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[libc][math][c23] Add nextupl and nextdownl functions (#85484)
Fixes #85283. cc @lntue
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15 files changed

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‎libc/config/linux/x86_64/entrypoints.txt‎

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@@ -431,8 +431,10 @@ set(TARGET_LIBM_ENTRYPOINTS
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libc.src.math.nexttowardl
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libc.src.math.nextdown
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libc.src.math.nextdownf
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libc.src.math.nextdownl
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libc.src.math.nextup
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libc.src.math.nextupf
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libc.src.math.nextupl
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libc.src.math.powf
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libc.src.math.remainderf
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libc.src.math.remainder

‎libc/docs/math/index.rst‎

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@@ -275,12 +275,28 @@ Basic Operations
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+--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
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| nextafterf128| |check| | |check| | | |check| | | | | | | | | |
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+--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
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| nextdown | |check| | | | | | | | | | | | |
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+--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
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| nextdownf | |check| | | | | | | | | | | | |
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+--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
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| nextdownl | |check| | | | | | | | | | | | |
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+--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
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| nextdownf128 | |check| | | | | | | | | | | | |
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+--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
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| nexttoward | |check| | |check| | |check| | |check| | |check| | | | |check| | |check| | |check| | | |
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+--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
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| nexttowardf | |check| | |check| | |check| | |check| | |check| | | | |check| | |check| | |check| | | |
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+--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
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| nexttowardl | |check| | |check| | |check| | |check| | |check| | | | |check| | |check| | |check| | | |
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+--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
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| nextup | |check| | | | | | | | | | | | |
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+--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
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| nextupf | |check| | | | | | | | | | | | |
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+--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
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| nextupl | |check| | | | | | | | | | | | |
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+--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
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| nextupf128 | |check| | | | | | | | | | | | |
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+--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
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| remainder | |check| | |check| | |check| | |check| | |check| | | | |check| | |check| | |check| | | |
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+--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
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| remainderf | |check| | |check| | |check| | |check| | |check| | | | |check| | |check| | |check| | | |

‎libc/spec/stdc.td‎

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@@ -538,10 +538,12 @@ def StdC : StandardSpec<"stdc"> {
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FunctionSpec<"nextdown", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,
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FunctionSpec<"nextdownf", RetValSpec<FloatType>, [ArgSpec<FloatType>]>,
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FunctionSpec<"nextdownl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>]>,
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GuardedFunctionSpec<"nextdownf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
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FunctionSpec<"nextup", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,
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FunctionSpec<"nextupf", RetValSpec<FloatType>, [ArgSpec<FloatType>]>,
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FunctionSpec<"nextupl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>]>,
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GuardedFunctionSpec<"nextupf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
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FunctionSpec<"powf", RetValSpec<FloatType>, [ArgSpec<FloatType>, ArgSpec<FloatType>]>,

‎libc/src/__support/FPUtil/ManipulationFunctions.h‎

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@@ -259,6 +259,7 @@ LIBC_INLINE constexpr T nextupdown(T x) {
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#ifdef LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80
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#include "x86_64/NextAfterLongDouble.h"
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#include "x86_64/NextUpDownLongDouble.h"
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#endif // LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80
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#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_MANIPULATIONFUNCTIONS_H

