From 8bf048b53d02ef1051f6021df6525722c5afc9fd Mon Sep 17 00:00:00 2001
From: hellerve <veit@veitheller.de>
Date: Mon, 31 Jul 2017 13:03:18 -0400
Subject: [PATCH] multiplication: fixed rest part

---
 silly.c      | 4 ++--
 tests/test.c | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/silly.c b/silly.c
index ad67ace..a163753 100644
--- a/silly.c
+++ b/silly.c
@@ -63,8 +63,8 @@ silly silly_mul(silly x, silly y) {
 
   z.sign = x.sign ^ y.sign;
 
-  uint64_t t0 = (x.before * y.after);
-  uint64_t t1 = (y.before * x.after);
+  uint64_t t0 = ((uint64_t) x.before) * y.after;
+  uint64_t t1 = ((uint64_t) y.before) * x.after;
   z.before = x.before * y.before + (t0>>32) + (t1>>32);
   uint32_t t0b = t0&0xffffffff;
   uint32_t t1b = t1&0xffffffff;
diff --git a/tests/test.c b/tests/test.c
index 16fab9c..e7cac3e 100644
--- a/tests/test.c
+++ b/tests/test.c
@@ -81,13 +81,13 @@ TEST silly_multiplication() {
 
   x = silly_zeros();
   x.before = 3;
-  x.after = 0xffffffff;
+  x.after = 1<<31;
   y = silly_zeros();
   y.before = 2;
   x = silly_mul(x, y);
 
-  /*ASSERT_EQ_FMT(7, x.before, "%d");
-  ASSERT_EQ_FMT(0, x.after, "%d");*/
+  ASSERT_EQ_FMT(7, x.before, "%d");
+  ASSERT_EQ_FMT(0, x.after, "%d");
 
   PASS();
 }