[libc-commits] [libc] [libc][math] Implementation of sinpi, correctly rounded to all modes (PR #137953)
via libc-commits
libc-commits at lists.llvm.org
Fri May 2 12:40:46 PDT 2025
https://github.com/nspheric updated https://github.com/llvm/llvm-project/pull/137953
>From 9f00f15334e3ccd481308d65fb31153b2b9c0c58 Mon Sep 17 00:00:00 2001
From: Job Hernandez Lara <jobhlara at gmail.com>
Date: Wed, 30 Apr 2025 03:53:21 -0700
Subject: [PATCH 01/11] first commit
---
libc/src/math/generic/sinpi.cpp | 95 +++++++++++++++++++++++++++++
libc/test/math/smoke/sinpi_test.cpp | 47 ++++++++++++++
libc/test/src/math/sinpi_test.cpp | 87 ++++++++++++++++++++++++++
3 files changed, 229 insertions(+)
create mode 100644 libc/src/math/generic/sinpi.cpp
create mode 100644 libc/test/math/smoke/sinpi_test.cpp
create mode 100644 libc/test/src/math/sinpi_test.cpp
diff --git a/libc/src/math/generic/sinpi.cpp b/libc/src/math/generic/sinpi.cpp
new file mode 100644
index 0000000000000..31aa5f105617c
--- /dev/null
+++ b/libc/src/math/generic/sinpi.cpp
@@ -0,0 +1,95 @@
+#include "src/math/sinpi.h"
+#include "sincos_eval.h"
+#include "src/__support/FPUtil/BasicOperations.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/multiply_add.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/FPUtil/double_double.h"
+#include "src/__support/FPUtil/generic/mul.h"
+#include "src/__support/FPUtil/nearest_integer.h"
+#include "src/math/pow.h"
+//#include "range_reduction_double_nofma.h"
+//#include "src/__support/FPUtil/multiply_add.h"
+//#include "src/math/generic/range_reduction_double_common.h"
+#include <iostream>
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(double, sinpi, (double x)) {
+ // Given x * pi = y - (k * (pi/128))
+ // find y and k such that
+ // y = x * pi - (k * pi/128) = x * pi - kpi/128
+ // k = round(x, 128)
+
+ using FPBits = typename fputil::FPBits<double>;
+ using DoubleDouble = fputil::DoubleDouble;
+
+ FPBits xbits(x);
+
+ double k = fputil::nearest_integer(x * 128);
+ int k_int = static_cast<int>(k);
+
+ std::cout << "k" << k << std::endl;
+
+ double yk = x - k/128;
+
+ DoubleDouble yy = fputil::exact_mult(yk, 3.141592653589793115997963468544185161590576171875);
+ yy.lo = fputil::multiply_add(yk, 1.2246467991473532071737640294583966046256921246776e-16, yy.lo);
+
+ uint64_t abs_u = xbits.uintval();
+
+ uint64_t x_abs = abs_u & 0xFFFFFFFFFFFFFFFF;
+
+ if (LIBC_UNLIKELY(x_abs == 0U))
+ return x;
+ if (x_abs >= 0x4330000000000000) {
+ if (xbits.is_nan())
+ return x;
+ if (xbits.is_inf()) {
+ fputil::set_errno_if_required(EDOM);
+ fputil::raise_except_if_required(FE_INVALID);
+ return FPBits::quiet_nan().get_val();
+ }
+ return FPBits::zero(xbits.sign()).get_val();
+ }
+
+ DoubleDouble sin_y, cos_y;
+
+ [[maybe_unused]] double err = generic::sincos_eval(yy, sin_y, cos_y);
+ DoubleDouble sin_k = SIN_K_PI_OVER_128[k_int & 255];
+ DoubleDouble cos_k = SIN_K_PI_OVER_128[(k_int + 64) & 255];
+
+ std::cout << "sin_k: " << sin_k.hi << std::endl;
+ std::cout << "sin_klo: " << sin_k.lo << std::endl;
+ std::cout << "sin_y: " << sin_y.hi << std::endl;
+ std::cout << "cos_y: " << cos_y.hi << std::endl;
+ std::cout << "sin_y.lo: " << sin_y.lo << std::endl;
+ std::cout << "cos_y.o: " << cos_y.lo << std::endl;
+
+ double cosm1_y = cos_y.hi - 1.0;
+ DoubleDouble sin_y_cos_k = fputil::quick_mult(sin_y, cos_k);
+
+ std::cout << "cosm1" << cosm1_y << std::endl;
+ DoubleDouble cosm1_yy;
+ cosm1_yy.hi = cosm1_y;
+ cosm1_yy.lo = 0.0;
+
+ DoubleDouble cos_y_sin_k = fputil::quick_mult(cos_y, sin_k);
+ DoubleDouble rr = fputil::exact_add<false>(sin_y_cos_k.hi, cos_y_sin_k.hi);
+
+ std::cout << "r.hi:" << rr.hi << std::endl;
+ std::cout << "r.lo" << rr.lo << std::endl;
+
+ rr.lo += sin_y_cos_k.lo + cos_y_sin_k.lo;
+
+ std::cout << "rrlo2: " << rr.lo << std::endl;
+ std::cout << "cos_y_sin_k:" << cos_y_sin_k.hi << std::endl;
+ std::cout << "siny*cosk.lo:" << sin_y_cos_k.lo << std::endl;
+ std::cout << "rrhi + rrlo + sink.hi " << rr.hi + rr.lo + sin_k.hi + sin_k.lo << std::endl;
+ std::cout << "rrhi + rrlo " << rr.hi + rr.lo << std::endl;
+
+ return rr.hi + rr.lo;
+ }
+} // namespace LIBC_NAMESPACE_DE
diff --git a/libc/test/math/smoke/sinpi_test.cpp b/libc/test/math/smoke/sinpi_test.cpp
new file mode 100644
index 0000000000000..2b39189a365d4
--- /dev/null
+++ b/libc/test/math/smoke/sinpi_test.cpp
@@ -0,0 +1,47 @@
+//===-- Unittests for sinpi -----------------------------------------------===//
+//
