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-rw-r--r--src/libs/softfloat-3e/source/extF80_tan.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/src/libs/softfloat-3e/source/extF80_tan.c b/src/libs/softfloat-3e/source/extF80_tan.c
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+++ b/src/libs/softfloat-3e/source/extF80_tan.c
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+/** @file
+ * SoftFloat - VBox Extension - extF80_tan.
+ */
+
+/*
+ * Copyright (C) 2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+
+/*********************************************************************************************************************************
+* Header Files *
+*********************************************************************************************************************************/
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+#include <iprt/types.h>
+#include <iprt/x86.h>
+
+extern const RTFLOAT128U g_r128pi2;
+
+extFloat80_t extF80_tan( extFloat80_t x SOFTFLOAT_STATE_DECL_COMMA )
+{
+ int32_t fSign = 0;
+ extFloat80_t v, f80Zero, f80One, f80Pi2;
+
+ f80Zero = ui32_to_extF80(0, pState);
+ f80One = ui32_to_extF80(1, pState);
+ f80Pi2 = f128_to_extF80(*(float128_t *)&g_r128pi2, pState);
+
+ if (extF80_le(x, f80Zero, pState))
+ {
+ x = extF80_sub(f80Zero, x, pState);
+ fSign = 1;
+ }
+
+ uint16_t fCxFlags = 0;
+ extFloat80_t rem = extF80_partialRem(x, f80Pi2, pState->roundingMode, &fCxFlags, pState);
+ int32_t const quo = X86_FSW_CX_TO_QUOTIENT(fCxFlags);
+
+ v = extF80_div(rem, f80Pi2, pState);
+ v = extF80_mul(v, v, pState);
+ v = extF80_sub(f80One, v, pState);
+ v = extF80_div(rem, v, pState);
+
+ if (quo % 2)
+ {
+ v = extF80_div(f80One, v, pState);
+ v = extF80_sub(f80Zero, v, pState);
+ }
+
+ if (fSign)
+ v = extF80_sub(f80Zero, v, pState);
+
+ return v;
+}