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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [libgcc/] [config/] [libbid/] [bid64_logb.c] - Rev 402
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/* Copyright (C) 2007, 2009 Free Software Foundation, Inc. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ #include "bid_internal.h" #define MAX_FORMAT_DIGITS 16 #define DECIMAL_EXPONENT_BIAS 398 #if DECIMAL_CALL_BY_REFERENCE void bid64_logb (int * pres, UINT64 * px _EXC_FLAGS_PARAM _EXC_MASKS_PARAM _EXC_INFO_PARAM) { UINT64 x; #else int bid64_logb (UINT64 x _EXC_FLAGS_PARAM _EXC_MASKS_PARAM _EXC_INFO_PARAM) { #endif UINT64 sign_x, coefficient_x; int_double dx; int exponent_x, bin_expon_cx, digits; #if DECIMAL_CALL_BY_REFERENCE x = *px; #endif // unpack arguments, check for NaN or Infinity if (!unpack_BID64 (&sign_x, &exponent_x, &coefficient_x, x)) { // x is Inf. or NaN #ifdef SET_STATUS_FLAGS __set_status_flags (pfpsf, INVALID_EXCEPTION); #endif BID_RETURN (0x80000000); } // find number of digits in coefficient if (coefficient_x >= 1000000000000000ull) { digits = 16; } else { dx.d = (double)coefficient_x; // exact conversion; bin_expon_cx = (int)(dx.i >> 52) - 1023; digits = estimate_decimal_digits[bin_expon_cx]; if (coefficient_x >= power10_table_128[digits].w[0]) digits++; } exponent_x = exponent_x - DECIMAL_EXPONENT_BIAS + digits - 1; BID_RETURN (exponent_x); }
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