+// 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/FPUtil/cast.h"
+#include "src/errno/libc_errno.h"
+#include "src/math/sinpi.h"
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using LlvmLibcSinpiTest = LIBC_NAMESPACE::testing::FPTest<double>;
+/*
+TEST_F(LlvmLibcSinpiTest, SpecialNumbers) {
+ LIBC_NAMESPACE::libc_errno = 0;
+ EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::sinpi(aNaN));
+ EXPECT_MATH_ERRNO(0);
+ EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(zero));
+ EXPECT_MATH_ERRNO(0);
+ EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(neg_zero));
+ EXPECT_MATH_ERRNO(0);
+ EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::sinpi(inf));
+ EXPECT_MATH_ERRNO(EDOM);
+ EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::sinpi(neg_inf));
+ EXPECT_MATH_ERRNO(EDOM);
+}
+TEST_F(LlvmLibcSinpiTest, Integers) {
+ EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000003p52));
+
+ ASSERT_FP_EQ(-1.0, LIBC_NAMESPACE::sinpi(4499003037990983.5));
+ EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000005p52));
+ EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000006p52));
+ EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(0x1.0p1020));
+ EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(0x1.0000000000003p52));
+ EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(0x1.0000000000005p52));
+ EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(0x1.0000000000006p52));
+}
+*/
+
+TEST_F(LlvmLibcSinpiTest, Integers) {
+ //ASSERT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(4503563146482784.00000000000000000000000000000000000000000000000000));
+
+ ASSERT_FP_EQ(-1.0, LIBC_NAMESPACE::sinpi(4499003037990983.50000000000000000000000000000000000000000000000000));
+}
diff --git a/libc/test/src/math/sinpi_test.cpp b/libc/test/src/math/sinpi_test.cpp
new file mode 100644
index 0000000000000..47cc397c25734
--- /dev/null
+++ b/libc/test/src/math/sinpi_test.cpp
@@ -0,0 +1,87 @@
+//===-- Exhaustive test for sinpif16 --------------------------------------===//
+//
+// 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/math/sinpi.h"
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+#include "utils/MPFRWrapper/MPFRUtils.h"
+
+#include <iostream>
+
+using LlvmLibcSinpiTest = LIBC_NAMESPACE::testing::FPTest<double>;
+using namespace std;
+namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
+
+using LIBC_NAMESPACE::testing::tlog;
+
+TEST_F(LlvmLibcSinpiTest, InDoubleRange) {
+ constexpr uint64_t COUNT = 1'234'51;
+ uint64_t START = LIBC_NAMESPACE::fputil::FPBits<double>(0x1.0p-50).uintval();
+ uint64_t STOP = LIBC_NAMESPACE::fputil::FPBits<double>(0x1.0p200).uintval();
+ uint64_t STEP = (STOP - START) / COUNT;
+
+ auto test = [&](mpfr::RoundingMode rounding_mode) {
+ mpfr::ForceRoundingMode __r(rounding_mode);
+ if (!__r.success)
+ return;
+
+ uint64_t fails = 0;
+ uint64_t count = 0;
+ uint64_t cc = 0;
+ double mx, mr = 0.0;
+ double tol = 2.0;
+
+ for (uint64_t i = 0, v = START; i <= COUNT; ++i, v += STEP) {
+ double x = FPBits(v).get_val();
+ if (FPBits(v).is_nan() || FPBits(v).is_inf())
+ continue;
+ LIBC_NAMESPACE::libc_errno = 0;
+ double result = LIBC_NAMESPACE::sinpi(x);
+ std::cout << "result: " << result << std::endl;
+ ++cc;
+ if (FPBits(result).is_nan() || FPBits(result).is_inf())
+ continue;
+
+ ++count;
+
+
+ if (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Sinpi, x, result,
+ 2.0, rounding_mode)) {
+ ++fails;
+ while (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Sinpi, x,
+ result, tol, rounding_mode)) {
+ mx = x;
+ mr = result;
+
+ if (tol > 1000.0)
+ break;
+
+ tol *= 2.0;
+ }
+ }
+ }
+ if (fails) {
+ tlog << " Sin failed: " << fails << "/" << count << "/" << cc
+ << " tests.\n";
+ tlog << " Max ULPs is at most: " << static_cast<uint64_t>(tol) << ".\n";
+ EXPECT_MPFR_MATCH(mpfr::Operation::Sinpi, mx, mr, 2.0, rounding_mode);
+ }
+
+ };
+ tlog << " Test Rounding To Nearest...\n";
+ test(mpfr::RoundingMode::Nearest);
+
+ tlog << " Test Rounding Downward...\n";
+ test(mpfr::RoundingMode::Downward);
+
+ tlog << " Test Rounding Upward...\n";
+ test(mpfr::RoundingMode::Upward);
+
+ tlog << " Test Rounding Toward Zero...\n";
+ test(mpfr::RoundingMode::TowardZero);
+}
>From cbff53fbb80ea16c747639ba80c493ac6dec6250 Mon Sep 17 00:00:00 2001
From: Job Hernandez Lara <jobhlara at gmail.com>
Date: Thu, 1 May 2025 19:37:30 -0700
Subject: [PATCH 02/11] add cmake entries and make integer test pass.
