[libc-commits] [libc] [libc] Add sinpif16 function (PR #110994)

[via libc-commits]

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@@ -0,0 +1,187 @@
+//===-- Half-precision sinpif function ------------------------------------===//
+//
+// 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/sinpif16.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/PolyEval.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"
+
+namespace LIBC_NAMESPACE_DECL {
+
+// Lookup table for sin(k * pi / 32) with k = 0, ..., 63.
+// Table is generated with Sollya as follows:
+// > display = hexadecimmal;
+// > for k from 0 to 63 do { round(sin(k * pi/32), SG, RN); };
+const float SIN_K_PI_OVER_32[64] = {0,
+                                    0x1.917a6cp-4,
+                                    0x1.8f8b84p-3,
+                                    0x1.294062p-2,
+                                    0x1.87de2ap-2,
+                                    0x1.e2b5d4p-2,
+                                    0x1.1c73b4p-1,
+                                    0x1.44cf32p-1,
+                                    0x1.6a09e6p-1,
+                                    0x1.8bc806p-1,
+                                    0x1.a9b662p-1,
+                                    0x1.c38b3p-1,
+                                    0x1.d906bcp-1,
+                                    0x1.e9f416p-1,
+                                    0x1.f6297cp-1,
+                                    0x1.fd88dap-1,
+                                    0x1p0,
+                                    0x1.fd88dap-1,
+                                    0x1.f6297cp-1,
+                                    0x1.e9f416p-1,
+                                    0x1.d906bcp-1,
+                                    0x1.c38b3p-1,
+                                    0x1.a9b662p-1,
+                                    0x1.8bc806p-1,
+                                    0x1.6a09e6p-1,
+                                    0x1.44cf32p-1,
+                                    0x1.1c73b4p-1,
+                                    0x1.e2b5d4p-2,
+                                    0x1.87de2ap-2,
+                                    0x1.294062p-2,
+                                    0x1.8f8b84p-3,
+                                    0x1.917a6cp-4,
+                                    0,
+                                    -0x1.917a6cp-4,
+                                    -0x1.8f8b84p-3,
+                                    -0x1.294062p-2,
+                                    -0x1.87de2ap-2,
+                                    -0x1.e2b5d4p-2,
+                                    -0x1.1c73b4p-1,
+                                    -0x1.44cf32p-1,
+                                    -0x1.6a09e6p-1,
+                                    -0x1.8bc806p-1,
+                                    -0x1.a9b662p-1,
+                                    -0x1.c38b3p-1,
+                                    -0x1.d906bcp-1,
+                                    -0x1.e9f416p-1,
+                                    -0x1.f6297ep-1,
+                                    -0x1.fd88dap-1,
+                                    -0x1p0,
+                                    -0x1.fd88dap-1,
+                                    -0x1.f6297cp-1,
+                                    -0x1.e9f416p-1,
+                                    -0x1.d906bcp-1,
+                                    -0x1.c38b3p-1,
+                                    -0x1.a9b662p-1,
+                                    -0x1.8bc806p-1,
+                                    -0x1.6a09e6p-1,
+                                    -0x1.44cf32p-1,
+                                    -0x1.1c73b4p-1,
+                                    -0x1.e2b5d4p-2,
+                                    -0x1.87de2ap-2,
+                                    -0x1.294062p-2,
+                                    -0x1.8f8b84p-3,
+                                    -0x1.917a6cp-4};
+
+int32_t range_reduction(float x, float &y) {
----------------
lntue wrote:

add `LIBC_INLINE`

https://github.com/llvm/llvm-project/pull/110994