| /***************************************************************************** |
| |
| Licensed to Accellera Systems Initiative Inc. (Accellera) under one or |
| more contributor license agreements. See the NOTICE file distributed |
| with this work for additional information regarding copyright ownership. |
| Accellera licenses this file to you under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with the |
| License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| implied. See the License for the specific language governing |
| permissions and limitations under the License. |
| |
| *****************************************************************************/ |
| |
| /***************************************************************************** |
| |
| sc_fxnum.cpp - |
| |
| Original Author: Martin Janssen, Synopsys, Inc. |
| |
| *****************************************************************************/ |
| |
| /***************************************************************************** |
| |
| MODIFICATION LOG - modifiers, enter your name, affiliation, date and |
| changes you are making here. |
| |
| Name, Affiliation, Date: |
| Description of Modification: |
| |
| *****************************************************************************/ |
| |
| |
| // $Log: sc_fxnum.cpp,v $ |
| // Revision 1.3 2011/01/19 18:57:40 acg |
| // Andy Goodrich: changes for IEEE_1666_2011. |
| // |
| // Revision 1.2 2010/12/07 20:09:08 acg |
| // Andy Goodrich: Philipp Hartmann's constructor disambiguation fix |
| // |
| // Revision 1.1.1.1 2006/12/15 20:20:04 acg |
| // SystemC 2.3 |
| // |
| // Revision 1.3 2006/01/13 18:53:57 acg |
| // Andy Goodrich: added $Log command so that CVS comments are reproduced in |
| // the source. |
| // |
| |
| #include <cmath> |
| |
| #include "systemc/ext/dt/fx/messages.hh" |
| #include "systemc/ext/dt/fx/sc_fxnum.hh" |
| |
| namespace sc_dt |
| { |
| |
| // ---------------------------------------------------------------------------- |
| // CLASS : sc_fxnum_bitref |
| // |
| // Proxy class for bit-selection in class sc_fxnum, behaves like sc_bit. |
| // ---------------------------------------------------------------------------- |
| |
| bool sc_fxnum_bitref::get() const { return m_num.get_bit(m_idx); } |
| void sc_fxnum_bitref::set(bool high) { m_num.set_bit(m_idx, high); } |
| |
| // print or dump content |
| void sc_fxnum_bitref::print(::std::ostream &os) const { os << get(); } |
| |
| void |
| sc_fxnum_bitref::scan(::std::istream &is) |
| { |
| bool b; |
| is >> b; |
| *this = b; |
| } |
| |
| void |
| sc_fxnum_bitref::dump(::std::ostream &os) const |
| { |
| os << "sc_fxnum_bitref" << ::std::endl; |
| os << "(" << ::std::endl; |
| os << "num = "; |
| m_num.dump(os); |
| os << "idx = " << m_idx << ::std::endl; |
| os << ")" << ::std::endl; |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // CLASS : sc_fxnum_fast_bitref |
| // |
| // Proxy class for bit-selection in class sc_fxnum_fast, behaves like sc_bit. |
| // ---------------------------------------------------------------------------- |
| |
| bool sc_fxnum_fast_bitref::get() const { return m_num.get_bit(m_idx); } |
| void sc_fxnum_fast_bitref::set(bool high) { m_num.set_bit(m_idx, high); } |
| |
| // print or dump content |
| void sc_fxnum_fast_bitref::print(::std::ostream &os) const { os << get(); } |
| |
| void |
