From 26ef04fa9cd265d8f10cd46dcf2712100af4da88 Mon Sep 17 00:00:00 2001
From: "yangguo@chromium.org"
 <yangguo@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Mon, 8 Apr 2013 15:13:57 +0000
Subject: [PATCH] Fix bug in bignum implementation.

R=mstarzinger@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/13454019

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14167 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/bignum.cc | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/bignum.cc b/src/bignum.cc
index 9436322..c8b61ee 100644
--- a/src/bignum.cc
+++ b/src/bignum.cc
@@ -735,6 +735,13 @@ void Bignum::BigitsShiftLeft(int shift_amount) {
 
 
 void Bignum::SubtractTimes(const Bignum& other, int factor) {
+#ifdef DEBUG
+  Bignum a, b;
+  a.AssignBignum(*this);
+  b.AssignBignum(other);
+  b.MultiplyByUInt32(factor);
+  a.SubtractBignum(b);
+#endif
   ASSERT(exponent_ <= other.exponent_);
   if (factor < 3) {
     for (int i = 0; i < factor; ++i) {
@@ -758,9 +765,9 @@ void Bignum::SubtractTimes(const Bignum& other, int factor) {
     Chunk difference = bigits_[i] - borrow;
     bigits_[i] = difference & kBigitMask;
     borrow = difference >> (kChunkSize - 1);
-    ++i;
   }
   Clamp();
+  ASSERT(Bignum::Equal(a, *this));
 }
 
 
-- 
2.7.4