1 files changed, 73 insertions, 0 deletions
diff --git a/gcc-4.3.1/libgcc/config/libbid/bid64_logb.c b/gcc-4.3.1/libgcc/config/libbid/bid64_logb.c
new file mode 100644
index 000000000..b0f1fd15c
--- /dev/null
+++ b/gcc-4.3.1/libgcc/config/libbid/bid64_logb.c
@@ -0,0 +1,73 @@
+/* Copyright (C) 2007  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 2, or (at your option) any later
+version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file.  (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+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.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING.  If not, write to the Free
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA.  */
+
+#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);
+}