[llvm] [libc] [libc][NFC] Refactor FPBits and remove LongDoubleBits specialization (PR #78192)
via llvm-commits
llvm-commits at lists.llvm.org
Mon Jan 15 09:03:01 PST 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-libc
Author: Guillaume Chatelet (gchatelet)
<details>
<summary>Changes</summary>
---
Patch is 41.06 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/78192.diff
8 Files Affected:
- (modified) libc/src/__support/FPUtil/FPBits.h (+284-90)
- (modified) libc/src/__support/FPUtil/generic/sqrt_80_bit_long_double.h (+1-1)
- (removed) libc/src/__support/FPUtil/x86_64/LongDoubleBits.h (-179)
- (modified) libc/src/__support/FPUtil/x86_64/NextAfterLongDouble.h (+4-4)
- (modified) libc/test/src/__support/FPUtil/fpbits_test.cpp (+216)
- (modified) libc/test/utils/FPUtil/x86_long_double_test.cpp (+6-6)
- (modified) utils/bazel/llvm-project-overlay/libc/BUILD.bazel (-1)
- (added) utils/bazel/llvm-project-overlay/libc/test/src/__support/FPUtil/BUILD.bazel (+42)
``````````diff
diff --git a/libc/src/__support/FPUtil/FPBits.h b/libc/src/__support/FPUtil/FPBits.h
index 93e32ba7cc9415b..58d63a7d01fb823 100644
--- a/libc/src/__support/FPUtil/FPBits.h
+++ b/libc/src/__support/FPUtil/FPBits.h
@@ -132,6 +132,70 @@ struct FPRepBase : public internal::FPLayout<fp_type> {
static_assert((SIG_MASK & EXP_MASK & SIGN_MASK) == 0, "masks disjoint");
static_assert((SIG_MASK | EXP_MASK | SIGN_MASK) == FP_MASK, "masks cover");
+protected:
+ enum class Exp : int32_t {
+ ZERO = 0,
+ // The exponent value for denormal numbers.
+ SUBNORMAL = -EXP_BIAS,
+ // The minimum exponent value for normal numbers.
+ MIN = SUBNORMAL + 1,
+ // The maximum exponent value for normal numbers.
+ MAX = EXP_BIAS,
+ // Special value all ones.
+ INF = MAX + 1,
+ // Aliases
+ BITS_ALL_ZEROES = SUBNORMAL,
+ BITS_ALL_ONES = INF,
+ };
+
+ enum class Sig : StorageType {
+ ZERO = 0,
+ ONE = 1,
+ MSB = StorageType(1) << (SIG_LEN - 1),
+ // Aliases
+ BITS_ALL_ZEROES = ZERO,
+ BITS_ALL_ONES = SIG_MASK,
+ };
+
+ template <typename T>
+ LIBC_INLINE static constexpr auto storage_cast(T value) {
+ return static_cast<StorageType>(value);
+ }
+
+ LIBC_INLINE friend constexpr Sig operator|(const Sig a, const Sig b) {
+ return Sig{storage_cast(storage_cast(a) | storage_cast(b))};
+ }
+ LIBC_INLINE friend constexpr Sig operator^(const Sig a, const Sig b) {
+ return Sig{storage_cast(storage_cast(a) ^ storage_cast(b))};
+ }
+ LIBC_INLINE friend constexpr Sig operator>>(const Sig a, int shift) {
+ return Sig{storage_cast(storage_cast(a) >> shift)};
+ }
+
+ LIBC_INLINE static constexpr StorageType encode(Exp exp) {
+ return storage_cast(static_cast<int32_t>(exp) + EXP_BIAS) << SIG_LEN;
+ }
+
+ LIBC_INLINE static constexpr StorageType encode(Sig value) {
+ return storage_cast(value) & SIG_MASK;
+ }
+
+ LIBC_INLINE static constexpr StorageType encode(Exp exp, Sig sig) {
+ return encode(exp) | encode(sig);
+ }
+
+ LIBC_INLINE static constexpr StorageType encode(bool sign, Exp exp, Sig sig) {
+ if (sign)
+ return SIGN_MASK | encode(exp, sig);
+ return encode(exp, sig);
+ }
+
+ LIBC_INLINE constexpr StorageType exp_bits() const { return bits & EXP_MASK; }
+ LIBC_INLINE constexpr StorageType sig_bits() const { return bits & SIG_MASK; }
+ LIBC_INLINE constexpr StorageType exp_sig_bits() const {
+ return bits & EXP_SIG_MASK;
+ }
+
private:
LIBC_INLINE static constexpr StorageType bit_at(int position) {
return StorageType(1) << position;
@@ -155,20 +219,6 @@ struct FPRepBase : public internal::FPLayout<fp_type> {
LIBC_INLINE_VAR static constexpr StorageType FRACTION_MASK =
mask_trailing_ones<StorageType, FRACTION_LEN>();
- // If a number x is a NAN, then it is a quiet NAN if:
- // QUIET_NAN_MASK & bits(x) != 0
- LIBC_INLINE_VAR static constexpr StorageType QUIET_NAN_MASK =
- fp_type == FPType::X86_Binary80
- ? bit_at(SIG_LEN - 1) | bit_at(SIG_LEN - 2) // 0b1100...
