[APInt] Fix extractBits to correctly handle Result.isSingleWord() case.
Summary: extractBits assumes that `!this->isSingleWord() implies !Result.isSingleWord()`, which may not necessarily be true. Handle both cases.
Reviewers: RKSimon
Subscribers: sanjoy, llvm-commits, hiraditya
Differential Revision: https://reviews.llvm.org/D43363
llvm-svn: 325311
diff --git a/llvm/unittests/ADT/APIntTest.cpp b/llvm/unittests/ADT/APIntTest.cpp
index 05fad38..331b399 100644
--- a/llvm/unittests/ADT/APIntTest.cpp
+++ b/llvm/unittests/ADT/APIntTest.cpp
@@ -1768,6 +1768,13 @@
i257.extractBits(128, 1).getSExtValue());
EXPECT_EQ(static_cast<int64_t>(0xFFFFFFFFFF80007Full),
i257.extractBits(129, 1).getSExtValue());
+
+ EXPECT_EQ(APInt(48, 0),
+ APInt(144, "281474976710655", 10).extractBits(48, 48));
+ EXPECT_EQ(APInt(48, 0x0000ffffffffffffull),
+ APInt(144, "281474976710655", 10).extractBits(48, 0));
+ EXPECT_EQ(APInt(48, 0x00007fffffffffffull),
+ APInt(144, "281474976710655", 10).extractBits(48, 1));
}
TEST(APIntTest, getLowBitsSet) {