| sc_fxnum_fast_bitref::scan(::std::istream &is) |
| { |
| bool b; |
| is >> b; |
| *this = b; |
| } |
| |
| void |
| sc_fxnum_fast_bitref::dump(::std::ostream &os) const |
| { |
| os << "sc_fxnum_fast_bitref" << ::std::endl; |
| os << "(" << ::std::endl; |
| os << "num = "; |
| m_num.dump(os); |
| os << "idx = " << m_idx << ::std::endl; |
| os << ")" << ::std::endl; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // CLASS : sc_fxnum_subref |
| // |
| // Proxy class for part-selection in class sc_fxnum, |
| // behaves like sc_bv_base. |
| // ---------------------------------------------------------------------------- |
| |
| bool |
| sc_fxnum_subref::get() const |
| { |
| return m_num.get_slice(m_from, m_to, m_bv); |
| } |
| |
| bool |
| sc_fxnum_subref::set() |
| { |
| return m_num.set_slice(m_from, m_to, m_bv); |
| } |
| |
| // print or dump content |
| void |
| sc_fxnum_subref::print(::std::ostream &os) const |
| { |
| get(); |
| m_bv.print(os); |
| } |
| |
| void |
| sc_fxnum_subref::scan(::std::istream &is) |
| { |
| m_bv.scan(is); |
| set(); |
| } |
| |
| void |
| sc_fxnum_subref::dump(::std::ostream &os) const |
| { |
| os << "sc_fxnum_subref" << ::std::endl; |
| os << "(" << ::std::endl; |
| os << "num = "; |
| m_num.dump(os); |
| os << "from = " << m_from << ::std::endl; |
| os << "to = " << m_to << ::std::endl; |
| os << ")" << ::std::endl; |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // CLASS : sc_fxnum_fast_subref |
| // |
| // Proxy class for part-selection in class sc_fxnum_fast, |
| // behaves like sc_bv_base. |
| // ---------------------------------------------------------------------------- |
| |
| bool |
| sc_fxnum_fast_subref::get() const |
| { |
| return m_num.get_slice(m_from, m_to, m_bv); |
| } |
| |
| bool |
| sc_fxnum_fast_subref::set() |
| { |
| return m_num.set_slice(m_from, m_to, m_bv); |
| } |
| |
| // print or dump content |
| void |
| sc_fxnum_fast_subref::print(::std::ostream &os) const |
| { |
| get(); |
| m_bv.print(os); |
| } |
| |
| void |
| sc_fxnum_fast_subref::scan(::std::istream &is) |
| { |
| m_bv.scan(is); |
| set(); |
| } |
| |
| void |
| sc_fxnum_fast_subref::dump(::std::ostream &os) const |
| { |
| os << "sc_fxnum_fast_subref" << ::std::endl; |
| os << "(" << ::std::endl; |
| os << "num = "; |
| m_num.dump(os); |
| os << "from = " << m_from << ::std::endl; |
| os << "to = " << m_to << ::std::endl; |
| os << ")" << ::std::endl; |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // CLASS : sc_fxnum |
| // |
| // Base class for the fixed-point types; arbitrary precision. |
| // ---------------------------------------------------------------------------- |
| |
| // explicit conversion to character string |
| |
| const std::string |
| sc_fxnum::to_string() const |
| { |
| return std::string(m_rep->to_string(SC_DEC, -1, SC_F, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum::to_string(sc_numrep numrep) const |
| { |
| return std::string(m_rep->to_string(numrep, -1, SC_F, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum::to_string(sc_numrep numrep, bool w_prefix) const |
| { |
| return std::string(m_rep->to_string(numrep, (w_prefix ? 1 : 0), |
| SC_F, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum::to_string(sc_fmt fmt) const |
| { |
| return std::string(m_rep->to_string(SC_DEC, -1, fmt, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum::to_string(sc_numrep numrep, sc_fmt fmt) const |
