[libc] Add implementations of lround[f|l] and llround[f|l].

A new function to MPFRWrapper has been added, which is used to set up
the unit tests.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D93007

Author: Siva Chandra Reddy

libc/config/linux/x86_64/entrypoints.txt

@@ -122,9 +122,15 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.math.ldexp
     libc.src.math.ldexpf
     libc.src.math.ldexpl
+    libc.src.math.llround
+    libc.src.math.llroundf
+    libc.src.math.llroundl
     libc.src.math.logb
     libc.src.math.logbf
     libc.src.math.logbl
+    libc.src.math.lround
+    libc.src.math.lroundf
+    libc.src.math.lroundl
     libc.src.math.modf
     libc.src.math.modff
     libc.src.math.modfl

libc/spec/spec.td

@@ -39,11 +39,11 @@ class RestrictedPtrType<Type type> : Type {
 def VarArgType : Type {}
 def VoidType : NamedType<"void">;
 def IntType : NamedType<"int">;
+def LongType : NamedType<"long">;
+def LongLongType : NamedType<"long long">;
 def FloatType : NamedType<"float">;
 def DoubleType : NamedType<"double">;
 def LongDoubleType : NamedType<"long double">;
-def LongLongType : NamedType<"long long">;
-def LongType : NamedType<"long">;
 def CharType : NamedType<"char">;
 
 // Common types

libc/spec/stdc.td

@@ -363,6 +363,14 @@ def StdC : StandardSpec<"stdc"> {
           FunctionSpec<"roundf", RetValSpec<FloatType>, [ArgSpec<FloatType>]>,
           FunctionSpec<"roundl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>]>,
 
+          FunctionSpec<"lround", RetValSpec<LongType>, [ArgSpec<DoubleType>]>,
+          FunctionSpec<"lroundf", RetValSpec<LongType>, [ArgSpec<FloatType>]>,
+          FunctionSpec<"lroundl", RetValSpec<LongType>, [ArgSpec<LongDoubleType>]>,
+
+          FunctionSpec<"llround", RetValSpec<LongLongType>, [ArgSpec<DoubleType>]>,
+          FunctionSpec<"llroundf", RetValSpec<LongLongType>, [ArgSpec<FloatType>]>,
+          FunctionSpec<"llroundl", RetValSpec<LongLongType>, [ArgSpec<LongDoubleType>]>,
+
           FunctionSpec<"sqrt", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,
           FunctionSpec<"sqrtf", RetValSpec<FloatType>, [ArgSpec<FloatType>]>,
           FunctionSpec<"sqrtl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>]>,

libc/src/math/CMakeLists.txt

@@ -236,6 +236,78 @@ add_entrypoint_object(
     -O2
 )
 
+add_entrypoint_object(
+  lround
+  SRCS
+    lround.cpp
+  HDRS
+    lround.h
+  DEPENDS
+    libc.utils.FPUtil.fputil
+  COMPILE_OPTIONS
+    -O2
+)
+
+add_entrypoint_object(
+  lroundf
+  SRCS
+    lroundf.cpp
+  HDRS
+    lroundf.h
+  DEPENDS
+    libc.utils.FPUtil.fputil
+  COMPILE_OPTIONS
+    -O2
+)
+
+add_entrypoint_object(
+  lroundl
+  SRCS
+    lroundl.cpp
+  HDRS
+    lroundl.h
+  DEPENDS
+    libc.utils.FPUtil.fputil
+  COMPILE_OPTIONS
+    -O2
+)
+
+add_entrypoint_object(
+  llround
+  SRCS
+    llround.cpp
+  HDRS
+    llround.h
+  DEPENDS
+    libc.utils.FPUtil.fputil
+  COMPILE_OPTIONS
+    -O2
+)
+
+add_entrypoint_object(
+  llroundf
+  SRCS
+    llroundf.cpp
+  HDRS
+    llroundf.h
+  DEPENDS
+    libc.utils.FPUtil.fputil
+  COMPILE_OPTIONS
+    -O2
+)
+
+add_entrypoint_object(
+  llroundl
+  SRCS
+    llroundl.cpp
+  HDRS
+    llroundl.h
+  DEPENDS
+    libc.utils.FPUtil.fputil
+  COMPILE_OPTIONS
+    -O2
+)
+
 add_object_library(
   exp_utils
   HDRS