---
libc/config/baremetal/aarch64/entrypoints.txt | 1 +
libc/config/baremetal/arm/entrypoints.txt | 1 +
libc/config/baremetal/riscv/entrypoints.txt | 1 +
libc/config/darwin/arm/entrypoints.txt | 1 +
libc/config/linux/x86_64/entrypoints.txt | 1 +
libc/include/math.yaml | 6 +++
libc/src/math/CMakeLists.txt | 1 +
libc/src/math/generic/CMakeLists.txt | 23 ++++++++-
.../generic/range_reduction_double_common.h | 2 +-
libc/src/math/generic/sinpi.cpp | 13 +++--
libc/src/math/sinpi.h | 20 ++++++++
libc/test/src/math/CMakeLists.txt | 17 +++++++
libc/test/src/math/smoke/CMakeLists.txt | 13 +++++
libc/test/src/math/smoke/sinpi_test.cpp | 47 +++++++++++++++++++
14 files changed, 140 insertions(+), 7 deletions(-)
create mode 100644 libc/src/math/sinpi.h
create mode 100644 libc/test/src/math/smoke/sinpi_test.cpp
diff --git a/libc/config/baremetal/aarch64/entrypoints.txt b/libc/config/baremetal/aarch64/entrypoints.txt
index a8e653fdd5159..03c623fd8f5ca 100644
--- a/libc/config/baremetal/aarch64/entrypoints.txt
+++ b/libc/config/baremetal/aarch64/entrypoints.txt
@@ -525,6 +525,7 @@ set(TARGET_LIBM_ENTRYPOINTS
libc.src.math.sincosf
libc.src.math.sinf
libc.src.math.sinhf
+ libc.src.math.sinpi
libc.src.math.sinpif
libc.src.math.sqrt
libc.src.math.sqrtf
diff --git a/libc/config/baremetal/arm/entrypoints.txt b/libc/config/baremetal/arm/entrypoints.txt
index acafef17fa5d1..69b45e8320047 100644
--- a/libc/config/baremetal/arm/entrypoints.txt
+++ b/libc/config/baremetal/arm/entrypoints.txt
@@ -525,6 +525,7 @@ set(TARGET_LIBM_ENTRYPOINTS
libc.src.math.sincosf
libc.src.math.sinf
libc.src.math.sinhf
+ libc.src.math.sinpi
libc.src.math.sinpif
libc.src.math.sqrt
libc.src.math.sqrtf
diff --git a/libc/config/baremetal/riscv/entrypoints.txt b/libc/config/baremetal/riscv/entrypoints.txt
index 023826f12d723..9f28289ff726b 100644
--- a/libc/config/baremetal/riscv/entrypoints.txt
+++ b/libc/config/baremetal/riscv/entrypoints.txt
@@ -525,6 +525,7 @@ set(TARGET_LIBM_ENTRYPOINTS
libc.src.math.sincosf
libc.src.math.sinf
libc.src.math.sinhf
+ libc.src.math.sinpi
libc.src.math.sinpif
libc.src.math.sqrt
libc.src.math.sqrtf
diff --git a/libc/config/darwin/arm/entrypoints.txt b/libc/config/darwin/arm/entrypoints.txt
index 70c888aec064c..db43dc3afe241 100644
--- a/libc/config/darwin/arm/entrypoints.txt
+++ b/libc/config/darwin/arm/entrypoints.txt
@@ -344,6 +344,7 @@ set(TARGET_LIBM_ENTRYPOINTS
libc.src.math.sincosf
libc.src.math.sinf
libc.src.math.sinhf
+ libc.src.math.sinpi
libc.src.math.sinpif
libc.src.math.sqrt
libc.src.math.sqrtf
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 2ac016f065b2e..3fb7a66fa9780 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -624,6 +624,7 @@ set(TARGET_LIBM_ENTRYPOINTS
libc.src.math.sincosf
libc.src.math.sinf
libc.src.math.sinhf
+ libc.src.math.sinpi
libc.src.math.sinpif
libc.src.math.sqrt
libc.src.math.sqrtf
diff --git a/libc/include/math.yaml b/libc/include/math.yaml
index f8c57f7d48ab2..30b171db48d47 100644
--- a/libc/include/math.yaml
+++ b/libc/include/math.yaml
@@ -2440,6 +2440,12 @@ functions:
arguments:
- type: _Float16
guard: LIBC_TYPES_HAS_FLOAT16
+ - name: sinpi
+ standards:
+ - stdc
+ return_type: double
+ arguments:
+ - type: double
- name: sinpif16
standards:
- stdc
diff --git a/libc/src/math/CMakeLists.txt b/libc/src/math/CMakeLists.txt
index 055e76468a461..cdbe6b1f86dfc 100644
--- a/libc/src/math/CMakeLists.txt
+++ b/libc/src/math/CMakeLists.txt
@@ -498,6 +498,7 @@ add_math_entrypoint_object(sincosf)
add_math_entrypoint_object(sin)
add_math_entrypoint_object(sinf)
add_math_entrypoint_object(sinf16)
+add_math_entrypoint_object(sinpi)
add_math_entrypoint_object(sinpif)
add_math_entrypoint_object(sinpif16)
diff --git a/libc/src/math/generic/CMakeLists.txt b/libc/src/math/generic/CMakeLists.txt
index b08486ac61366..de4fd49761615 100644
--- a/libc/src/math/generic/CMakeLists.txt
+++ b/libc/src/math/generic/CMakeLists.txt
@@ -1,5 +1,3 @@
-
-
add_entrypoint_object(
canonicalize
SRCS
@@ -495,6 +493,27 @@ add_entrypoint_object(
libc.src.__support.macros.optimization
)
+add_entrypoint_object(
+ sinpi
+ SRCS
+ sinpi.cpp
+ HDRS
+ ../sinpi.h
+ range_reduction_double_fma.h
+ DEPENDS
+ .range_reduction_double
+ .sincos_eval
+ libc.hdr.errno_macros
+ libc.src.errno.errno
+ libc.src.__support.FPUtil.double_double
+ libc.src.__support.FPUtil.dyadic_float
+ libc.src.__support.FPUtil.fenv_impl
+ libc.src.__support.FPUtil.fp_bits
+ libc.src.__support.FPUtil.multiply_add
+ libc.src.__support.FPUtil.rounding_mode
+ libc.src.__support.macros.optimization
+)
+
add_entrypoint_object(
sinpif
SRCS
diff --git a/libc/src/math/generic/range_reduction_double_common.h b/libc/src/math/generic/range_reduction_double_common.h
index f3dcdb937333c..4e7d50fc93f67 100644
--- a/libc/src/math/generic/range_reduction_double_common.h
+++ b/libc/src/math/generic/range_reduction_double_common.h
@@ -278,7 +278,7 @@ struct LargeRangeReduction {
};
#ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS
-static Float128 range_reduction_small_f128(double x) {
+[[maybe_unused]] static Float128 range_reduction_small_f128(double x) {
constexpr Float128 PI_OVER_128_F128 = {
Sign::POS, -133, 0xc90f'daa2'2168'c234'c4c6'628b'80dc'1cd1_u128};
