remove f128_sqrt unused for Bochs
This commit is contained in:
Stanislav Shwartsman
parent
0e686801a5
commit
807ae1f04c
@ -261,8 +261,7 @@ OBJS_OTHERS = \
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f128_addsub$(OBJ) \
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f128_mul$(OBJ) \
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f128_mulAdd$(OBJ) \
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f128_div$(OBJ) \
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f128_sqrt$(OBJ)
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f128_div$(OBJ)
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OBJS_ALL = $(OBJS_PRIMITIVES) $(OBJS_SPECIALIZE) $(OBJS_OTHERS)
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@ -1,193 +0,0 @@
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/*============================================================================
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This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
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Package, Release 3e, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the
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University of California. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=============================================================================*/
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#include <stdbool.h>
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#include <stdint.h>
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#include "internals.h"
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#include "specialize.h"
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#include "softfloat.h"
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float128_t f128_sqrt(float128_t a, struct softfloat_status_t *status)
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{
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uint64_t uiA64, uiA0;
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bool signA;
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int32_t expA;
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struct uint128 sigA, uiZ;
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struct exp32_sig128 normExpSig;
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int32_t expZ;
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uint32_t sig32A, recipSqrt32, sig32Z;
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struct uint128 rem;
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uint32_t qs[3];
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uint32_t q;
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uint64_t x64, sig64Z;
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struct uint128 y, term;
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uint64_t sigZExtra;
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struct uint128 sigZ;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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uiA64 = a.v64;
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uiA0 = a.v0;
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signA = signF128UI64(uiA64);
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expA = expF128UI64(uiA64);
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sigA.v64 = fracF128UI64(uiA64);
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sigA.v0 = uiA0;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if (expA == 0x7FFF) {
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if (sigA.v64 | sigA.v0) {
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uiZ = softfloat_propagateNaNF128UI(uiA64, uiA0, 0, 0, status);
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return uiZ;
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}
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if (! signA) return a;
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goto invalid;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if (signA) {
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if (! (expA | sigA.v64 | sigA.v0)) return a;
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goto invalid;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if (! expA) {
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if (! (sigA.v64 | sigA.v0)) return a;
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softfloat_raiseFlags(status, softfloat_flag_denormal);
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normExpSig = softfloat_normSubnormalF128Sig(sigA.v64, sigA.v0);
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expA = normExpSig.exp;
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sigA = normExpSig.sig;
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}
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/*------------------------------------------------------------------------
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| (`sig32Z' is guaranteed to be a lower bound on the square root of
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| `sig32A', which makes `sig32Z' also a lower bound on the square root of
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| `sigA'.)
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*------------------------------------------------------------------------*/
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expZ = ((expA - 0x3FFF)>>1) + 0x3FFE;
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expA &= 1;
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sigA.v64 |= UINT64_C(0x0001000000000000);
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sig32A = sigA.v64>>17;
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recipSqrt32 = softfloat_approxRecipSqrt32_1(expA, sig32A);
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sig32Z = ((uint64_t) sig32A * recipSqrt32)>>32;
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if (expA) {
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sig32Z >>= 1;
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rem = softfloat_shortShiftLeft128(sigA.v64, sigA.v0, 12);
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} else {
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rem = softfloat_shortShiftLeft128(sigA.v64, sigA.v0, 13);
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}
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qs[2] = sig32Z;
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rem.v64 -= (uint64_t) sig32Z * sig32Z;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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q = ((uint32_t) (rem.v64>>2) * (uint64_t) recipSqrt32)>>32;
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x64 = (uint64_t) sig32Z<<32;
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sig64Z = x64 + ((uint64_t) q<<3);
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y = softfloat_shortShiftLeft128(rem.v64, rem.v0, 29);
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/*------------------------------------------------------------------------
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| (Repeating this loop is a rare occurrence.)
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*------------------------------------------------------------------------*/
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for (;;) {
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term = softfloat_mul64ByShifted32To128(x64 + sig64Z, q);
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rem = softfloat_sub128(y.v64, y.v0, term.v64, term.v0);
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if (! (rem.v64 & UINT64_C(0x8000000000000000))) break;
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--q;
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sig64Z -= 1<<3;
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}
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qs[1] = q;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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q = ((rem.v64>>2) * recipSqrt32)>>32;
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y = softfloat_shortShiftLeft128(rem.v64, rem.v0, 29);
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sig64Z <<= 1;
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/*------------------------------------------------------------------------
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| (Repeating this loop is a rare occurrence.)
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*------------------------------------------------------------------------*/
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for (;;) {
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term = softfloat_shortShiftLeft128(0, sig64Z, 32);
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term = softfloat_add128(term.v64, term.v0, 0, (uint64_t) q<<6);
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term = softfloat_mul128By32(term.v64, term.v0, q);
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rem = softfloat_sub128(y.v64, y.v0, term.v64, term.v0);
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if (! (rem.v64 & UINT64_C(0x8000000000000000))) break;
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--q;
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}
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qs[0] = q;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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q = (((rem.v64>>2) * recipSqrt32)>>32) + 2;
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sigZExtra = (uint64_t) ((uint64_t) q<<59);
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term = softfloat_shortShiftLeft128(0, qs[1], 53);
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sigZ =
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softfloat_add128(
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(uint64_t) qs[2]<<18, ((uint64_t) qs[0]<<24) + (q>>5),
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term.v64, term.v0
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);
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if ((q & 0xF) <= 2) {
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q &= ~3;
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sigZExtra = (uint64_t) ((uint64_t) q<<59);
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y = softfloat_shortShiftLeft128(sigZ.v64, sigZ.v0, 6);
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y.v0 |= sigZExtra>>58;
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term = softfloat_sub128(y.v64, y.v0, 0, q);
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y = softfloat_mul64ByShifted32To128(term.v0, q);
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term = softfloat_mul64ByShifted32To128(term.v64, q);
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term = softfloat_add128(term.v64, term.v0, 0, y.v64);
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rem = softfloat_shortShiftLeft128(rem.v64, rem.v0, 20);
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term = softfloat_sub128(term.v64, term.v0, rem.v64, rem.v0);
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/*--------------------------------------------------------------------
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| The concatenation of `term' and `y.v0' is now the negative remainder
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| (3 words altogether).
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*--------------------------------------------------------------------*/
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if (term.v64 & UINT64_C(0x8000000000000000)) {
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sigZExtra |= 1;
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} else {
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if (term.v64 | term.v0 | y.v0) {
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if (sigZExtra) {
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--sigZExtra;
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} else {
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sigZ = softfloat_sub128(sigZ.v64, sigZ.v0, 0, 1);
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sigZExtra = ~0;
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}
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}
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}
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}
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return softfloat_roundPackToF128(0, expZ, sigZ.v64, sigZ.v0, sigZExtra, status);
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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invalid:
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softfloat_raiseFlags(status, softfloat_flag_invalid);
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uiZ.v64 = defaultNaNF128UI64;
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uiZ.v0 = defaultNaNF128UI0;
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return uiZ;
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}
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