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-rw-r--r--src/libs/softfloat-3e/source/extF80_sincos.c323
1 files changed, 323 insertions, 0 deletions
diff --git a/src/libs/softfloat-3e/source/extF80_sincos.c b/src/libs/softfloat-3e/source/extF80_sincos.c
new file mode 100644
index 00000000..6836ad82
--- /dev/null
+++ b/src/libs/softfloat-3e/source/extF80_sincos.c
@@ -0,0 +1,323 @@
+/* $Id: extF80_sincos.c $ */
+/** @file
+ * SoftFloat - VBox Extension - extF80_sin, extF80_cos, extF80_sincos, extF80_atan2.
+ */
+
+/*
+ * Copyright (C) 2022-2023 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>
+
+#include "extF80_sincos.h"
+
+
+static void cordic_sincos( float128_t z, float128_t *pv1, float128_t *pv2 SOFTFLOAT_STATE_DECL_COMMA )
+{
+ float128_t v1 = { { 0, 0 } }; /* MSC thinks it can be used uninitialized */
+ float128_t v2 = { { 0, 0 } }; /* MSC thinks it can be used uninitialized */
+ /** @todo TBD: CORDIC kernel should be easily implemented in assembly * */
+
+ float128_t x1 = ui32_to_f128(1, pState);
+ float128_t x2 = ui32_to_f128(0, pState);
+ float128_t zz = ui32_to_f128(0, pState);
+
+ float128_t p2m = ui32_to_f128(1, pState);
+ float128_t two = ui32_to_f128(2, pState);
+
+ for (unsigned k = 0; k < RT_ELEMENTS(g_ar128FsincosCORDICConsts); k++)
+ {
+ float128_t atg = *(float128_t *)&g_ar128FsincosCORDICConsts[k];
+ float128_t scale = *(float128_t *)&g_ar128FsincosCORDICConsts2[k];
+
+ float128_t px1 = f128_mul(x1, p2m, pState);
+ float128_t px2 = f128_mul(x2, p2m, pState);
+
+ if (f128_le(zz, z, pState))
+ {
+ x1 = f128_sub(x1, px2, pState);
+ x2 = f128_add(x2, px1, pState);
+ zz = f128_add(zz, atg, pState);
+ }
+ else
+ {
+ x1 = f128_add(x1, px2, pState);
+ x2 = f128_sub(x2, px1, pState);
+ zz = f128_sub(zz, atg, pState);
+ }
+
+ p2m = f128_div(p2m, two, pState);
+
+ v1 = f128_mul(x1, scale, pState);
+ v2 = f128_mul(x2, scale, pState);
+ }
+
+ *pv1 = v1;
+ *pv2 = v2;
+}
+
+static float128_t cordic_atan2( float128_t y, float128_t x SOFTFLOAT_STATE_DECL_COMMA )
+{
+ float128_t v1 = { { 0, 0 } }; /* MSC thinks it can be used uninitialized */
+ float128_t v2 = { { 0, 0 } }; /* MSC thinks it can be used uninitialized */
+ /** @todo TBD: CORDIC kernel should be easily implemented in assembly * */
+
+ float128_t x1 = x, x2 = y;
+ float128_t z = ui32_to_f128(0, pState);
+ float128_t zero = ui32_to_f128(0, pState);
+ float128_t p2m = ui32_to_f128(1, pState);
+ float128_t two = ui32_to_f128(2, pState);
+
+ for (unsigned k = 0; k < RT_ELEMENTS(g_ar128FsincosCORDICConsts); k++)
+ {
+ float128_t atg = *(float128_t *)&g_ar128FsincosCORDICConsts[k];
+ float128_t scale = *(float128_t *)&g_ar128FsincosCORDICConsts2[k];
+
+ float128_t px1 = f128_mul(x1, p2m, pState);
+ float128_t px2 = f128_mul(x2, p2m, pState);
+
+ if (f128_le(x2, zero, pState))
+ {
+ x1 = f128_sub(x1, px2, pState);
+ x2 = f128_add(x2, px1, pState);
+ z = f128_sub(z, atg, pState);
+ }
+ else
+ {
+ x1 = f128_add(x1, px2, pState);
+ x2 = f128_sub(x2, px1, pState);
+ z = f128_add(z, atg, pState);
+ }
+
+ p2m = f128_div(p2m, two, pState);
+
+ v1 = f128_mul(x1, scale, pState);
+ v2 = f128_mul(x2, scale, pState);
+ }
+
+ return z;
+}
+
+extFloat80_t extF80_sin( extFloat80_t x SOFTFLOAT_STATE_DECL_COMMA )
+{
+ int32_t fSign = 0;
+ extFloat80_t f80zero = ui32_to_extF80(0, pState);
+ if (extF80_le(x, f80zero, pState))
+ {
+ x = extF80_sub(f80zero, x, pState);
+ fSign = 1;
+ }
+
+ extFloat80_t f80pi2 = f128_to_extF80(*(float128_t *)&g_r128pi2, pState);
+
+ /** @todo TBD: Partial remainder should be calculated using float128 value of pi2 to increase precision **/
+ 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);
+
+ float128_t z = extF80_to_f128(rem, pState);
+ float128_t f128zero = ui32_to_f128(0, pState);
