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119 lines
4.3 KiB
C
119 lines
4.3 KiB
C
/*
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* Copyright (C) 2008-2020 Advanced Micro Devices, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* 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 copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY 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 DISCLAIMED.
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "libm.h"
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#include "libm_util.h"
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#include "libm_new.h"
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#define FN_PROTOTYPE_REF FN_PROTOTYPE
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#define __amd_handle_errorf _handle_errorf
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#define __amd_ldexp OP_LDEXP
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//#include "fn_macros.h"
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//#include "libm_util_amd.h"
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//#include "libm_special.h"
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float FN_PROTOTYPE_REF(ldexpf)(float x, int n)
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{
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UT32 val,val_x;
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unsigned int sign;
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int exponent;
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val.f32 = x;
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val_x.f32 = x;
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sign = val.u32 & 0x80000000;
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val.u32 = val.u32 & 0x7fffffff;/* remove the sign bit */
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if(val.u32 > 0x7f800000)/* x= nan */
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#ifdef WINDOWS
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return __amd_handle_errorf("ldexpf", __amd_ldexp, val_x.u32|0x00400000, _DOMAIN, 0, EDOM, x, (float)n, 2);
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#else
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{
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if(!(val.u32 & 0x00400000)) //x is snan
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return __amd_handle_errorf("ldexpf", __amd_ldexp, val_x.u32|0x00400000, _DOMAIN, AMD_F_INVALID, EDOM, x, (float)n, 2);
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else
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return x;
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}
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#endif
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if(val.u32 == 0x7f800000)/* x = +-inf*/
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return x;
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if((val.u32 == 0x00000000) || (n==0))/* x= +-0 or n= 0*/
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return x;
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exponent = val.u32 >> 23; /* get the exponent */
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if(exponent == 0)/*x is denormal*/
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{
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val.f32 = val.f32 * VAL_2PMULTIPLIER_SP;/*multiply by 2^24 to bring it to the normal range*/
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exponent = (val.u32 >> 23); /* get the exponent */
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exponent = exponent + n - MULTIPLIER_SP;
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if(exponent < -MULTIPLIER_SP)/*underflow*/
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{
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val.u32 = sign | 0x00000000;
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return __amd_handle_errorf("ldexpf", __amd_ldexp, val.u32, _UNDERFLOW, AMD_F_INEXACT|AMD_F_UNDERFLOW, ERANGE, x, (float)n, 2);
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}
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if(exponent > 254)/*overflow*/
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{
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val.u32 = sign | 0x7f800000;
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return __amd_handle_errorf("ldexpf", __amd_ldexp, val.u32, _OVERFLOW, AMD_F_INEXACT|AMD_F_OVERFLOW, ERANGE, x, (float)n, 2);
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}
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exponent += MULTIPLIER_SP;
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val.u32 = sign | (exponent << 23) | (val.u32 & 0x007fffff);
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val.f32 = val.f32 * VAL_2PMMULTIPLIER_SP;
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return val.f32;
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}
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exponent += n;
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if(exponent < -MULTIPLIER_SP)/*underflow*/
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{
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val.u32 = sign | 0x00000000;
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return __amd_handle_errorf("ldexpf", __amd_ldexp, val.u32, _UNDERFLOW, AMD_F_INEXACT|AMD_F_UNDERFLOW, ERANGE, x, (float)n, 2);
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}
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if(exponent < 1)/*x is normal but output is debnormal*/
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{
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exponent += MULTIPLIER_SP;
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val.u32 = sign | (exponent << 23) | (val.u32 & 0x007fffff);
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val.f32 = val.f32 * VAL_2PMMULTIPLIER_SP;
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return val.f32;
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}
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if(exponent > 254)/*overflow*/
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{
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val.u32 = sign | 0x7f800000;
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return __amd_handle_errorf("ldexpf", __amd_ldexp, val.u32, _OVERFLOW, AMD_F_INEXACT|AMD_F_OVERFLOW, ERANGE, x, (float)n, 2);
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}
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val.u32 = sign | (exponent << 23) | (val.u32 & 0x007fffff);/*x is normal and output is normal*/
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return val.f32;
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}
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