From c51b2fdcc96ae04a20708dab80ccc93e81b6b0cc Mon Sep 17 00:00:00 2001
From: Tomasz Sowa <t.sowa@ttmath.org>
Date: Thu, 14 Oct 2010 23:21:16 +0000
Subject: [PATCH] changed: small improvements in UInt::Pow() and Big::Pow()

git-svn-id: svn://ttmath.org/publicrep/ttmath/trunk@325 e52654a7-88a9-db11-a3e9-0013d4bc506e
---
 ttmath/ttmathbig.h  | 15 +++++----------
 ttmath/ttmathuint.h |  6 ++----
 2 files changed, 7 insertions(+), 14 deletions(-)

diff --git a/ttmath/ttmathbig.h b/ttmath/ttmathbig.h
index 6be5d9b..dc6447e 100644
--- a/ttmath/ttmathbig.h
+++ b/ttmath/ttmathbig.h
@@ -1571,7 +1571,7 @@ public:
 			return 0;
 		}
 
-		Big<exp, man> start(*this), start_temp;
+		Big<exp, man> start(*this);
 		Big<exp, man> result;
 		result.SetOne();
 		uint c = 0;
@@ -1586,8 +1586,7 @@ public:
 			if( pow.IsZero() )
 				break;
 
-			start_temp = start;
-			c += start.Mul(start_temp);
+			c += start.Mul(start);
 		}
 
 		*this = result;
@@ -1665,13 +1664,10 @@ public:
 		if( pow.IsSign() )
 			pow.Abs();
 
-		Big<exp, man> start(*this), start_temp;
+		Big<exp, man> start(*this);
 		Big<exp, man> result;
 		Big<exp, man> one;
-		Int<exp> e_one;
 		uint c = 0;
-
-		e_one.SetOne();
 		one.SetOne();
 		result = one;
 
@@ -1680,13 +1676,12 @@ public:
 			if( pow.Mod2() )
 				c += result.Mul(start);
 
-			c += pow.exponent.Sub( e_one ); // !! may use SubOne() here?
+			c += pow.exponent.SubOne();
 
 			if( pow < one )
 				break;
 
-			start_temp = start;
-			c += start.Mul(start_temp);
+			c += start.Mul(start);
 		}
 
 		*this = result;
diff --git a/ttmath/ttmathuint.h b/ttmath/ttmathuint.h
index 25ffbb8..8f26626 100644
--- a/ttmath/ttmathuint.h
+++ b/ttmath/ttmathuint.h
@@ -2370,7 +2370,7 @@ public:
 			// we don't define zero^zero
 			return 2;
 
-		UInt<value_size> start(*this), start_temp;
+		UInt<value_size> start(*this);
 		UInt<value_size> result;
 		result.SetOne();
 		uint c = 0;
@@ -2384,9 +2384,7 @@ public:
 			if( pow.IsZero() )
 				break;
 
-			start_temp = start;
-			// in the second Mul algorithm we can use start.Mul(start) directly (there is no TTMATH_ASSERT_REFERENCE there)
-			c += start.Mul(start_temp);
+			c += start.Mul(start);
 		}
 
 		*this = result;