| { |
| return std::string(m_rep->to_string(numrep, -1, fmt, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum::to_string(sc_numrep numrep, bool w_prefix, sc_fmt fmt) const |
| { |
| return std::string(m_rep->to_string(numrep, (w_prefix ? 1 : 0), |
| fmt, &m_params)); |
| } |
| |
| |
| const std::string |
| sc_fxnum::to_dec() const |
| { |
| return std::string(m_rep->to_string(SC_DEC, -1, SC_F, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum::to_bin() const |
| { |
| return std::string(m_rep->to_string(SC_BIN, -1, SC_F, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum::to_oct() const |
| { |
| return std::string(m_rep->to_string(SC_OCT, -1, SC_F, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum::to_hex() const |
| { |
| return std::string(m_rep->to_string(SC_HEX, -1, SC_F, &m_params)); |
| } |
| |
| |
| // print or dump content |
| void |
| sc_fxnum::print(::std::ostream &os) const |
| { |
| os << m_rep->to_string(SC_DEC, -1, SC_F, &m_params); |
| } |
| |
| void |
| sc_fxnum::scan(::std::istream &is) |
| { |
| std::string s; |
| is >> s; |
| *this = s.c_str(); |
| } |
| |
| void |
| sc_fxnum::dump(::std::ostream &os) const |
| { |
| os << "sc_fxnum" << ::std::endl; |
| os << "(" << ::std::endl; |
| os << "rep = "; |
| m_rep->dump(os); |
| os << "params = "; |
| m_params.dump(os); |
| os << "q_flag = " << m_q_flag << ::std::endl; |
| os << "o_flag = " << m_o_flag << ::std::endl; |
| // TO BE COMPLETED |
| // os << "observer = "; |
| // if (m_observer != 0) |
| // m_observer->dump(os); |
| // else |
| // os << "0" << ::std::endl; |
| os << ")" << ::std::endl; |
| } |
| |
| |
| sc_fxnum_observer * |
| sc_fxnum::lock_observer() const |
| { |
| SC_ASSERT_(m_observer != 0, "lock observer failed"); |
| sc_fxnum_observer * tmp = m_observer; |
| m_observer = 0; |
| return tmp; |
| } |
| |
| void |
| sc_fxnum::unlock_observer(sc_fxnum_observer *observer_) const |
| { |
| SC_ASSERT_(observer_ != 0, "unlock observer failed"); |
| m_observer = observer_; |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // CLASS : sc_fxnum_fast |
| // |
| // Base class for the fixed-point types; limited precision. |
| // ---------------------------------------------------------------------------- |
| |
| static void |
| quantization(double &c, const scfx_params ¶ms, bool &q_flag) |
| { |
| int fwl = params.wl() - params.iwl(); |
| double scale = scfx_pow2(fwl); |
| double val = scale * c; |
| double int_part; |
| double frac_part = modf(val, &int_part); |
| |
| q_flag = (frac_part != 0.0); |
| |
| if (q_flag) { |
| val = int_part; |
| |
| switch (params.q_mode()) { |
| case SC_TRN: // truncation |
| { |
| if (c < 0.0) |
| val -= 1.0; |
| break; |
| } |
| case SC_RND: // rounding to plus infinity |
| { |
| if (frac_part >= 0.5) |
| val += 1.0; |
| else if (frac_part < -0.5) |
| val -= 1.0; |
| break; |
| } |
| case SC_TRN_ZERO: // truncation to zero |
| { |
| break; |
| } |
| case SC_RND_INF: // rounding to infinity |
| { |
| if (frac_part >= 0.5) |
| val += 1.0; |
| else if (frac_part <= -0.5) |
| val -= 1.0; |
| break; |
| } |
| case SC_RND_CONV: // convergent rounding |
| { |
| if (frac_part > 0.5 || |
| (frac_part == 0.5 && fmod(int_part, 2.0) != 0.0)) { |
| val += 1.0; |
| } else if (frac_part < -0.5 || |
| (frac_part == -0.5 && fmod(int_part, 2.0) != 0.0)) { |
| val -= 1.0; |
| } |
| break; |
| } |
