math] implemented fadd**

Test Plan: 

Reviewers: 

Subscribers: 

Tasks: 

Tags: 


Differential Revision: https://phabricator.intern.facebook.com/D60251269

Author: aaryanshukla

libc/config/gpu/entrypoints.txt

@@ -266,6 +266,7 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.math.expm1f
     libc.src.math.fabs
     libc.src.math.fabsf
+    libc.src.math.fadd
     libc.src.math.fdim
     libc.src.math.fdimf
     libc.src.math.floor

libc/config/linux/aarch64/entrypoints.txt

@@ -370,6 +370,7 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.math.fabs
     libc.src.math.fabsf
     libc.src.math.fabsl
+    libc.src.math.fadd 
     libc.src.math.fdim
     libc.src.math.fdimf
     libc.src.math.fdiml

libc/config/linux/arm/entrypoints.txt

@@ -239,6 +239,7 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.math.fabs
     libc.src.math.fabsf
     libc.src.math.fabsl
+    libc.src.math.fadd 
     libc.src.math.fdim
     libc.src.math.fdimf
     libc.src.math.fdiml

libc/config/linux/riscv/entrypoints.txt

@@ -371,6 +371,7 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.math.fabs
     libc.src.math.fabsf
     libc.src.math.fabsl
+    libc.src.math.fadd 
     libc.src.math.fdim
     libc.src.math.fdimf
     libc.src.math.fdiml

libc/config/linux/x86_64/entrypoints.txt

@@ -396,6 +396,7 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.math.fabs
     libc.src.math.fabsf
     libc.src.math.fabsl
+    libc.src.math.fadd 
     libc.src.math.fdim
     libc.src.math.fdimf
     libc.src.math.fdiml

libc/config/windows/entrypoints.txt

@@ -144,6 +144,7 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.math.fabs
     libc.src.math.fabsf
     libc.src.math.fabsl
+    libc.src.math.fadd
     libc.src.math.fdim
     libc.src.math.fdimf
     libc.src.math.fdiml

libc/docs/math/index.rst

@@ -136,7 +136,7 @@ Basic Operations
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | fabs             | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.7.3               | F.10.4.3                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| fadd             | N/A              |                 |                        | N/A                  |                        | 7.12.14.1              | F.10.11                    |
+| fadd             | N/A              | |check|         | |check|                | N/A                  | |check|                | 7.12.14.1              | F.10.11                    |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | fdim             | |check|          | |check|         | |check|                | |check|              | |check|                | 7.12.12.1              | F.10.9.1                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+

libc/spec/stdc.td

@@ -402,6 +402,7 @@ def StdC : StandardSpec<"stdc"> {
           FunctionSpec<"fabsl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>]>,
           GuardedFunctionSpec<"fabsf16", RetValSpec<Float16Type>, [ArgSpec<Float16Type>], "LIBC_TYPES_HAS_FLOAT16">,
           GuardedFunctionSpec<"fabsf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
+          FunctionSpec<"fadd", RetValSpec<FloatType>, [ArgSpec<DoubleType>, ArgSpec<DoubleType>]>,
 
           FunctionSpec<"fdim", RetValSpec<DoubleType>, [ArgSpec<DoubleType>, ArgSpec<DoubleType>]>,
           FunctionSpec<"fdimf", RetValSpec<FloatType>, [ArgSpec<FloatType>, ArgSpec<FloatType>]>,

libc/src/math/CMakeLists.txt

@@ -141,6 +141,7 @@ add_math_entrypoint_object(fabsf)
 add_math_entrypoint_object(fabsl)
 add_math_entrypoint_object(fabsf16)
 add_math_entrypoint_object(fabsf128)
+add_math_entrypoint_object(fadd)
 
 add_math_entrypoint_object(fdim)
 add_math_entrypoint_object(fdimf)

libc/src/math/fadd.h

@@ -0,0 +1,20 @@
+//===-- Implementation of fadd 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/__support/macros/config.h"
+
+#ifndef LLVM_LIBC_SRC_MATH_FADD_H
+#define LLVM_LIBC_SRC_MATH_FADD_H
+
+namespace LIBC_NAMESPACE_DECL {
+
+float fadd(double x, double y);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_FADD_H

libc/src/math/generic/CMakeLists.txt

@@ -452,6 +452,18 @@ add_entrypoint_object(
     -O3
 )
 
+add_entrypoint_object(
+  fadd
+  SRCS
+    fadd.cpp
+  HDRS
+    ../fadd.h
+  DEPENDS
+    libc.src.__support.FPUtil.basic_operations
+  COMPILE_OPTIONS
+    -O3
+)
+
 add_entrypoint_object(
   trunc
   SRCS

libc/src/math/generic/fadd.cpp

@@ -0,0 +1,20 @@
+//===-- Implementation of fadd 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/fadd.h"
+#include "src/__support/FPUtil/generic/add_sub.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(float, fadd, (double x, double y)) {
+  return fputil::generic::add<float>(x, y);
+}
+
+} // namespace LIBC_NAMESPACE_DECL

libc/test/src/math/CMakeLists.txt

@@ -174,6 +174,20 @@ add_fp_unittest(
     libc.src.__support.FPUtil.fp_bits
 )
 
+add_fp_unittest(
+  fadd_test
+  NEED_MPFR
+  SUITE
+    libc-math-unittests
+  SRCS
+    fadd_test.cpp
+  HDRS
+    AddTest.h
+  DEPENDS
+    libc.src.math.fadd
+    libc.src.__support.FPUtil.basic_operations
+)
+
 add_fp_unittest(
   trunc_test
   NEED_MPFR

libc/test/src/math/fadd_test.cpp

@@ -0,0 +1,13 @@
+//===-- Unittests for fadd ----------------------------------------------===//
+//
+// 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 "AddTest.h"
+
+#include "src/math/fadd.h"
+
+LIST_ADD_TESTS(float, double, LIBC_NAMESPACE::fadd)

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

@@ -141,6 +141,20 @@ add_fp_unittest(
     libc.src.__support.FPUtil.fp_bits
 )
 
+add_fp_unittest(
+  fadd_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    fadd_test.cpp
+  HDRS
+    AddTest.h
+  DEPENDS
+    libc.src.math.fadd
+    libc.src.__support.FPUtil.basic_operations
+
+)
+
 add_fp_unittest(
   trunc_test
   SUITE

libc/test/src/math/smoke/fadd_test.cpp

@@ -0,0 +1,13 @@
+//===-- Unittests for fadd ----------------------------------------------===//
+//
+// 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 "AddTest.h"
+
+#include "src/math/fadd.h"
+
+LIST_ADD_TESTS(float, double, LIBC_NAMESPACE::fadd)