constexpr double ONE_TWENTY_EIGHT_OVER_PI_D = 0x1.45f306dc9c883p5;
diff --git a/libc/src/math/generic/sinpi.cpp b/libc/src/math/generic/sinpi.cpp
index 31aa5f105617c..f2971806d9c81 100644
--- a/libc/src/math/generic/sinpi.cpp
+++ b/libc/src/math/generic/sinpi.cpp
@@ -10,7 +10,7 @@
#include "src/__support/FPUtil/generic/mul.h"
#include "src/__support/FPUtil/nearest_integer.h"
#include "src/math/pow.h"
-//#include "range_reduction_double_nofma.h"
+#include "range_reduction_double_nofma.h"
//#include "src/__support/FPUtil/multiply_add.h"
//#include "src/math/generic/range_reduction_double_common.h"
#include <iostream>
@@ -41,10 +41,13 @@ LLVM_LIBC_FUNCTION(double, sinpi, (double x)) {
uint64_t abs_u = xbits.uintval();
uint64_t x_abs = abs_u & 0xFFFFFFFFFFFFFFFF;
-
+
if (LIBC_UNLIKELY(x_abs == 0U))
return x;
- if (x_abs >= 0x4330000000000000) {
+ // When |x| > 2^51, x is an Integer or Nan
+ if (x_abs >= 0x59000000) {
+ // |x| >= 2^52
+ if (x_abs >= 0x4330000000000000) {
if (xbits.is_nan())
return x;
if (xbits.is_inf()) {
@@ -52,8 +55,10 @@ LLVM_LIBC_FUNCTION(double, sinpi, (double x)) {
fputil::raise_except_if_required(FE_INVALID);
return FPBits::quiet_nan().get_val();
}
- return FPBits::zero(xbits.sign()).get_val();
+ }
+ return FPBits::zero(xbits.sign()).get_val();
}
+
DoubleDouble sin_y, cos_y;
diff --git a/libc/src/math/sinpi.h b/libc/src/math/sinpi.h
new file mode 100644
index 0000000000000..e468b6df51167
--- /dev/null
+++ b/libc/src/math/sinpi.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for sinpi -----------------------*- 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_SINPI_H
+#define LLVM_LIBC_SRC_MATH_SINPI_H
+
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+ double sinpi(double x);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_SINPI_H
diff --git a/libc/test/src/math/CMakeLists.txt b/libc/test/src/math/CMakeLists.txt
index fba6b6f133163..018eccb225ff1 100644
--- a/libc/test/src/math/CMakeLists.txt
+++ b/libc/test/src/math/CMakeLists.txt
@@ -107,6 +107,23 @@ add_fp_unittest(
libc.src.math.sinf16
)
+add_fp_unittest(
+ sinpi_test
+ NEED_MPFR
+ SUITE
+ libc-math-unittests
+ SRCS
+ sinpi_test.cpp
+ HDRS
+ sdcomp26094.h
+ DEPENDS
+ libc.src.errno.errno
+ libc.src.math.sinpi
+ libc.src.__support.CPP.array
+ libc.src.__support.FPUtil.fp_bits
+ libc.src.math.generic.range_reduction_double_nofma
+)
+
add_fp_unittest(
sinpif_test
NEED_MPFR
diff --git a/libc/test/src/math/smoke/CMakeLists.txt b/libc/test/src/math/smoke/CMakeLists.txt
index ca1ce7fb1f48c..8358945b323bf 100644
--- a/libc/test/src/math/smoke/CMakeLists.txt
+++ b/libc/test/src/math/smoke/CMakeLists.txt
@@ -73,6 +73,19 @@ add_fp_unittest(
libc.src.__support.FPUtil.cast
)
+add_fp_unittest(
+ sinpi_test
+ SUITE
+ libc-math-smoke-tests
+ SRCS
+ sinpi_test.cpp
+ DEPENDS
+ libc.src.errno.errno
+ libc.src.math.sinpi
+ libc.src.__support.CPP.array
+ libc.src.__support.FPUtil.fp_bits
+)
+
add_fp_unittest(
sinpif_test
SUITE
diff --git a/libc/test/src/math/smoke/sinpi_test.cpp b/libc/test/src/math/smoke/sinpi_test.cpp
new file mode 100644
index 0000000000000..15312f1603a63
--- /dev/null
+++ b/libc/test/src/math/smoke/sinpi_test.cpp
@@ -0,0 +1,47 @@
+//===-- Unittests for sinpi -----------------------------------------------===//
+//
+// 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/FPUtil/cast.h"
+#include "src/errno/libc_errno.h"
+#include "src/math/sinpi.h"
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using LlvmLibcSinpiTest = LIBC_NAMESPACE::testing::FPTest<double>;
+/*
+TEST_F(LlvmLibcSinpiTest, SpecialNumbers) {
+ LIBC_NAMESPACE::libc_errno = 0;
+ EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::sinpi(aNaN));
+ EXPECT_MATH_ERRNO(0);
+ EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(zero));
+ EXPECT_MATH_ERRNO(0);
+ EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(neg_zero));
+ EXPECT_MATH_ERRNO(0);
+ EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::sinpi(inf));
+ EXPECT_MATH_ERRNO(EDOM);
+ EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::sinpi(neg_inf));
+ EXPECT_MATH_ERRNO(EDOM);
+}
+TEST_F(LlvmLibcSinpiTest, Integers) {
+ EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000003p52));
+
+ ASSERT_FP_EQ(-1.0, LIBC_NAMESPACE::sinpi(4499003037990983.5));
+ EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000005p52));
+ EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000006p52));
+ EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(0x1.0p1020));
+ EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(0x1.0000000000003p52));
+ EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(0x1.0000000000005p52));
+ EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(0x1.0000000000006p52));
+}
+*/
+
+TEST_F(LlvmLibcSinpiTest, Integers) {
+ //ASSERT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(4503563146482784.00000000000000000000000000000000000000000000000000));
+
+ ASSERT_FP_EQ(-1.0, LIBC_NAMESPACE::sinpi(4499003037990983.50000000000000000000000000000000000000000000000000));
+}
>From 135d55eda02701dbc17da180437a1dd575b61126 Mon Sep 17 00:00:00 2001
From: Job Hernandez Lara <jobhlara at gmail.com>
Date: Thu, 1 May 2025 21:37:37 -0700
Subject: [PATCH 03/11] make test pass.