libc/src/math/llround.cpp

@@ -0,0 +1,18 @@
+//===-- Implementation of llround 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/common.h"
+#include "utils/FPUtil/NearestIntegerOperations.h"
+
+namespace __llvm_libc {
+
+long long LLVM_LIBC_ENTRYPOINT(llround)(double x) {
+  return fputil::roundToSignedInteger<double, long long>(x);
+}
+
+} // namespace __llvm_libc

libc/src/math/llround.h

@@ -0,0 +1,18 @@
+//===-- Implementation header for llround -----------------------*- 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_LLROUND_H
+#define LLVM_LIBC_SRC_MATH_LLROUND_H
+
+namespace __llvm_libc {
+
+long long llround(double x);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_MATH_LLROUND_H

libc/src/math/llroundf.cpp

@@ -0,0 +1,18 @@
+//===-- Implementation of llroundf 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/common.h"
+#include "utils/FPUtil/NearestIntegerOperations.h"
+
+namespace __llvm_libc {
+
+long long LLVM_LIBC_ENTRYPOINT(llroundf)(float x) {
+  return fputil::roundToSignedInteger<float, long long>(x);
+}
+
+} // namespace __llvm_libc

libc/src/math/llroundf.h

@@ -0,0 +1,18 @@
+//===-- Implementation header for llroundf ----------------------*- 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_LLROUNDF_H
+#define LLVM_LIBC_SRC_MATH_LLROUNDF_H
+
+namespace __llvm_libc {
+
+long long llroundf(float x);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_MATH_LLROUNDF_H

libc/src/math/llroundl.cpp

@@ -0,0 +1,18 @@
+//===-- Implementation of llroundl 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/common.h"
+#include "utils/FPUtil/NearestIntegerOperations.h"
+
+namespace __llvm_libc {
+
+long long LLVM_LIBC_ENTRYPOINT(llroundl)(long double x) {
+  return fputil::roundToSignedInteger<long double, long long>(x);
+}
+
+} // namespace __llvm_libc

libc/src/math/llroundl.h

@@ -0,0 +1,18 @@
+//===-- Implementation header for llroundl ----------------------*- 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_LLROUNDL_H
+#define LLVM_LIBC_SRC_MATH_LLROUNDL_H
+
+namespace __llvm_libc {
+
+long long llroundl(long double x);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_MATH_LLROUNDL_H

libc/src/math/lround.cpp

@@ -0,0 +1,18 @@
+//===-- Implementation of lround 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/common.h"
+#include "utils/FPUtil/NearestIntegerOperations.h"
+
+namespace __llvm_libc {
+
+long LLVM_LIBC_ENTRYPOINT(lround)(double x) {
+  return fputil::roundToSignedInteger<double, long>(x);
+}
+
+} // namespace __llvm_libc

libc/src/math/lround.h

@@ -0,0 +1,18 @@
+//===-- Implementation header for lround ------------------------*- 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_LROUND_H
+#define LLVM_LIBC_SRC_MATH_LROUND_H
+
+namespace __llvm_libc {
+
+long lround(double x);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_MATH_LROUND_H

libc/src/math/lroundf.cpp

@@ -0,0 +1,18 @@
+//===-- Implementation of lroundf 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/common.h"
+#include "utils/FPUtil/NearestIntegerOperations.h"
+
+namespace __llvm_libc {
+
+long LLVM_LIBC_ENTRYPOINT(lroundf)(float x) {
+  return fputil::roundToSignedInteger<float, long>(x);
+}
+
+} // namespace __llvm_libc

libc/src/math/lroundf.h

@@ -0,0 +1,18 @@
+//===-- Implementation header for lroundf -----------------------*- 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_LROUNDF_H
+#define LLVM_LIBC_SRC_MATH_LROUNDF_H
+
+namespace __llvm_libc {
+
+long lroundf(float x);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_MATH_LROUNDF_H

libc/src/math/lroundl.cpp

@@ -0,0 +1,18 @@
+//===-- Implementation of lroundl 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/common.h"
+#include "utils/FPUtil/NearestIntegerOperations.h"
+
+namespace __llvm_libc {
+
+long LLVM_LIBC_ENTRYPOINT(lroundl)(long double x) {
+  return fputil::roundToSignedInteger<long double, long>(x);
+}
+
+} // namespace __llvm_libc

libc/src/math/lroundl.h

@@ -0,0 +1,18 @@
+//===-- Implementation header for lroundl -----------------------*- 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_LROUNDL_H
+#define LLVM_LIBC_SRC_MATH_LROUNDL_H
+
+namespace __llvm_libc {
+
+long lroundl(long double x);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_MATH_LROUNDL_H