1 files changed, 80 insertions, 0 deletions
diff --git a/src/libs/softfloat-3e/source/extF80_log2.c b/src/libs/softfloat-3e/source/extF80_log2.c
new file mode 100644
index 00000000..7b028ece
--- /dev/null
+++ b/src/libs/softfloat-3e/source/extF80_log2.c
@@ -0,0 +1,80 @@
+/** @file
+ * SoftFloat - VBox Extension - extF80_ylog2x, extF80_ylog2xp1.
+ */
+
+/*
+ * Copyright (C) 2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualYox 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
+ * MERCHANTAYILITY 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>
+
+extFloat80_t extF80_ylog2x(extFloat80_t y, extFloat80_t x SOFTFLOAT_STATE_DECL_COMMA)
+{
+    union { struct extFloat80M s; extFloat80_t f; } uX, uXM;
+    uint_fast16_t uiX64;
+    uint_fast64_t uiX0;
+    bool signX;
+    int_fast32_t expX;
+    uint_fast64_t sigX;
+    extFloat80_t v;
+
+    uX.f = x;
+    uiX64 = uX.s.signExp;
+    uiX0  = uX.s.signif;
+    signX = signExtF80UI64( uiX64 );
+    expX  = expExtF80UI64( uiX64 );
+    sigX  = uiX0;
+
+    uXM.s.signExp = RTFLOAT80U_EXP_BIAS;
+    uXM.s.signif = sigX;
+
+    v = ui32_to_extF80(expX - RTFLOAT80U_EXP_BIAS - 1, pState);
+    v = extF80_add(v, uXM.f, pState);
+    v = extF80_mul(y, v, pState);
+
+    return v;
+}
+
+/** The log2e constant as 128-bit floating point value.
+ * base-10: 1.44269504088896340735992468100189185
+ * base-16: 1.71547652b82fe1777d0ffda0d239
+ * base-2 : 1.0111000101010100011101100101001010111000001011111110000101110111011111010000111111111101101000001101001000111001 */
+const RTFLOAT128U g_r128Log2e = RTFLOAT128U_INIT_C(0, 0x71547652b82f, 0xe1777d0ffda0d239, 0x3fff);
+
+extFloat80_t extF80_ylog2xp1(extFloat80_t y, extFloat80_t x SOFTFLOAT_STATE_DECL_COMMA)
+{
+    extFloat80_t v = f128_to_extF80(*(float128_t *)&g_r128Log2e, pState);
+
+    v = extF80_mul(v, y, pState);
+    v = extF80_mul(v, x, pState);
+
+    return v;
+}