‎libc/src/__support/FPUtil/x86_64/NextUpDownLongDouble.h‎

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//===-- nextupdown implementation for x86 long double numbers ---*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_NEXTUPDOWNLONGDOUBLE_H
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#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_NEXTUPDOWNLONGDOUBLE_H
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#include "src/__support/FPUtil/FPBits.h"
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#include "src/__support/macros/attributes.h"
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#include "src/__support/macros/properties/architectures.h"
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#if !defined(LIBC_TARGET_ARCH_IS_X86)
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#error "Invalid include"
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#endif
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namespace LIBC_NAMESPACE::fputil {
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template <bool IsDown>
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LIBC_INLINE constexpr long double nextupdown(long double x) {
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constexpr Sign sign = IsDown ? Sign::NEG : Sign::POS;
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using FPBits_t = FPBits<long double>;
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FPBits_t xbits(x);
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if (xbits.is_nan() || xbits == FPBits_t::max_normal(sign) ||
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xbits == FPBits_t::inf(sign))
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return x;
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if (x == 0.0l)
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return FPBits_t::min_subnormal(sign).get_val();
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using StorageType = typename FPBits_t::StorageType;
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if (xbits.sign() == sign) {
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if (xbits.get_mantissa() == FPBits_t::FRACTION_MASK) {
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xbits.set_mantissa(0);
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xbits.set_biased_exponent(xbits.get_biased_exponent() + 1);
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} else {
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xbits = FPBits_t(StorageType(xbits.uintval() + 1));
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}
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return xbits.get_val();
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}
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if (xbits.get_mantissa() == 0) {
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xbits.set_mantissa(FPBits_t::FRACTION_MASK);
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xbits.set_biased_exponent(xbits.get_biased_exponent() - 1);
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} else {
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xbits = FPBits_t(StorageType(xbits.uintval() - 1));
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}
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return xbits.get_val();
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}
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} // namespace LIBC_NAMESPACE::fputil
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#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_NEXTUPDOWNLONGDOUBLE_H

‎libc/src/math/CMakeLists.txt‎

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@@ -207,10 +207,12 @@ add_math_entrypoint_object(nexttowardl)
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add_math_entrypoint_object(nextdown)
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add_math_entrypoint_object(nextdownf)
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add_math_entrypoint_object(nextdownl)
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add_math_entrypoint_object(nextdownf128)
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add_math_entrypoint_object(nextup)
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add_math_entrypoint_object(nextupf)
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add_math_entrypoint_object(nextupl)
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add_math_entrypoint_object(nextupf128)
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add_math_entrypoint_object(pow)

‎libc/src/math/generic/CMakeLists.txt‎

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@@ -1890,6 +1890,18 @@ add_entrypoint_object(
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-O3
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)
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add_entrypoint_object(
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nextdownl
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SRCS
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nextdownl.cpp
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HDRS
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../nextdownl.h
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DEPENDS
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libc.src.__support.FPUtil.manipulation_functions
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COMPILE_OPTIONS
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-O3
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)
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add_entrypoint_object(
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nextdownf
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SRCS
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-O3
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)
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add_entrypoint_object(
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nextupl
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SRCS
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nextupl.cpp
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HDRS
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../nextupl.h
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DEPENDS
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libc.src.__support.FPUtil.manipulation_functions
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COMPILE_OPTIONS
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-O3
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)
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add_entrypoint_object(
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nextupf
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SRCS

‎libc/src/math/generic/nextdownl.cpp‎

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//===-- Implementation of nextdownl function ------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/math/nextdownl.h"
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#include "src/__support/FPUtil/ManipulationFunctions.h"
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#include "src/__support/common.h"
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namespace LIBC_NAMESPACE {
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LLVM_LIBC_FUNCTION(long double, nextdownl, (long double x)) {
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return fputil::nextupdown</*IsDown=*/true>(x);
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}
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} // namespace LIBC_NAMESPACE

‎libc/src/math/generic/nextupl.cpp‎

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//===-- Implementation of nextupl function --------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/math/nextupl.h"
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#include "src/__support/FPUtil/ManipulationFunctions.h"
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#include "src/__support/common.h"
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namespace LIBC_NAMESPACE {
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LLVM_LIBC_FUNCTION(long double, nextupl, (long double x)) {
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return fputil::nextupdown</*IsDown=*/false>(x);
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}
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} // namespace LIBC_NAMESPACE

‎libc/src/math/nextdownl.h‎

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//===-- Implementation header for nextdownl ---------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_SRC_MATH_NEXTDOWNL_H
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#define LLVM_LIBC_SRC_MATH_NEXTDOWNL_H
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namespace LIBC_NAMESPACE {
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long double nextdownl(long double x);
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} // namespace LIBC_NAMESPACE
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#endif // LLVM_LIBC_SRC_MATH_NEXTDOWNL_H

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