---
libc/src/math/generic/sinpi.cpp | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/libc/src/math/generic/sinpi.cpp b/libc/src/math/generic/sinpi.cpp
index f2971806d9c81..f9d448b207ad8 100644
--- a/libc/src/math/generic/sinpi.cpp
+++ b/libc/src/math/generic/sinpi.cpp
@@ -45,7 +45,9 @@ LLVM_LIBC_FUNCTION(double, sinpi, (double x)) {
if (LIBC_UNLIKELY(x_abs == 0U))
return x;
// When |x| > 2^51, x is an Integer or Nan
- if (x_abs >= 0x59000000) {
+ if (x_abs >= 0x4320000000000000) {
+ if (x_abs < 0x4330000000000000)
+ return (x_abs & 0x1) ? -1.0 : 1.0;
// |x| >= 2^52
if (x_abs >= 0x4330000000000000) {
if (xbits.is_nan())
>From 0752c68623498b26f35dea378e76ea97a2626825 Mon Sep 17 00:00:00 2001
From: Job Hernandez Lara <jobhlara at gmail.com>
Date: Thu, 1 May 2025 21:39:23 -0700
Subject: [PATCH 04/11] format code
---
libc/src/math/generic/sinpi.cpp | 62 +++++++++++++------------
libc/src/math/sinpi.h | 2 +-
libc/test/math/smoke/sinpi_test.cpp | 10 ++--
libc/test/src/math/sinpi_test.cpp | 2 -
libc/test/src/math/smoke/sinpi_test.cpp | 10 ++--
5 files changed, 47 insertions(+), 39 deletions(-)
diff --git a/libc/src/math/generic/sinpi.cpp b/libc/src/math/generic/sinpi.cpp
index f9d448b207ad8..71841ee1eceb4 100644
--- a/libc/src/math/generic/sinpi.cpp
+++ b/libc/src/math/generic/sinpi.cpp
@@ -1,24 +1,24 @@
#include "src/math/sinpi.h"
+#include "range_reduction_double_nofma.h"
#include "sincos_eval.h"
#include "src/__support/FPUtil/BasicOperations.h"
#include "src/__support/FPUtil/FEnvImpl.h"
#include "src/__support/FPUtil/FPBits.h"
-#include "src/__support/FPUtil/multiply_add.h"
-#include "src/__support/common.h"
-#include "src/__support/macros/config.h"
#include "src/__support/FPUtil/double_double.h"
#include "src/__support/FPUtil/generic/mul.h"
+#include "src/__support/FPUtil/multiply_add.h"
#include "src/__support/FPUtil/nearest_integer.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
#include "src/math/pow.h"
-#include "range_reduction_double_nofma.h"
-//#include "src/__support/FPUtil/multiply_add.h"
-//#include "src/math/generic/range_reduction_double_common.h"
+// #include "src/__support/FPUtil/multiply_add.h"
+// #include "src/math/generic/range_reduction_double_common.h"
#include <iostream>
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(double, sinpi, (double x)) {
- // Given x * pi = y - (k * (pi/128))
+ // Given x * pi = y - (k * (pi/128))
// find y and k such that
// y = x * pi - (k * pi/128) = x * pi - kpi/128
// k = round(x, 128)
@@ -29,38 +29,39 @@ LLVM_LIBC_FUNCTION(double, sinpi, (double x)) {
FPBits xbits(x);
double k = fputil::nearest_integer(x * 128);
- int k_int = static_cast<int>(k);
+ int k_int = static_cast<int>(k);
std::cout << "k" << k << std::endl;
- double yk = x - k/128;
+ double yk = x - k / 128;
- DoubleDouble yy = fputil::exact_mult(yk, 3.141592653589793115997963468544185161590576171875);
- yy.lo = fputil::multiply_add(yk, 1.2246467991473532071737640294583966046256921246776e-16, yy.lo);
+ DoubleDouble yy = fputil::exact_mult(
+ yk, 3.141592653589793115997963468544185161590576171875);
+ yy.lo = fputil::multiply_add(
+ yk, 1.2246467991473532071737640294583966046256921246776e-16, yy.lo);
uint64_t abs_u = xbits.uintval();
uint64_t x_abs = abs_u & 0xFFFFFFFFFFFFFFFF;
-
+
if (LIBC_UNLIKELY(x_abs == 0U))
return x;
- // When |x| > 2^51, x is an Integer or Nan
+ // When |x| > 2^51, x is an Integer or Nan
if (x_abs >= 0x4320000000000000) {
- if (x_abs < 0x4330000000000000)
- return (x_abs & 0x1) ? -1.0 : 1.0;
- // |x| >= 2^52
- if (x_abs >= 0x4330000000000000) {
- if (xbits.is_nan())
- return x;
- if (xbits.is_inf()) {
- fputil::set_errno_if_required(EDOM);
- fputil::raise_except_if_required(FE_INVALID);
- return FPBits::quiet_nan().get_val();
+ if (x_abs < 0x4330000000000000)
+ return (x_abs & 0x1) ? -1.0 : 1.0;
+ // |x| >= 2^52
+ if (x_abs >= 0x4330000000000000) {
+ if (xbits.is_nan())
+ return x;
+ if (xbits.is_inf()) {
+ fputil::set_errno_if_required(EDOM);
+ fputil::raise_except_if_required(FE_INVALID);
+ return FPBits::quiet_nan().get_val();
+ }
}
- }
- return FPBits::zero(xbits.sign()).get_val();
+ return FPBits::zero(xbits.sign()).get_val();
}
-
DoubleDouble sin_y, cos_y;
@@ -91,12 +92,13 @@ LLVM_LIBC_FUNCTION(double, sinpi, (double x)) {
rr.lo += sin_y_cos_k.lo + cos_y_sin_k.lo;
- std::cout << "rrlo2: " << rr.lo << std::endl;
+ std::cout << "rrlo2: " << rr.lo << std::endl;
std::cout << "cos_y_sin_k:" << cos_y_sin_k.hi << std::endl;
std::cout << "siny*cosk.lo:" << sin_y_cos_k.lo << std::endl;
- std::cout << "rrhi + rrlo + sink.hi " << rr.hi + rr.lo + sin_k.hi + sin_k.lo << std::endl;
+ std::cout << "rrhi + rrlo + sink.hi " << rr.hi + rr.lo + sin_k.hi + sin_k.lo
+ << std::endl;
std::cout << "rrhi + rrlo " << rr.hi + rr.lo << std::endl;
