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FlandiniMichael Flanders
Flandini
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Michael Flanders
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[libc][math] Adds entrypoint and tests for nearbyintf128,scalbnf128 (#88443)
Closes #84689. Adding @lntue for review. I was curious about the implementation of `round_using_current_rounding_mode` used for the `nearbyint` functions. It has one of the rounding modes as unreachable ([here](https://github.com/llvm/llvm-project/blob/main/libc/src/__support/FPUtil/NearestIntegerOperations.h#L243)), and I was wondering if this was okay for the `nearbyint` functions. --------- Co-authored-by: Michael Flanders <[email protected]>
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‎libc/config/linux/aarch64/entrypoints.txt‎

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@@ -527,11 +527,13 @@ if(LIBC_TYPES_HAS_FLOAT128)
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libc.src.math.lroundf128
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libc.src.math.modff128
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libc.src.math.nanf128
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libc.src.math.nearbyintf128
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libc.src.math.nextafterf128
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libc.src.math.nextdownf128
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libc.src.math.nextupf128
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libc.src.math.rintf128
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libc.src.math.roundf128
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libc.src.math.scalbnf128
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libc.src.math.sqrtf128
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libc.src.math.truncf128
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libc.src.math.ufromfpf128

‎libc/config/linux/riscv/entrypoints.txt‎

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@@ -535,11 +535,13 @@ if(LIBC_TYPES_HAS_FLOAT128)
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libc.src.math.lroundf128
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libc.src.math.modff128
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libc.src.math.nanf128
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libc.src.math.nearbyintf128
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libc.src.math.nextafterf128
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libc.src.math.nextdownf128
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libc.src.math.nextupf128
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libc.src.math.rintf128
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libc.src.math.roundf128
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libc.src.math.scalbnf128
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libc.src.math.sqrtf128
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libc.src.math.truncf128
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libc.src.math.ufromfpf128

‎libc/config/linux/x86_64/entrypoints.txt‎

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@@ -560,12 +560,14 @@ if(LIBC_TYPES_HAS_FLOAT128)
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libc.src.math.lroundf128
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libc.src.math.modff128
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libc.src.math.nanf128
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libc.src.math.nearbyintf128
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libc.src.math.nextafterf128
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libc.src.math.nextdownf128
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libc.src.math.nextupf128
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libc.src.math.rintf128
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libc.src.math.roundevenf128
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libc.src.math.roundf128
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libc.src.math.scalbnf128
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libc.src.math.sqrtf128
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libc.src.math.truncf128
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libc.src.math.ufromfpf128

‎libc/docs/math/index.rst‎

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@@ -188,7 +188,7 @@ Basic Operations
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+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
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| nan | |check| | |check| | |check| | | |check| | 7.12.11.2 | F.10.8.2 |
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+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
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| nearbyint | |check| | |check| | |check| | | | 7.12.9.3 | F.10.6.3 |
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| nearbyint | |check| | |check| | |check| | | |check| | 7.12.9.3 | F.10.6.3 |
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+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
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| nextafter | |check| | |check| | |check| | | |check| | 7.12.11.3 | F.10.8.3 |
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+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
@@ -208,7 +208,7 @@ Basic Operations
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+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
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| roundeven | |check| | |check| | |check| | | |check| | 7.12.9.8 | F.10.6.8 |
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+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
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| scalbn | |check| | |check| | |check| | | | 7.12.6.19 | F.10.3.19 |
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| scalbn | |check| | |check| | |check| | | |check| | 7.12.6.19 | F.10.3.19 |
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+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
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| trunc | |check| | |check| | |check| | | |check| | 7.12.9.9 | F.10.6.9 |
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+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+

