added: '#ifndef __GNUC__' to Big::Pow() where is using '#pragma warning'

in order to not confuse GCC


git-svn-id: svn://ttmath.org/publicrep/ttmath/trunk@109 e52654a7-88a9-db11-a3e9-0013d4bc506e

CHANGELOG

@@ -1,4 +1,4 @@
-Version 0.8.3 prerelease (2009.03.24):
+Version 0.8.3 prerelease:
     * fixed:   RclMoveAllWords() and RcrMoveAllWords() sometimes didn't return
                the proper carry, (when 'bits' was greater than or equal to 'value_size')
                this had impact on Rcl() and Rcr(), they also returned the wrong carry	
@@ -18,6 +18,10 @@ Version 0.8.3 prerelease (2009.03.24):
                Big<2,3> a = 100;
                Big<3,5> b;
                b = a; // b had a wrong value
+    * fixed:   Big::Pow(const Big<exp, man> & pow)
+               it's using PowInt() only when pow.exponent is in range (-man*TTMATH_BITS_PER_UINT; 0]
+               previously the powering 'hung' on an input like this: "(1+ 1e-10000) ^ 10e100000000"
+               (there was 10e100000000 iterations in PowInt())
     * changed: UInt::FromString, added a parametr 'after_source'
                which is pointing at the end of the parsing string
     * changed: renamed: Big::PowUInt(UInt<pow_size> pow) -> Big::Pow(UInt<pow_size> pow)

ttmath/ttmathbig.h

@@ -1642,7 +1642,9 @@ public:
 		// MS Visual Express 2005 reports a warning (in the lines with 'uint man_diff = ...'):
 		// warning C4307: '*' : integral constant overflow
 		// but we're using 'if( man > another_man )' and 'if( man < another_man )' and there'll be no such a situation here
+		#ifndef __GNUC__
 		#pragma warning( disable: 4307 )
+		#endif
 
 		if( man > another_man )
 		{
@@ -1655,9 +1657,10 @@ public:
 			uint man_diff = (another_man - man) * TTMATH_BITS_PER_UINT;
 			c += exponent.AddInt(man_diff, 0);
 		}
-
+		
+		#ifndef __GNUC__
 		#pragma warning( default: 4307 )
-
+		#endif
 
 		// mantissa doesn't have to be standardized (either the highest bit is set or all bits are equal zero)
 		CorrectZero();