return rr.hi + rr.lo;
- }
-} // namespace LIBC_NAMESPACE_DE
+}
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/math/sinpi.h b/libc/src/math/sinpi.h
index e468b6df51167..bd868188fafaf 100644
--- a/libc/src/math/sinpi.h
+++ b/libc/src/math/sinpi.h
@@ -13,7 +13,7 @@
namespace LIBC_NAMESPACE_DECL {
- double sinpi(double x);
+double sinpi(double x);
} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/test/math/smoke/sinpi_test.cpp b/libc/test/math/smoke/sinpi_test.cpp
index 2b39189a365d4..2dd034c2c35c4 100644
--- a/libc/test/math/smoke/sinpi_test.cpp
+++ b/libc/test/math/smoke/sinpi_test.cpp
@@ -29,7 +29,7 @@ TEST_F(LlvmLibcSinpiTest, SpecialNumbers) {
}
TEST_F(LlvmLibcSinpiTest, Integers) {
EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000003p52));
-
+
ASSERT_FP_EQ(-1.0, LIBC_NAMESPACE::sinpi(4499003037990983.5));
EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000005p52));
EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000006p52));
@@ -41,7 +41,11 @@ TEST_F(LlvmLibcSinpiTest, Integers) {
*/
TEST_F(LlvmLibcSinpiTest, Integers) {
- //ASSERT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(4503563146482784.00000000000000000000000000000000000000000000000000));
+ // ASSERT_FP_EQ(zero,
+ // LIBC_NAMESPACE::sinpi(4503563146482784.00000000000000000000000000000000000000000000000000));
- ASSERT_FP_EQ(-1.0, LIBC_NAMESPACE::sinpi(4499003037990983.50000000000000000000000000000000000000000000000000));
+ ASSERT_FP_EQ(
+ -1.0,
+ LIBC_NAMESPACE::sinpi(
+ 4499003037990983.50000000000000000000000000000000000000000000000000));
}
diff --git a/libc/test/src/math/sinpi_test.cpp b/libc/test/src/math/sinpi_test.cpp
index 47cc397c25734..54dd4fa5f2e69 100644
--- a/libc/test/src/math/sinpi_test.cpp
+++ b/libc/test/src/math/sinpi_test.cpp
@@ -49,7 +49,6 @@ TEST_F(LlvmLibcSinpiTest, InDoubleRange) {
++count;
-
if (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Sinpi, x, result,
2.0, rounding_mode)) {
++fails;
@@ -71,7 +70,6 @@ TEST_F(LlvmLibcSinpiTest, InDoubleRange) {
tlog << " Max ULPs is at most: " << static_cast<uint64_t>(tol) << ".\n";
EXPECT_MPFR_MATCH(mpfr::Operation::Sinpi, mx, mr, 2.0, rounding_mode);
}
-
};
tlog << " Test Rounding To Nearest...\n";
test(mpfr::RoundingMode::Nearest);
diff --git a/libc/test/src/math/smoke/sinpi_test.cpp b/libc/test/src/math/smoke/sinpi_test.cpp
index 15312f1603a63..2dd034c2c35c4 100644
--- a/libc/test/src/math/smoke/sinpi_test.cpp
+++ b/libc/test/src/math/smoke/sinpi_test.cpp
@@ -29,7 +29,7 @@ TEST_F(LlvmLibcSinpiTest, SpecialNumbers) {
}
TEST_F(LlvmLibcSinpiTest, Integers) {
EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000003p52));
-
+
ASSERT_FP_EQ(-1.0, LIBC_NAMESPACE::sinpi(4499003037990983.5));
EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000005p52));
EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000006p52));
@@ -41,7 +41,11 @@ TEST_F(LlvmLibcSinpiTest, Integers) {
*/
TEST_F(LlvmLibcSinpiTest, Integers) {
- //ASSERT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(4503563146482784.00000000000000000000000000000000000000000000000000));
+ // ASSERT_FP_EQ(zero,
+ // LIBC_NAMESPACE::sinpi(4503563146482784.00000000000000000000000000000000000000000000000000));
- ASSERT_FP_EQ(-1.0, LIBC_NAMESPACE::sinpi(4499003037990983.50000000000000000000000000000000000000000000000000));
+ ASSERT_FP_EQ(
+ -1.0,
+ LIBC_NAMESPACE::sinpi(
+ 4499003037990983.50000000000000000000000000000000000000000000000000));
}
>From 7abcde12918389ca3fbd3be5a10d41b52a48838a Mon Sep 17 00:00:00 2001
From: Job Hernandez Lara <jobhlara at gmail.com>
Date: Thu, 1 May 2025 22:10:30 -0700
Subject: [PATCH 05/11] simplify math
---
libc/src/math/generic/sinpi.cpp | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libc/src/math/generic/sinpi.cpp b/libc/src/math/generic/sinpi.cpp
index 71841ee1eceb4..3cebe0f83eb85 100644
--- a/libc/src/math/generic/sinpi.cpp
+++ b/libc/src/math/generic/sinpi.cpp
@@ -20,7 +20,7 @@ namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(double, sinpi, (double x)) {
// Given x * pi = y - (k * (pi/128))
// find y and k such that
- // y = x * pi - (k * pi/128) = x * pi - kpi/128
+ // y = x * pi - kpi/128
// k = round(x, 128)
using FPBits = typename fputil::FPBits<double>;
@@ -46,7 +46,7 @@ LLVM_LIBC_FUNCTION(double, sinpi, (double x)) {
if (LIBC_UNLIKELY(x_abs == 0U))
return x;
- // When |x| > 2^51, x is an Integer or Nan
+ // When |x| > 2^51, x is an Integer or Nan/Inf
if (x_abs >= 0x4320000000000000) {
if (x_abs < 0x4330000000000000)
return (x_abs & 0x1) ? -1.0 : 1.0;
>From 5a22a776bea7d73a1b332eea7d6e56d50f44dab4 Mon Sep 17 00:00:00 2001
From: Job Hernandez Lara <jobhlara at gmail.com>
Date: Thu, 1 May 2025 22:21:58 -0700
Subject: [PATCH 06/11] simplify tests.