- : bit_at(SIG_LEN - 1); // 0b1000...
-
- // Mask to generate a default signaling NAN. Any NAN that is not
- // a quiet NAN is considered a signaling NAN.
- LIBC_INLINE_VAR static constexpr StorageType DEFAULT_SIGNALING_NAN =
- fp_type == FPType::X86_Binary80
- ? bit_at(SIG_LEN - 1) | bit_at(SIG_LEN - 3) // 0b1010...
- : bit_at(SIG_LEN - 2); // 0b0100...
-
// The floating point number representation as an unsigned integer.
StorageType bits = 0;
@@ -220,6 +270,9 @@ struct FPRepBase : public internal::FPLayout<fp_type> {
}
LIBC_INLINE constexpr StorageType uintval() const { return bits & FP_MASK; }
+ LIBC_INLINE constexpr StorageType set_uintval(StorageType value) {
+ return bits = (value & FP_MASK);
+ }
LIBC_INLINE constexpr bool is_zero() const {
return (bits & EXP_SIG_MASK) == 0;
@@ -241,6 +294,199 @@ template <FPType fp_type> struct FPRep : public FPRepBase<fp_type> {
using UP::FRACTION_LEN;
using UP::FRACTION_MASK;
using UP::MANTISSA_PRECISION;
+
+protected:
+ using typename UP::Exp;
+ using typename UP::Sig;
+ using UP::encode;
+ using UP::exp_bits;
+ using UP::exp_sig_bits;
+ using UP::sig_bits;
+
+public:
+ LIBC_INLINE constexpr bool is_nan() const {
+ return exp_sig_bits() > encode(Exp::BITS_ALL_ONES, Sig::BITS_ALL_ZEROES);
+ }
+ LIBC_INLINE constexpr bool is_quiet_nan() const {
+ return exp_sig_bits() >= encode(Exp::BITS_ALL_ONES, Sig::MSB);
+ }
+ LIBC_INLINE constexpr bool is_signaling_nan() const {
+ return is_nan() && !is_quiet_nan();
+ }
+ LIBC_INLINE constexpr bool is_inf() const {
+ return exp_sig_bits() == encode(Exp::BITS_ALL_ONES, Sig::BITS_ALL_ZEROES);
+ }
+ LIBC_INLINE constexpr bool is_zero() const {
+ return exp_sig_bits() == encode(Exp::BITS_ALL_ZEROES, Sig::BITS_ALL_ZEROES);
+ }
+ LIBC_INLINE constexpr bool is_finite() const {
+ return exp_bits() != encode(Exp::BITS_ALL_ONES);
+ }
+ LIBC_INLINE
+ constexpr bool is_subnormal() const {
+ return exp_bits() == encode(Exp::BITS_ALL_ZEROES);
+ }
+ LIBC_INLINE constexpr bool is_normal() const {
+ return is_finite() && !is_subnormal();
+ }
+
+ LIBC_INLINE static constexpr StorageType zero(bool sign = false) {
+ return encode(sign, Exp::BITS_ALL_ZEROES, Sig::BITS_ALL_ZEROES);
+ }
+ LIBC_INLINE static constexpr StorageType one(bool sign = false) {
+ return encode(sign, Exp::ZERO, Sig::BITS_ALL_ZEROES);
+ }
+ LIBC_INLINE static constexpr StorageType min_subnormal(bool sign = false) {