+
+ float128_t v1, v2;
+ cordic_sincos(z, &v1, &v2, pState);
+
+ float128_t v;
+ switch(quo % 4)
+ {
+#ifdef _MSC_VER /* stupid MSC thinks v might be used uninitialized otherwise: */
+ default:
+#endif
+ case 0:
+ v = v2;
+ break;
+
+ case 1:
+ v = v1;
+ break;
+
+ case 2:
+ v = f128_sub(f128zero, v2, pState);
+ break;
+
+ case 3:
+ v = f128_sub(f128zero, v1, pState);
+ break;
+ }
+
+ if (fSign)
+ v = f128_sub(f128zero, v, pState);
+
+ return f128_to_extF80(v, pState);
+}
+
+extFloat80_t extF80_cos( extFloat80_t x SOFTFLOAT_STATE_DECL_COMMA )
+{
+ extFloat80_t f80zero = ui32_to_extF80(0, pState);
+ if (extF80_le(x, f80zero, pState))
+ x = extF80_sub(f80zero, x, pState);
+
+ extFloat80_t f80pi2 = f128_to_extF80(*(float128_t *)&g_r128pi2, pState);
+
+ /** TBD: Partial remainder should be calculated using float128 value of pi2 to increase precision **/
+ 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);
+
+ float128_t z = extF80_to_f128(rem, pState);
+ float128_t f128zero = ui32_to_f128(0, pState);
+
+ float128_t v1, v2;
+ cordic_sincos(z, &v1, &v2, pState);
+
+ float128_t v;
+ switch(quo % 4)
+ {
+#ifdef _MSC_VER /* stupid MSC thinks v might be used uninitialized otherwise: */
+ default:
+#endif
+ case 0:
+ v = v1;
+ break;
+
+ case 1:
+ v = f128_sub(f128zero, v2, pState);;
+ break;
+
+ case 2:
+ v = f128_sub(f128zero, v1, pState);
+ break;
+
+ case 3:
+ v = v2;
+ break;
+ }
+
+ return f128_to_extF80(v, pState);
+}
+
+void extF80_sincos( extFloat80_t x, extFloat80_t* pSin, extFloat80_t* pCos SOFTFLOAT_STATE_DECL_COMMA )
+{
+ uint16_t fCxFlags = 0;
+ int32_t quo;
+ extFloat80_t rem, f80pi2, f80zero;
+ int32_t fSign = 0;
+
+ f80zero = ui32_to_extF80(0, pState);
+ if (extF80_le(x, f80zero, pState))
+ {
+ x = extF80_sub(f80zero, x, pState);
+ fSign = 1;
+ }
+
+ f80pi2 = f128_to_extF80(*(float128_t const *)&g_r128pi2, pState);
+
+ /** @todo TBD: Partial remainder should be calculated using float128 value of pi2 to increase precision **/
+ rem = extF80_partialRem(x, f80pi2, pState->roundingMode, &fCxFlags, pState);
+ quo = X86_FSW_CX_TO_QUOTIENT(fCxFlags);
+
+ float128_t z = extF80_to_f128(rem, pState);
+ float128_t f128zero = ui32_to_f128(0, pState);
+
+ float128_t v1, v2;
+ cordic_sincos(z, &v1, &v2, pState);
+
+ float128_t vCos, vSin;
+ switch(quo % 4)
+ {
+#ifdef _MSC_VER /* stupid MSC thinks vCos & cSin might be used uninitialized otherwise: */
+ default:
+#endif
+ case 0:
+ vCos = v1;
+ vSin = v2;
+ break;
+
+ case 1:
+ vCos = f128_sub(f128zero, v2, pState);
+ vSin = v1;
+ break;
+
+ case 2:
+ vCos = f128_sub(f128zero, v1, pState);
+ vSin = f128_sub(f128zero, v2, pState);
+ break;
+
+ case 3:
+ vCos = v2;
+ vSin = f128_sub(f128zero, v1, pState);
+ break;
+ }
+
+ if (fSign)
+ vSin = f128_sub(f128zero, vSin, pState);
+
+ *pCos = f128_to_extF80(vCos, pState);
+ *pSin = f128_to_extF80(vSin, pState);
+}
+
+extFloat80_t extF80_atan2( extFloat80_t f80y, extFloat80_t f80x SOFTFLOAT_STATE_DECL_COMMA )
+{
+ float128_t v;
+ int32_t fSignX = 0, fSignY = 0;
+ float128_t f128zero = ui32_to_f128(0, pState);
+ float128_t y = extF80_to_f128(f80y, pState);
+ float128_t x = extF80_to_f128(f80x, pState);
+
+ if (f128_le(x, f128zero, pState))
+ {
+ x = f128_sub(f128zero, x, pState);
+ fSignX = 1;
+ }
+
+ if (f128_le(y, f128zero, pState))
+ {
+ y = f128_sub(f128zero, y, pState);
+ fSignY = 1;
+ }
+
+ v = cordic_atan2(y, x, pState);
+
+ if (fSignX)
+ {
+ if (fSignY)
+ v = f128_sub(v, *(float128_t const *)&g_r128pi, pState);
+ else
+ v = f128_sub(*(float128_t const *)&g_r128pi, v, pState);
+ }
+ else
+ {
+ if (fSignY)
+ v = f128_sub(f128zero, v, pState);
+ }
+
+ return f128_to_extF80(v, pState);
+}
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