---
libc/test/src/math/smoke/sinpi_test.cpp | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libc/test/src/math/smoke/sinpi_test.cpp b/libc/test/src/math/smoke/sinpi_test.cpp
index 2dd034c2c35c4..227d32eb8cb06 100644
--- a/libc/test/src/math/smoke/sinpi_test.cpp
+++ b/libc/test/src/math/smoke/sinpi_test.cpp
@@ -42,10 +42,10 @@ TEST_F(LlvmLibcSinpiTest, Integers) {
TEST_F(LlvmLibcSinpiTest, Integers) {
// ASSERT_FP_EQ(zero,
- // LIBC_NAMESPACE::sinpi(4503563146482784.00000000000000000000000000000000000000000000000000));
+ // LIBC_NAMESPACE::sinpi(4503563146482784.0));
ASSERT_FP_EQ(
-1.0,
LIBC_NAMESPACE::sinpi(
- 4499003037990983.50000000000000000000000000000000000000000000000000));
+ 4499003037990983.5
}
>From e3f69f7719f84a12a65711358d98fafb13a5a239 Mon Sep 17 00:00:00 2001
From: Job Hernandez Lara <jobhlara at gmail.com>
Date: Thu, 1 May 2025 22:26:47 -0700
Subject: [PATCH 07/11] remove file
---
libc/test/math/smoke/sinpi_test.cpp | 51 -----------------------------
1 file changed, 51 deletions(-)
delete mode 100644 libc/test/math/smoke/sinpi_test.cpp
diff --git a/libc/test/math/smoke/sinpi_test.cpp b/libc/test/math/smoke/sinpi_test.cpp
deleted file mode 100644
index 2dd034c2c35c4..0000000000000
--- a/libc/test/math/smoke/sinpi_test.cpp
+++ /dev/null
@@ -1,51 +0,0 @@
-//===-- Unittests for sinpi -----------------------------------------------===//
-//
-// 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/FPUtil/cast.h"
-#include "src/errno/libc_errno.h"
-#include "src/math/sinpi.h"
-#include "test/UnitTest/FPMatcher.h"
-#include "test/UnitTest/Test.h"
-
-using LlvmLibcSinpiTest = LIBC_NAMESPACE::testing::FPTest<double>;
-/*
-TEST_F(LlvmLibcSinpiTest, SpecialNumbers) {
- LIBC_NAMESPACE::libc_errno = 0;
- EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::sinpi(aNaN));
- EXPECT_MATH_ERRNO(0);
- EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(zero));
- EXPECT_MATH_ERRNO(0);
- EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(neg_zero));
- EXPECT_MATH_ERRNO(0);
- EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::sinpi(inf));
- EXPECT_MATH_ERRNO(EDOM);
- EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::sinpi(neg_inf));
- EXPECT_MATH_ERRNO(EDOM);
-}
-TEST_F(LlvmLibcSinpiTest, Integers) {
- EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000003p52));
-
- ASSERT_FP_EQ(-1.0, LIBC_NAMESPACE::sinpi(4499003037990983.5));
- EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000005p52));
- EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::sinpi(-0x1.0000000000006p52));
- EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(0x1.0p1020));
- EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(0x1.0000000000003p52));
- EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(0x1.0000000000005p52));
- EXPECT_FP_EQ(zero, LIBC_NAMESPACE::sinpi(0x1.0000000000006p52));
-}
-*/
-
-TEST_F(LlvmLibcSinpiTest, Integers) {
- // ASSERT_FP_EQ(zero,
- // LIBC_NAMESPACE::sinpi(4503563146482784.00000000000000000000000000000000000000000000000000));
-
- ASSERT_FP_EQ(
- -1.0,
- LIBC_NAMESPACE::sinpi(
- 4499003037990983.50000000000000000000000000000000000000000000000000));
-}
>From 822f8eae3006f02bc1496b6aeaa6b12006b426d3 Mon Sep 17 00:00:00 2001
From: Job Hernandez Lara <jobhlara at gmail.com>
Date: Thu, 1 May 2025 22:27:24 -0700
Subject: [PATCH 08/11] update
---
libc/test/src/math/smoke/sinpi_test.cpp | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libc/test/src/math/smoke/sinpi_test.cpp b/libc/test/src/math/smoke/sinpi_test.cpp
index 227d32eb8cb06..69539dec71e6e 100644
--- a/libc/test/src/math/smoke/sinpi_test.cpp
+++ b/libc/test/src/math/smoke/sinpi_test.cpp
@@ -47,5 +47,5 @@ TEST_F(LlvmLibcSinpiTest, Integers) {
ASSERT_FP_EQ(
-1.0,
LIBC_NAMESPACE::sinpi(
- 4499003037990983.5
+ 4499003037990983.5));
}
>From 0fe48b10184be5a4f1fa95e0e09c1fbf04bcd43d Mon Sep 17 00:00:00 2001
From: Job Hernandez Lara <jobhlara at gmail.com>
Date: Thu, 1 May 2025 22:27:57 -0700
Subject: [PATCH 09/11] format code
---
libc/test/src/math/smoke/sinpi_test.cpp | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/libc/test/src/math/smoke/sinpi_test.cpp b/libc/test/src/math/smoke/sinpi_test.cpp