+ return encode(sign, Exp::BITS_ALL_ZEROES, Sig::ONE);
+ }
+ LIBC_INLINE static constexpr StorageType max_subnormal(bool sign = false) {
+ return encode(sign, Exp::BITS_ALL_ZEROES, Sig::BITS_ALL_ONES);
+ }
+ LIBC_INLINE static constexpr StorageType min_normal(bool sign = false) {
+ return encode(sign, Exp::MIN, Sig::BITS_ALL_ZEROES);
+ }
+ LIBC_INLINE static constexpr StorageType max_normal(bool sign = false) {
+ return encode(sign, Exp::MAX, Sig::BITS_ALL_ONES);
+ }
+ LIBC_INLINE static constexpr StorageType inf(bool sign = false) {
+ return encode(sign, Exp::BITS_ALL_ONES, Sig::BITS_ALL_ZEROES);
+ }
+ LIBC_INLINE static constexpr StorageType build_nan(bool sign = false,
+ StorageType v = 0) {
+ return encode(sign, Exp::BITS_ALL_ONES, (v ? Sig{v} : (Sig::MSB >> 1)));
+ }
+ LIBC_INLINE static constexpr StorageType build_quiet_nan(bool sign = false,
+ StorageType v = 0) {
+ return encode(sign, Exp::BITS_ALL_ONES, Sig::MSB | Sig{v});
+ }
+
+ // The function return mantissa with the implicit bit set iff the current
+ // value is a valid normal number.
+ LIBC_INLINE constexpr StorageType get_explicit_mantissa() {
+ if (is_subnormal())
+ return sig_bits();
+ return (StorageType(1) << UP::SIG_LEN) | sig_bits();
+ }
+};
+
+// Specialization for the X86 Extended Precision type.
+template <>
+struct FPRep<FPType::X86_Binary80> : public FPRepBase<FPType::X86_Binary80> {
+ using UP = FPRepBase<FPType::X86_Binary80>;
+ using typename UP::StorageType;
+ using UP::FRACTION_LEN;
+ using UP::FRACTION_MASK;
+ using UP::MANTISSA_PRECISION;
+
+protected:
+ using typename UP::Exp;
+ using typename UP::Sig;
+ using UP::encode;
+
+public:
+ // The x86 80 bit float represents the leading digit of the mantissa
+ // explicitly. This is the mask for that bit.
+ static constexpr StorageType EXPLICIT_BIT_MASK = StorageType(1)
+ << FRACTION_LEN;
+ // The X80 significand is made of an explicit bit and the fractional part.
+ static_assert((EXPLICIT_BIT_MASK & FRACTION_MASK) == 0,
+ "the explicit bit and the fractional part should not overlap");
+ static_assert((EXPLICIT_BIT_MASK | FRACTION_MASK) == SIG_MASK,
+ "the explicit bit and the fractional part should cover the "
+ "whole significand");
+
+ LIBC_INLINE constexpr bool is_nan() const {
+ // Most encoding forms from the table found in
+ // https://en.wikipedia.org/wiki/Extended_precision#x86_extended_precision_format
+ // are interpreted as NaN.