‎libc/spec/stdc.td‎

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@@ -604,6 +604,7 @@ def StdC : StandardSpec<"stdc"> {
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FunctionSpec<"nearbyint", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,
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FunctionSpec<"nearbyintf", RetValSpec<FloatType>, [ArgSpec<FloatType>]>,
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FunctionSpec<"nearbyintl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>]>,
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GuardedFunctionSpec<"nearbyintf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
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FunctionSpec<"nextafterf", RetValSpec<FloatType>, [ArgSpec<FloatType>, ArgSpec<FloatType>]>,
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FunctionSpec<"nextafter", RetValSpec<DoubleType>, [ArgSpec<DoubleType>, ArgSpec<DoubleType>]>,
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FunctionSpec<"scalbn", RetValSpec<DoubleType>, [ArgSpec<DoubleType>, ArgSpec<IntType>]>,
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FunctionSpec<"scalbnf", RetValSpec<FloatType>, [ArgSpec<FloatType>, ArgSpec<IntType>]>,
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FunctionSpec<"scalbnl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>, ArgSpec<IntType>]>,
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GuardedFunctionSpec<"scalbnf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>, ArgSpec<IntType>], "LIBC_TYPES_HAS_FLOAT128">,
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FunctionSpec<"nanf", RetValSpec<FloatType>, [ArgSpec<ConstCharPtr>]>,
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FunctionSpec<"nan", RetValSpec<DoubleType>, [ArgSpec<ConstCharPtr>]>,

‎libc/src/math/CMakeLists.txt‎

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@@ -252,6 +252,7 @@ add_math_entrypoint_object(nanf128)
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add_math_entrypoint_object(nearbyint)
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add_math_entrypoint_object(nearbyintf)
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add_math_entrypoint_object(nearbyintl)
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add_math_entrypoint_object(nearbyintf128)
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add_math_entrypoint_object(nextafter)
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add_math_entrypoint_object(nextafterf)
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add_math_entrypoint_object(scalbn)
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add_math_entrypoint_object(scalbnf)
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add_math_entrypoint_object(scalbnl)
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add_math_entrypoint_object(scalbnf128)
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add_math_entrypoint_object(sincos)
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add_math_entrypoint_object(sincosf)

‎libc/src/math/generic/CMakeLists.txt‎

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@@ -704,7 +704,7 @@ add_entrypoint_object(
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DEPENDS
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libc.src.__support.FPUtil.nearest_integer_operations
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COMPILE_OPTIONS
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-O2
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-O3
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)
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add_entrypoint_object(
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libc.src.__support.FPUtil.nearest_integer_operations
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COMPILE_OPTIONS
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)
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add_entrypoint_object(
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libc.src.__support.FPUtil.nearest_integer_operations
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COMPILE_OPTIONS
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-O2
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-O3
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)
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add_entrypoint_object(
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nearbyintf128
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SRCS
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nearbyintf128.cpp
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HDRS
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../nearbyintf128.h
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DEPENDS
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libc.src.__support.macros.properties.types
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libc.src.__support.FPUtil.nearest_integer_operations
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COMPILE_OPTIONS
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-O3
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)
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add_object_library(
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-O3
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)
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add_entrypoint_object(
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scalbnf128
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SRCS
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scalbnf128.cpp
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HDRS
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../scalbnf128.h
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DEPENDS
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libc.src.__support.macros.properties.types
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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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fmaf
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SRCS

‎libc/src/math/generic/nearbyintf128.cpp‎

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//===-- Implementation of nearbyintf128 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/nearbyintf128.h"
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#include "src/__support/FPUtil/NearestIntegerOperations.h"
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#include "src/__support/common.h"
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namespace LIBC_NAMESPACE {
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LLVM_LIBC_FUNCTION(float128, nearbyintf128, (float128 x)) {
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return fputil::round_using_current_rounding_mode(x);
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}
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} // namespace LIBC_NAMESPACE

‎libc/src/math/generic/scalbnf128.cpp‎

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//===-- Implementation of scalbnf128 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/scalbnf128.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(float128, scalbnf128, (float128 x, int n)) {
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// TODO: should be switched to use `FLT_RADIX` in hdr/float_macros.h" instead
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// see: https://github.com/llvm/llvm-project/issues/90496
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#if !defined(__FLT_RADIX__)
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#error __FLT_RADIX__ undefined.
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#elif __FLT_RADIX__ != 2
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#error __FLT_RADIX__!=2, unimplemented.
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#else
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return fputil::ldexp(x, n);
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#endif
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}
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} // namespace LIBC_NAMESPACE

‎libc/src/math/nearbyintf128.h‎

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//===-- Implementation header for nearbyintf128 -----------------*- 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_NEARBYINTF128_H
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#define LLVM_LIBC_SRC_MATH_NEARBYINTF128_H
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#include "src/__support/macros/properties/types.h"
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namespace LIBC_NAMESPACE {
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float128 nearbyintf128(float128 x);
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} // namespace LIBC_NAMESPACE
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#endif // LLVM_LIBC_SRC_MATH_NEARBYINTF128_H

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