index 69539dec71e6e..cb3d5f90ede06 100644
--- a/libc/test/src/math/smoke/sinpi_test.cpp
+++ b/libc/test/src/math/smoke/sinpi_test.cpp
@@ -44,8 +44,5 @@ TEST_F(LlvmLibcSinpiTest, Integers) {
// ASSERT_FP_EQ(zero,
// LIBC_NAMESPACE::sinpi(4503563146482784.0));
- ASSERT_FP_EQ(
- -1.0,
- LIBC_NAMESPACE::sinpi(
- 4499003037990983.5));
+ ASSERT_FP_EQ(-1.0, LIBC_NAMESPACE::sinpi(4499003037990983.5));
}
>From 8572c34e2a3c76abc8246a9649ff80359c04ed79 Mon Sep 17 00:00:00 2001
From: Job Hernandez Lara <jobhlara at gmail.com>
Date: Thu, 1 May 2025 22:44:56 -0700
Subject: [PATCH 10/11] add documentation
---
libc/src/math/generic/sinpi.cpp | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libc/src/math/generic/sinpi.cpp b/libc/src/math/generic/sinpi.cpp
index 3cebe0f83eb85..85ca5a4e07894 100644
--- a/libc/src/math/generic/sinpi.cpp
+++ b/libc/src/math/generic/sinpi.cpp
@@ -35,6 +35,9 @@ LLVM_LIBC_FUNCTION(double, sinpi, (double x)) {
double yk = x - k / 128;
+ // using Veltkamp splitting, we can use sollya to split pi:
+ // > x_h = round(pi, D, RN);
+ // > x_l = round(pi-x_h, D, RN);
DoubleDouble yy = fputil::exact_mult(
yk, 3.141592653589793115997963468544185161590576171875);
yy.lo = fputil::multiply_add(
>From 86cb41263b7bf2360aede63e208d85d4c3c48d20 Mon Sep 17 00:00:00 2001
From: Job Hernandez Lara <jobhlara at gmail.com>
Date: Fri, 2 May 2025 12:40:21 -0700
Subject: [PATCH 11/11] address comments/review
---
libc/include/math.yaml | 6 ++++++
libc/src/math/generic/CMakeLists.txt | 1 -
libc/src/math/generic/sinpi.cpp | 2 --
libc/test/src/math/CMakeLists.txt | 1 -
libc/test/src/math/smoke/sinpi_test.cpp | 6 +++---
5 files changed, 9 insertions(+), 7 deletions(-)
diff --git a/libc/include/math.yaml b/libc/include/math.yaml
index 30b171db48d47..f4b113a49fd1e 100644
--- a/libc/include/math.yaml
+++ b/libc/include/math.yaml
@@ -2446,6 +2446,12 @@ functions:
return_type: double
arguments:
- type: double
+ - name: sinpif
+ standards:
+ - stdc
+ return_type: float
+ arguments:
+ - type: float
- name: sinpif16
standards:
- stdc
diff --git a/libc/src/math/generic/CMakeLists.txt b/libc/src/math/generic/CMakeLists.txt
index de4fd49761615..ec3ce1ec6b0aa 100644
--- a/libc/src/math/generic/CMakeLists.txt
+++ b/libc/src/math/generic/CMakeLists.txt
@@ -499,7 +499,6 @@ add_entrypoint_object(
sinpi.cpp
HDRS
../sinpi.h
- range_reduction_double_fma.h
DEPENDS
.range_reduction_double
.sincos_eval
diff --git a/libc/src/math/generic/sinpi.cpp b/libc/src/math/generic/sinpi.cpp
index 85ca5a4e07894..664bec83f76a6 100644
--- a/libc/src/math/generic/sinpi.cpp
+++ b/libc/src/math/generic/sinpi.cpp
@@ -11,8 +11,6 @@
#include "src/__support/common.h"
#include "src/__support/macros/config.h"
#include "src/math/pow.h"
-// #include "src/__support/FPUtil/multiply_add.h"
-// #include "src/math/generic/range_reduction_double_common.h"
#include <iostream>
namespace LIBC_NAMESPACE_DECL {
diff --git a/libc/test/src/math/CMakeLists.txt b/libc/test/src/math/CMakeLists.txt
index 018eccb225ff1..822028557bfe4 100644
--- a/libc/test/src/math/CMakeLists.txt
+++ b/libc/test/src/math/CMakeLists.txt
@@ -121,7 +121,6 @@ add_fp_unittest(
libc.src.math.sinpi
libc.src.__support.CPP.array
libc.src.__support.FPUtil.fp_bits
- libc.src.math.generic.range_reduction_double_nofma
)
add_fp_unittest(
diff --git a/libc/test/src/math/smoke/sinpi_test.cpp b/libc/test/src/math/smoke/sinpi_test.cpp
index cb3d5f90ede06..fe969705ec9f4 100644
--- a/libc/test/src/math/smoke/sinpi_test.cpp
+++ b/libc/test/src/math/smoke/sinpi_test.cpp
@@ -41,8 +41,8 @@ TEST_F(LlvmLibcSinpiTest, Integers) {
*/
TEST_F(LlvmLibcSinpiTest, Integers) {
- // ASSERT_FP_EQ(zero,
- // LIBC_NAMESPACE::sinpi(4503563146482784.0));
+ ASSERT_FP_EQ(zero,LIBC_NAMESPACE::sinpi(4503563146));
- ASSERT_FP_EQ(-1.0, LIBC_NAMESPACE::sinpi(4499003037990983.5));
+ // ASSERT_FP_EQ(-1.0, LIBC_NAMESPACE::sinpi(4499003037990983.5));
+ //ASSERT_FP_EQ(1.0, LIBC_NAMESPACE::sinpi(4503563146482784.0));
}
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