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First pass double_fp single-limb optimizations

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ckormanyos
2025-09-01 21:44:57 +02:00
parent d6bef9f5d2
commit d64f23f13b
3 changed files with 14 additions and 3 deletions
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7
include/boost/multiprecision/cpp_double_fp.hpp
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@@ -298,6 +298,8 @@ class cpp_double_fp_backend
int u_index { 1 };
float_type p2_flt { cpp_df_qf_detail::pow2_maker<float_type>::value(std::numeric_limits<float_type>::digits) };
while (u > static_cast<local_unsigned_integral_type>(UINT8_C(0)))
{
u >>= static_cast<unsigned>(std::numeric_limits<float_type>::digits);
@@ -305,13 +307,14 @@ class cpp_double_fp_backend
const float_type
xhi
{
static_cast<float_type>(u & flt_mask)
* cpp_df_qf_detail::pow2_maker<float_type>::value(std::numeric_limits<float_type>::digits * u_index)
static_cast<float_type>(u & flt_mask) * p2_flt
};
eval_add(*this, cpp_double_fp_backend(xhi));
++u_index;
p2_flt *= 2;
}
}

2
performance/performance_test_df.cpp
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@@ -51,7 +51,7 @@
#include "performance_test_df.hpp"
// cd /mnt/c/Users/ckorm/Documents/Ks/PC_Software/Test
// g++ -std=gnu++14 -Wall -Wextra -O3 -I/mnt/c/ChrisGitRepos/boost_gsoc2021/multiprecision/performance -I/mnt/c/ChrisGitRepos/boost_gsoc2021/multiprecision/include -I/mnt/c/boost/boost_1_87_0 ./test.cpp -lquadmath -o test
// g++ -std=gnu++14 -Wall -Wextra -O3 -I/mnt/c/ChrisGitRepos/modular_boost/multiprecision/performance -I/mnt/c/ChrisGitRepos/modular_boost/multiprecision/include -I/mnt/c/boost/boost_1_89_0 ./test.cpp -lquadmath -o test
//
// Keys in order are:

8
test/test_round.cpp
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@@ -60,9 +60,17 @@
#include <boost/multiprecision/float128.hpp>
#endif
#ifdef TEST_CPP_DOUBLE_FLOAT
// When using very old GCC, categorically disable this test for cpp_double_fp_backend.
// Do not attempt, at the moment, to track down the compiler's "internal failure".
#if (defined(BOOST_GCC) && !defined(BOOST_CLANG) && (BOOST_GCC < 80000))
#else
#include <boost/multiprecision/cpp_double_fp.hpp>
#endif
#endif
#ifdef BOOST_MSVC
#pragma warning(disable : 4127)
#endif