Add a unittest for rotating a really big APInt.

Clang miscompiles it under certain circumstances, and it's a good exercise for APInt. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149986 91177308-0d34-0410-b5e6-96231b3b80d8
dlespiau · Feb 7, 2012 · 0ae29a6 · 0ae29a6
1 parent b0b527b
commit 0ae29a6
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/unittests/ADT/APIntTest.cpp b/unittests/ADT/APIntTest.cpp
@@ -480,6 +480,10 @@ TEST(APIntTest, Rotate) {
   EXPECT_EQ(APInt(8, 64),  APInt(8, 1).rotr(2));
   EXPECT_EQ(APInt(8, 16),  APInt(8, 1).rotr(4));
   EXPECT_EQ(APInt(8, 1),   APInt(8, 1).rotr(8));
+
+  APInt Big(256, "00004000800000000000000000003fff8000000000000000", 16);
+  APInt Rot(256, "3fff80000000000000000000000000000000000040008000", 16);
+  EXPECT_EQ(Rot, Big.rotr(144));
 }
 
 }