+ // More precisely :
+ // - Pseudo-Infinity
+ // - Pseudo Not a Number
+ // - Signalling Not a Number
+ // - Floating-point Indefinite
+ // - Quiet Not a Number
+ // - Unnormal
+ // This can be reduced to the following logic:
+ if (exp_bits() == encode(Exp::BITS_ALL_ONES))
+ return !is_inf();
+ if (exp_bits() != encode(Exp::BITS_ALL_ZEROES))
+ return (sig_bits() & encode(Sig::MSB)) == 0;
+ return false;
+ }
+ LIBC_INLINE constexpr bool is_quiet_nan() const {
+ return exp_sig_bits() >=
+ encode(Exp::BITS_ALL_ONES, Sig::MSB | (Sig::MSB >> 1));
+ }
+ LIBC_INLINE constexpr bool is_signaling_nan() const {
+ return is_nan() && !is_quiet_nan();
+ }
+ LIBC_INLINE constexpr bool is_inf() const {
+ return exp_sig_bits() == encode(Exp::BITS_ALL_ONES, Sig::MSB);
+ }
+ LIBC_INLINE constexpr bool is_zero() const {
+ return exp_sig_bits() == encode(Exp::BITS_ALL_ZEROES, Sig::BITS_ALL_ZEROES);
+ }
+ LIBC_INLINE constexpr bool is_finite() const {
+ return !is_inf() && !is_nan();
+ }
+ LIBC_INLINE
+ constexpr bool is_subnormal() const {
+ return exp_sig_bits() > encode(Exp::BITS_ALL_ZEROES, Sig::BITS_ALL_ZEROES);
+ }
+ LIBC_INLINE constexpr bool is_normal() const {
+ const auto exp = exp_bits();
+ if (exp == encode(Exp::BITS_ALL_ZEROES) ||
+ exp == encode(Exp::BITS_ALL_ONES))
+ return false;
+ return get_implicit_bit();
+ }
+
+ LIBC_INLINE static constexpr StorageType zero(bool sign = false) {
+ return encode(sign, Exp::BITS_ALL_ZEROES, Sig::BITS_ALL_ZEROES);
+ }
+ LIBC_INLINE static constexpr StorageType one(bool sign = false) {
+ return encode(sign, Exp::ZERO, Sig::MSB);
+ }
+ LIBC_INLINE static constexpr StorageType min_subnormal(bool sign = false) {
+ return encode(sign, Exp::BITS_ALL_ZEROES, Sig::ONE);
+ }
+ LIBC_INLINE static constexpr StorageType max_subnormal(bool sign = false) {
+ return encode(sign, Exp::BITS_ALL_ZEROES, Sig::BITS_ALL_ONES ^ Sig::MSB);
+ }
+ LIBC_INLINE static constexpr StorageType min_normal(bool sign = false) {
+ return encode(sign, Exp::MIN, Sig::MSB);
+ }
+ LIBC_INLINE static constexpr StorageType max_normal(bool sign = false) {
+ return encode(sign, Exp::MAX, Sig::BITS_ALL_ONES);
+ }
+ LIBC_INLINE static constexpr StorageType inf(bool sign = false) {
+ return encode(sign, Exp::BITS_ALL_ONES, Sig::MSB);
+ }
+ LIBC_INLINE static constexpr StorageType build_nan(bool sign = false,
+ StorageType v = 0) {
+ return encode(sign, Exp::BITS_ALL_ONES,
+ Sig::MSB | (v ? Sig{v} : (Sig::MSB >> 2)));
+ }
+ LIBC_INLINE static constexpr StorageType build_quiet_nan(bool sign = false,
+ StorageType v = 0) {
+ return encode(sign, Exp::BITS_ALL_ONES,
+ Sig::MSB | (Sig::MSB >> 1) | Sig{v});
+ }
+
+ LIBC_INLINE constexpr StorageType get_explicit_mantissa() const {
+ return sig_bits();
+ }
+
+ // The following functions are specific to this implementation.
+ // TODO: Remove if possible.
+ LIBC_INLINE constexpr bool get_implicit_bit() const {
+ return bits & EXPLICIT_BIT_MASK;
+ }
+
+ LIBC_INLINE constexpr void set_implicit_bit(bool implicitVal) {
+ if (get_implicit_bit() != implicitVal)
+ bits ^= EXPLICIT_BIT_MASK;
+ }
};
} // namespace internal
@@ -276,47 +522,29 @@ template <typename T> LIBC_INLINE static constexpr FPType get_fp_type() {
static_assert(cpp::always_false<UnqualT>, "Unsupported type");
}
-// A generic class to represent single precision, double precision, and quad
-// precision IEEE 754 floating point formats.
+// A generic class to represent floating point formats.
// On most platforms, the 'float' type corresponds to single precision floating
// point numbers, the 'double' type corresponds to double precision floating
// point numers, and the 'long double' type corresponds to the quad precision
// floating numbers. On x86 platforms however, the 'long double' type maps to
-// an x87 floating point format. This format is an IEEE 754 extension format.
-// It is handled as an explicit specialization of this class.