| case SC_RND_ZERO: // rounding to zero |
| { |
| if (frac_part > 0.5) |
| val += 1.0; |
| else if (frac_part < -0.5) |
| val -= 1.0; |
| break; |
| } |
| case SC_RND_MIN_INF: // rounding to minus infinity |
| { |
| if (frac_part > 0.5) |
| val += 1.0; |
| else if (frac_part <= -0.5) |
| val -= 1.0; |
| break; |
| } |
| default: |
| ; |
| } |
| } |
| |
| val /= scale; |
| c = val; |
| } |
| |
| static void |
| overflow(double &c, const scfx_params ¶ms, bool &o_flag) |
| { |
| int iwl = params.iwl(); |
| int fwl = params.wl() - iwl; |
| double full_circle = scfx_pow2(iwl); |
| double resolution = scfx_pow2(-fwl); |
| double low, high; |
| if (params.enc() == SC_TC_) { |
| high = full_circle / 2.0 - resolution; |
| if (params.o_mode() == SC_SAT_SYM) |
| low = - high; |
| else |
| low = - full_circle / 2.0; |
| } else { |
| low = 0.0; |
| high = full_circle - resolution; |
| } |
| double val = c; |
| sc_fxval_fast c2(c); |
| |
| bool under = (val < low); |
| bool over = (val > high); |
| |
| o_flag = (under || over); |
| |
| if (o_flag) { |
| switch (params.o_mode()) { |
| case SC_WRAP: // wrap-around |
| { |
| int n_bits = params.n_bits(); |
| |
| if (n_bits == 0) { |
| // wrap-around all 'wl' bits |
| val -= floor(val / full_circle) * full_circle; |
| if (val > high) |
| val -= full_circle; |
| } else if (n_bits < params.wl()) { |
| double X = scfx_pow2(iwl - n_bits); |
| |
| // wrap-around least significant 'wl - n_bits' bits |
| val -= floor(val / X) * X; |
| if (val > (X - resolution)) |
| val -= X; |
| |
| // saturate most significant 'n_bits' bits |
| if (under) { |
| val += low; |
| } else { |
| if (params.enc() == SC_TC_) |
| val += full_circle / 2.0 - X; |
| else |
| val += full_circle - X; |
| } |
| } else { |
| // saturate all 'wl' bits |
| if (under) |
| val = low; |
| else |
| val = high; |
| } |
| break; |
| } |
| case SC_SAT: // saturation |
| case SC_SAT_SYM: // symmetrical saturation |
| { |
| if (under) |
| val = low; |
| else |
| val = high; |
| break; |
| } |
| case SC_SAT_ZERO: // saturation to zero |
| { |
| val = 0.0; |
| break; |
| } |
| case SC_WRAP_SM: // sign magnitude wrap-around |
| { |
| SC_ERROR_IF_(params.enc() == SC_US_, |
| sc_core::SC_ID_WRAP_SM_NOT_DEFINED_); |
| |
| int n_bits = params.n_bits(); |
| |
| if (n_bits == 0) { |
| // invert conditionally |
| if (c2.get_bit(iwl) != c2.get_bit(iwl - 1)) |
| val = -val - resolution; |
| |
| // wrap-around all 'wl' bits |
| val -= floor(val / full_circle) * full_circle; |
| if (val > high) |
| val -= full_circle; |
| } else if (n_bits == 1) { |
| // invert conditionally |
| if (c2.is_neg() != c2.get_bit(iwl - 1)) |
| val = -val - resolution; |
| |
| // wrap-around all 'wl' bits |
| val -= floor(val / full_circle) * full_circle; |
| if (val > high) |
| val -= full_circle; |
| } else if (n_bits < params.wl()) { |
| // invert conditionally |
| if (c2.is_neg() == c2.get_bit(iwl - n_bits)) |
| val = -val - resolution; |
| |
| double X = scfx_pow2(iwl - n_bits); |
| |
| // wrap-around least significant 'wl - n_bits' bits |
| val -= floor(val / X) * X; |
| if (val > (X - resolution)) |
| val -= X; |
| |
| // saturate most significant 'n_bits' bits |
| if (under) |
| val += low; |
| else |
| val += full_circle / 2.0 - X; |
| } else { |
| // saturate all 'wl' bits |
| if (under) |
| val = low; |
| else |
| val = high; |
| } |
| break; |
| } |
| default: |
| ; |
| } |
| |
| c = val; |
