1 /* 2 * Copyright (C) 2008-2020 Advanced Micro Devices, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without modification, 5 * are permitted provided that the following conditions are met: 6 * 1. Redistributions of source code must retain the above copyright notice, 7 * this list of conditions and the following disclaimer. 8 * 2. Redistributions in binary form must reproduce the above copyright notice, 9 * this list of conditions and the following disclaimer in the documentation 10 * and/or other materials provided with the distribution. 11 * 3. Neither the name of the copyright holder nor the names of its contributors 12 * may be used to endorse or promote products derived from this software without 13 * specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 21 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 24 * POSSIBILITY OF SUCH DAMAGE. 25 * 26 */ 27 28 #include "libm.h" 29 #include "libm_util.h" 30 #include "libm_new.h" 31 32 #define FN_PROTOTYPE_REF FN_PROTOTYPE 33 #define __amd_handle_errorf _handle_errorf 34 #define __amd_ldexp OP_LDEXP 35 36 //#include "fn_macros.h" 37 //#include "libm_util_amd.h" 38 //#include "libm_special.h" 39 40 float FN_PROTOTYPE_REF(ldexpf)(float x, int n) 41 { 42 UT32 val,val_x; 43 unsigned int sign; 44 int exponent; 45 val.f32 = x; 46 val_x.f32 = x; 47 sign = val.u32 & 0x80000000; 48 val.u32 = val.u32 & 0x7fffffff;/* remove the sign bit */ 49 50 if(val.u32 > 0x7f800000)/* x= nan */ 51 #ifdef WINDOWS 52 return __amd_handle_errorf("ldexpf", __amd_ldexp, val_x.u32|0x00400000, _DOMAIN, 0, EDOM, x, (float)n, 2); 53 #else 54 { 55 if(!(val.u32 & 0x00400000)) //x is snan 56 return __amd_handle_errorf("ldexpf", __amd_ldexp, val_x.u32|0x00400000, _DOMAIN, AMD_F_INVALID, EDOM, x, (float)n, 2); 57 else 58 return x; 59 } 60 #endif 61 62 if(val.u32 == 0x7f800000)/* x = +-inf*/ 63 return x; 64 65 if((val.u32 == 0x00000000) || (n==0))/* x= +-0 or n= 0*/ 66 return x; 67 68 exponent = val.u32 >> 23; /* get the exponent */ 69 70 if(exponent == 0)/*x is denormal*/ 71 { 72 val.f32 = val.f32 * VAL_2PMULTIPLIER_SP;/*multiply by 2^24 to bring it to the normal range*/ 73 exponent = (val.u32 >> 23); /* get the exponent */ 74 exponent = exponent + n - MULTIPLIER_SP; 75 if(exponent < -MULTIPLIER_SP)/*underflow*/ 76 { 77 val.u32 = sign | 0x00000000; 78 return __amd_handle_errorf("ldexpf", __amd_ldexp, val.u32, _UNDERFLOW, AMD_F_INEXACT|AMD_F_UNDERFLOW, ERANGE, x, (float)n, 2); 79 } 80 if(exponent > 254)/*overflow*/ 81 { 82 val.u32 = sign | 0x7f800000; 83 return __amd_handle_errorf("ldexpf", __amd_ldexp, val.u32, _OVERFLOW, AMD_F_INEXACT|AMD_F_OVERFLOW, ERANGE, x, (float)n, 2); 84 } 85 86 exponent += MULTIPLIER_SP; 87 val.u32 = sign | (exponent << 23) | (val.u32 & 0x007fffff); 88 val.f32 = val.f32 * VAL_2PMMULTIPLIER_SP; 89 return val.f32; 90 } 91 92 exponent += n; 93 94 if(exponent < -MULTIPLIER_SP)/*underflow*/ 95 { 96 val.u32 = sign | 0x00000000; 97 return __amd_handle_errorf("ldexpf", __amd_ldexp, val.u32, _UNDERFLOW, AMD_F_INEXACT|AMD_F_UNDERFLOW, ERANGE, x, (float)n, 2); 98 } 99 100 if(exponent < 1)/*x is normal but output is debnormal*/ 101 { 102 exponent += MULTIPLIER_SP; 103 val.u32 = sign | (exponent << 23) | (val.u32 & 0x007fffff); 104 val.f32 = val.f32 * VAL_2PMMULTIPLIER_SP; 105 return val.f32; 106 } 107 108 if(exponent > 254)/*overflow*/ 109 { 110 val.u32 = sign | 0x7f800000; 111 return __amd_handle_errorf("ldexpf", __amd_ldexp, val.u32, _OVERFLOW, AMD_F_INEXACT|AMD_F_OVERFLOW, ERANGE, x, (float)n, 2); 112 } 113 114 val.u32 = sign | (exponent << 23) | (val.u32 & 0x007fffff);/*x is normal and output is normal*/ 115 return val.f32; 116 } 117 118 119