+// an x87 floating point format.
template <typename T> struct FPBits : public internal::FPRep<get_fp_type<T>()> {
static_assert(cpp::is_floating_point_v<T>,
"FPBits instantiated with invalid type.");
using UP = internal::FPRep<get_fp_type<T>()>;
-
-private:
- using UP::EXP_SIG_MASK;
- using UP::QUIET_NAN_MASK;
- using UP::SIG_LEN;
- using UP::SIG_MASK;
-
-public:
+ using Rep = UP;
using StorageType = typename UP::StorageType;
+
using UP::bits;
- using UP::EXP_BIAS;
using UP::EXP_LEN;
- using UP::EXP_MASK;
- using UP::EXP_MASK_SHIFT;
- using UP::FRACTION_LEN;
- using UP::FRACTION_MASK;
- using UP::SIGN_MASK;
- using UP::TOTAL_LEN;
using UP::UP;
- using UP::get_biased_exponent;
- using UP::is_zero;
// Constants.
static constexpr int MAX_BIASED_EXPONENT = (1 << EXP_LEN) - 1;
- static constexpr StorageType MIN_SUBNORMAL = StorageType(1);
- static constexpr StorageType MAX_SUBNORMAL = FRACTION_MASK;
- static constexpr StorageType MIN_NORMAL = (StorageType(1) << FRACTION_LEN);
- static constexpr StorageType MAX_NORMAL =
- (StorageType(MAX_BIASED_EXPONENT - 1) << SIG_LEN) | SIG_MASK;
+ static constexpr StorageType MIN_NORMAL = UP::min_normal(false);
+ static constexpr StorageType MAX_NORMAL = UP::max_normal(false);
+ static constexpr StorageType MIN_SUBNORMAL = UP::min_subnormal(false);
+ static constexpr StorageType MAX_SUBNORMAL = UP::max_subnormal(false);
// Constructors.
LIBC_INLINE constexpr FPBits() = default;
@@ -338,88 +566,56 @@ template <typename T> struct FPBits : public internal::FPRep<get_fp_type<T>()> {
LIBC_INLINE constexpr explicit operator T() const { return get_val(); }
- // The function return mantissa with the implicit bit set iff the current
- // value is a valid normal number.
- LIBC_INLINE constexpr StorageType get_explicit_mantissa() {
- return ((get_biased_exponent() > 0 && !is_inf_or_nan())
- ? (FRACTION_MASK + 1)
- : 0) |
- (FRACTION_MASK & bits);
- }
-
- LIBC_INLINE constexpr bool is_inf() const {
- return (bits & EXP_SIG_MASK) == EXP_MASK;
- }
-
- LIBC_INLINE constexpr bool is_nan() const {
- return (bits & EXP_SIG_MASK) > EXP_MASK;
- }
-
- LIBC_INLINE constexpr bool is_quiet_nan() const {
- return (bits & EXP_SIG_MASK) >= (EXP_MASK | QUIET_NAN_MASK);
- }
-
- LIBC_INLINE constexpr bool is_inf_or_nan() const {
- return (bits & EXP_MASK) == EXP_MASK;
- }
+ LIBC_INLINE constexpr bool is_inf_or_nan() const { return !UP::is_finite(); }
LIBC_INLINE constexpr FPBits abs() const {
- return FPBits(bits & EXP_SIG_MASK);
+ return FPBits(bits & UP::EXP_SIG_MASK);
}
// Methods below this are used by tests.