| } |
| } |
| |
| |
| void |
| sc_fxnum_fast::cast() |
| { |
| scfx_ieee_double id(m_val); |
| SC_ERROR_IF_(id.is_nan() || id.is_inf(), sc_core::SC_ID_INVALID_FX_VALUE_); |
| |
| if (m_params.cast_switch() == SC_ON) { |
| m_q_flag = false; |
| m_o_flag = false; |
| |
| // check for special cases |
| |
| if (id.is_zero()) { |
| if (id.negative() != 0) |
| m_val = -m_val; |
| return; |
| } |
| |
| // perform casting |
| sc_dt::quantization(m_val, m_params, m_q_flag); |
| sc_dt::overflow(m_val, m_params, m_o_flag); |
| |
| // check for special case: -0 |
| id = m_val; |
| if (id.is_zero() && id.negative() != 0) { |
| m_val = -m_val; |
| } |
| |
| // check for special case: NaN of Inf |
| if (id.is_nan() || id.is_inf()) { |
| m_val = 0.0; |
| } |
| } |
| } |
| |
| |
| // defined in sc_fxval.cpp; |
| extern const char* to_string(const scfx_ieee_double &, sc_numrep, int, sc_fmt, |
| const scfx_params * =0); |
| |
| |
| // explicit conversion to character string |
| |
| const std::string |
| sc_fxnum_fast::to_string() const |
| { |
| return std::string(sc_dt::to_string(m_val, SC_DEC, -1, SC_F, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum_fast::to_string(sc_numrep numrep) const |
| { |
| return std::string(sc_dt::to_string(m_val, numrep, -1, SC_F, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum_fast::to_string(sc_numrep numrep, bool w_prefix) const |
| { |
| return std::string(sc_dt::to_string(m_val, numrep, (w_prefix ? 1 : 0), |
| SC_F, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum_fast::to_string(sc_fmt fmt) const |
| { |
| return std::string(sc_dt::to_string(m_val, SC_DEC, -1, fmt, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum_fast::to_string(sc_numrep numrep, sc_fmt fmt) const |
| { |
| return std::string(sc_dt::to_string(m_val, numrep, -1, fmt, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum_fast::to_string(sc_numrep numrep, bool w_prefix, sc_fmt fmt) const |
| { |
| return std::string(sc_dt::to_string(m_val, numrep, (w_prefix ? 1 : 0), |
| fmt, &m_params)); |
| } |
| |
| |
| const std::string |
| sc_fxnum_fast::to_dec() const |
| { |
| return std::string(sc_dt::to_string(m_val, SC_DEC, -1, SC_F, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum_fast::to_bin() const |
| { |
| return std::string(sc_dt::to_string(m_val, SC_BIN, -1, SC_F, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum_fast::to_oct() const |
| { |
| return std::string(sc_dt::to_string(m_val, SC_OCT, -1, SC_F, &m_params)); |
| } |
| |
| const std::string |
| sc_fxnum_fast::to_hex() const |
| { |
| return std::string(sc_dt::to_string(m_val, SC_HEX, -1, SC_F, &m_params)); |
| } |
| |
| // print or dump content |
| void |
| sc_fxnum_fast::print(::std::ostream &os) const |
| { |
| os << sc_dt::to_string(m_val, SC_DEC, -1, SC_F, &m_params); |
| } |
| |
| void |
| sc_fxnum_fast::scan(::std::istream &is) |
| { |
| std::string s; |
| is >> s; |
| *this = s.c_str(); |
| } |
| |
| void |
| sc_fxnum_fast::dump(::std::ostream &os) const |
| { |
| os << "sc_fxnum_fast" << ::std::endl; |
| os << "(" << ::std::endl; |
| os << "val = " << m_val << ::std::endl; |
| os << "params = "; |
| m_params.dump(os); |
| os << "q_flag = " << m_q_flag << ::std::endl; |
| os << "o_flag = " << m_o_flag << ::std::endl; |
| // TO BE COMPLETED |
| // os << "observer = "; |
| // if (m_observer != 0) |
| // m_observer->dump(os); |
| // else |
