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-rw-r--r--3rdparty/softfloat3/bochs_ext/extF80_scale.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/3rdparty/softfloat3/bochs_ext/extF80_scale.c b/3rdparty/softfloat3/bochs_ext/extF80_scale.c
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+++ b/3rdparty/softfloat3/bochs_ext/extF80_scale.c
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+/*============================================================================
+
+This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3e, by John R. Hauser.
+
+Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of
+California. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+ this list of conditions, and the following disclaimer.
+
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions, and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+
+ 3. Neither the name of the University nor the names of its contributors may
+ be used to endorse or promote products derived from this software without
+ specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
+EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
+DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+=============================================================================*/
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "../source/include/softfloat.h"
+#include "../source/include/internals.h"
+#include "../source/8086/specialize.h"
+
+#include "fpu_constant.h"
+#include "softfloat-helpers.h"
+#include "softfloat-extra.h"
+#include "softfloat-specialize.h"
+
+/*----------------------------------------------------------------------------
+| Scales extended double-precision floating-point value in operand `a' by
+| value `b'. The function truncates the value in the second operand 'b' to
+| an integral value and adds that value to the exponent of the operand 'a'.
+| The operation performed according to the IEC/IEEE Standard for Binary
+| Floating-Point Arithmetic.
+*----------------------------------------------------------------------------*/
+
+extFloat80_t extFloat80_scale(extFloat80_t a, extFloat80_t b)
+{
+ uint16_t uiA64;
+ uint64_t uiA0;
+ bool signA;
+ int32_t expA;
+ uint64_t sigA;
+ uint16_t uiB64;
+ uint64_t uiB0;
+ bool signB;
+ int32_t expB;
+ uint64_t sigB;
+ struct exp32_sig64 normExpSig;
+
+ // handle unsupported extended double-precision floating encodings
+ if (extF80_isUnsupported(a) || extF80_isUnsupported(b)) {
+invalid:
+ softfloat_exceptionFlags |= softfloat_flag_invalid;
+ return packToExtF80(defaultNaNExtF80UI64, defaultNaNExtF80UI0);
+ }
+
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ uiA64 = a.signExp;
+ uiA0 = a.signif;
+ signA = signExtF80UI64(uiA64);
+ expA = expExtF80UI64(uiA64);
+ sigA = uiA0;
+ uiB64 = b.signExp;
+ uiB0 = b.signif;
+ signB = signExtF80UI64(uiB64);
+ expB = expExtF80UI64(uiB64);
+ sigB = uiB0;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+
+ if (expA == 0x7FFF) {
+ if ((sigA<<1) || ((expB == 0x7FFF) && (sigB<<1))) {
+ const uint128 nan = softfloat_propagateNaNExtF80UI(uiA64, uiA0, uiB64, uiB0);
+ extFloat80_t rv;
+ rv.signExp = nan.v64;
+ rv.signif = nan.v0;
+ return rv;
+ }
+ if ((expB == 0x7FFF) && signB) goto invalid;
+ if (sigB && !expB)
+ softfloat_exceptionFlags |= softfloat_flag_invalid; // actally denormal
+
+ return a;
+ }
+ if (expB == 0x7FFF) {
+ if (sigB<<1) {
+ const uint128 nan = softfloat_propagateNaNExtF80UI(uiA64, uiA0, uiB64, uiB0);
+ extFloat80_t rv;
+ rv.signExp = nan.v64;
+ rv.signif = nan.v0;
+ return rv;
+ }
+ if ((expA | sigA) == 0) {
+ if (! signB) goto invalid;
+ return a;
+ }
+ if (sigA && !expA)
+ softfloat_exceptionFlags |= softfloat_flag_invalid; // actually denormal
+
+ if (signB) return packToExtF80(signA, 0, 0);
+ return packToExtF80(signA, 0x7FFF, uint64_t(0x8000000000000000));
+ }
+ if (! expA) {
+ if (sigB && !expB)
+ softfloat_exceptionFlags |= softfloat_flag_invalid; // actually denormal
+ if (! sigA) return a;
+ softfloat_exceptionFlags |= softfloat_flag_invalid; // actually denormal
+ normExpSig = softfloat_normSubnormalExtF80Sig(sigA);
+ expA = normExpSig.exp + 1;
+ sigA = normExpSig.sig;
+ if (expB < 0x3FFF)
+ return softfloat_normRoundPackToExtF80(signA, expA, sigA, 0, 80);
+ }
+ if (!expB) {
+ if (!sigB) return a;
+ softfloat_exceptionFlags |= softfloat_flag_invalid; // actually denormal
+ normExpSig = softfloat_normSubnormalExtF80Sig(sigB);
+ expB = normExpSig.exp + 1;
+ sigB = normExpSig.sig;
+ }
+
+ if (expB > 0x400E) {
+ /* generate appropriate overflow/underflow */
+ return softfloat_roundPackToExtF80(signA, signB ? -0x3FFF : 0x7FFF, sigA, 0, 80);
+ }
+
+ if (expB < 0x3FFF) return a;
+
+ int shiftCount = 0x403E - expB;
+ sigB >>= shiftCount;
+ int32_t scale = (int32_t) sigB;
+ if (signB) scale = -scale; /* -32768..32767 */
+
+ return softfloat_roundPackToExtF80(signA, expA + scale, sigA, 0, 80);
+}