LIBC_INLINE static constexpr T zero(bool sign = false) {
- StorageType rep = (sign ? SIGN_MASK : StorageType(0)) // sign
- | 0 // exponent
- | 0; // mantissa
- return FPBits(rep).get_val();
+ return FPBits(UP::zero(sign)).get_val();
}
LIBC_INLINE static constexpr T neg_zero() { return zero(true); }
LIBC_INLINE static constexpr T inf(bool sign = false) {
- StorageType rep = (sign ? SIGN_MASK : StorageType(0)) // sign
- | EXP_MASK // exponent
- | 0; // mantissa
- return FPBits(rep).get_val();
+ return FPBits(UP::inf(sign)).get_val();
}
LIBC_INLINE static constexpr T neg_inf() { return inf(true); }
LIBC_INLINE static constexpr T min_normal() {
- return FPBits(MIN_NORMAL).get_val();
+ return FPBits(UP::min_normal(false)).get_val();
}
LIBC_INLINE static constexpr T max_normal() {
- return FPBits(MAX_NORMAL).get_val();
+ return FPBits(UP::max_normal(false)).get_val();
}
LIBC_INLINE static constexpr T min_denormal() {
- return FPBits(MIN_SUBNORMAL).get_val();
+ return FPBits(UP::min_subnormal(false)).get_val();
}
LIBC_INLINE static constexpr T max_denormal() {
- return FPBits(MAX_SUBNORMAL).get_val();
+ return FPBits(UP::max_subnormal(false)).get_val();
}
LIBC_INLINE static constexpr T build_nan(StorageType v) {
- StorageType rep = 0 // sign
- | EXP_MASK // exponent
- | (v & FRACTION_MASK); // mantissa
- return FPBits(rep).get_val();
+ return FPBits(UP::build_nan(false, v)).get_val();
}
LIBC_INLINE static constexpr T build_quiet_nan(StorageType v) {
- return build_nan(QUIET_NAN_MASK | v);
+ return FPBits(UP::build_quiet_nan(false, v)).get_val();
}
LIBC_INLINE static constexpr FPBits<T>
create_value(bool sign, StorageType biased_exp, StorageType mantissa) {
- StorageType rep = (sign ? SIGN_MASK : StorageType(0)) // sign
- | ((biased_exp << EXP_MASK_SHIFT) & EXP_MASK) // exponent
- | (mantissa & FRACTION_MASK); // mantissa
- return FPBits(rep);
+ static_assert(get_fp_type<T>() != FPType::X86_Binary80,
+ "This function is not tested for X86 Extended Precision");
+ return FPBits(UP::encode(sign, typename UP::Exp(biased_exp - UP::EXP_BIAS),
+ typename UP::Sig(mantissa)));
}
// The function convert integer number and unbiased exponent to proper float
@@ -434,6 +630,8 @@ template <typename T> struct FPBits : public internal::FPRep<get_fp_type<T>()> {
// 5) Number is unsigned, so the result can be only positive.
LIBC_INLINE static constexpr FPBits<T> make_value(StorageType number,
int ep) {
+ static_assert(get_fp_type<T>() != FPType::X86_Binary80,
+ "This function is not tested for X86 Extended Precision");
FPBits<T> result;
// offset: +1 for sign, but -1 for implicit first bit
int lz = cpp::countl_zero(number) - EXP_LEN;
@@ -454,8 +652,4 @@ template <typename T> struct FPBits : public internal::FPRep<get_fp_type<T>()> {
} // namespace fputil
} // namespace LIBC_NAMESPACE
-#ifdef LIBC_LONG_DOUBLE_IS_X86_FLOAT80
-#include "x86_64/LongDoubleBits.h"
-#endif
-
#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_FPBITS_H
diff --git a/libc/src/__support/FPUtil/generic/sqrt_80_bit_long_double.h b/libc/src/__support/FPUtil/generic/sqrt_80_bit_long_double.h
index 257c02e17d0045c..8815a18cfbc393b 100644
--- a/libc/src/__support/FPUtil/generic/sqrt_80_bit_long_double.h
+++ b/libc/src/__support/FPUtil/generic/sqrt_80_bit_long_double.h
@@ -131,7 +131,7 @@ LIBC_INLINE long double sqrt(long double x) {
out.set_implicit_bit(1);
out.set_mantissa((y & (ONE - 1)));
- return out;
+ return out.get_val();
}
}
#endif // LIBC_LONG_DOUBLE_IS_X86_FLOAT80
diff --git a/libc/src/__support/FPUtil/x86_64/LongDoubleBits.h b/libc/src/__support/FPUtil/x86_64/LongDoubleBits.h
deleted file mode 100644
index c18abcee77ea50d..000000000000000
--- a/libc/src/__support/FPUtil/x86_64/LongDoubleBits.h
+++ /dev/null
@@ -1,179 +0,0 @@
-//===-- Bit representation of x86 long double numbers -----------*- 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___SUPPORT_FPUTIL_X86_64_LONGDOUBLEBITS_H
-#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_LONGDOUBLEBITS_H
-
-#include "src/__support/CPP/bit.h"
-#include "src/__support/UInt128.h"
-#include "src/__support/common.h"
-#include "src/__support/macros/attributes.h" // LIBC_INLINE
-#include "src/__support/macros/properties/architectures.h"
-
-#if !defined(LIBC_TARGET_ARCH_IS_X86)
-#error "Invalid include"
-#endif
-
-#include "src...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/78192
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