| // os << "0" << ::std::endl; |
| os << ")" << ::std::endl; |
| } |
| |
| // internal use only; |
| bool |
| sc_fxnum_fast::get_bit(int i) const |
| { |
| scfx_ieee_double id(m_val); |
| if (id.is_zero() || id.is_nan() || id.is_inf()) |
| return false; |
| |
| // convert to two's complement |
| unsigned int m0 = id.mantissa0(); |
| unsigned int m1 = id.mantissa1(); |
| |
| if (id.is_normal()) |
| m0 += 1U << 20; |
| |
| if (id.negative() != 0) { |
| m0 = ~ m0; |
| m1 = ~ m1; |
| unsigned int tmp = m1; |
| m1 += 1U; |
| if (m1 <= tmp) |
| m0 += 1U; |
| } |
| |
| // get the right bit |
| int j = i - id.exponent(); |
| if ((j += 20) >= 32) |
| return ((m0 & 1U << 31) != 0); |
| else if (j >= 0) |
| return ((m0 & 1U << j) != 0); |
| else if ((j += 32) >= 0) |
| return ((m1 & 1U << j) != 0); |
| else |
| return false; |
| } |
| |
| |
| bool |
| sc_fxnum_fast::set_bit(int i, bool high) |
| { |
| scfx_ieee_double id(m_val); |
| if (id.is_nan() || id.is_inf()) |
| return false; |
| |
| if (high) { |
| if (get_bit(i)) |
| return true; |
| |
| if (m_params.enc() == SC_TC_ && i == m_params.iwl() - 1) |
| m_val -= scfx_pow2(i); |
| else |
| m_val += scfx_pow2(i); |
| } else { |
| if (!get_bit(i)) |
| return true; |
| |
| if (m_params.enc() == SC_TC_ && i == m_params.iwl() - 1) |
| m_val += scfx_pow2(i); |
| else |
| m_val -= scfx_pow2(i); |
| } |
| |
| return true; |
| } |
| |
| |
| bool |
| sc_fxnum_fast::get_slice(int i, int j, sc_bv_base &bv) const |
| { |
| scfx_ieee_double id(m_val); |
| if (id.is_nan() || id.is_inf()) |
| return false; |
| |
| // convert to two's complement |
| unsigned int m0 = id.mantissa0(); |
| unsigned int m1 = id.mantissa1(); |
| |
| if (id.is_normal()) |
| m0 += 1U << 20; |
| |
| if (id.negative() != 0) { |
| m0 = ~ m0; |
| m1 = ~ m1; |
| unsigned int tmp = m1; |
| m1 += 1U; |
| if (m1 <= tmp) |
| m0 += 1U; |
| } |
| |
| // get the bits |
| int l = j; |
| for (int k = 0; k < bv.length(); ++ k) { |
| bool b = false; |
| |
| int n = l - id.exponent(); |
| if ((n += 20) >= 32) |
| b = ((m0 & 1U << 31) != 0); |
| else if (n >= 0) |
| b = ((m0 & 1U << n) != 0); |
| else if ((n += 32) >= 0) |
| b = ((m1 & 1U << n) != 0); |
| |
| bv[k] = b; |
| |
| if (i >= j) |
| ++l; |
| else |
| --l; |
| } |
| |
| return true; |
| } |
| |
| bool |
| sc_fxnum_fast::set_slice(int i, int j, const sc_bv_base &bv) |
| { |
| scfx_ieee_double id(m_val); |
| if (id.is_nan() || id.is_inf()) |
| return false; |
| |
| // set the bits |
| int l = j; |
| for (int k = 0; k < bv.length(); ++k) { |
| if (bv[k].to_bool()) { |
| if (!get_bit(l)) { |
| if (m_params.enc() == SC_TC_ && l == m_params.iwl() - 1) |
| m_val -= scfx_pow2(l); |
| else |
| m_val += scfx_pow2(l); |
| } |
| } else { |
| if (get_bit(l)) { |
| if (m_params.enc() == SC_TC_ && l == m_params.iwl() - 1) |
| m_val += scfx_pow2(l); |
| else |
| m_val -= scfx_pow2(l); |
| } |
| } |
| |
| if (i >= j) |
| ++l; |
| else |
| --l; |
| } |
| |
| return true; |
| } |
| |
| sc_fxnum_fast_observer * |
| sc_fxnum_fast::lock_observer() const |
| { |
| SC_ASSERT_(m_observer != 0, "lock observer failed"); |
| sc_fxnum_fast_observer *tmp = m_observer; |
| m_observer = 0; |
| return tmp; |
| } |
| |
| void |
| sc_fxnum_fast::unlock_observer(sc_fxnum_fast_observer *observer_) const |
| { |
| SC_ASSERT_(observer_ != 0, "unlock observer failed"); |
| m_observer = observer_; |
| } |
| |
| } // namespace sc_dt |
