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Add a new isSignWrappedSet() method to ConstantRange.

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Fix zeroExtend and signExtend to support empty sets, and to return the smallest
possible result set which contains the extension of each element in their
inputs. For example zext i8 [100, 10) to i16 is now [0, 256), not i16 [100, 10)
which contains 63446 members.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113187 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2010-09-06 23:52:49 +00:00
parent c5cebeb3cb
commit 32cda119ef
3 changed files with 42 additions and 7 deletions
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26
unittests/Support/ConstantRangeTest.cpp
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@ -146,6 +146,22 @@ TEST_F(ConstantRangeTest, GetMinsAndMaxes) {
APInt(4, 7));
}
TEST_F(ConstantRangeTest, SignWrapped) {
EXPECT_TRUE(Full.isSignWrappedSet());
EXPECT_FALSE(Empty.isSignWrappedSet());
EXPECT_FALSE(One.isSignWrappedSet());
EXPECT_FALSE(Some.isSignWrappedSet());
EXPECT_TRUE(Wrap.isSignWrappedSet());
EXPECT_FALSE(ConstantRange(APInt(8, 127), APInt(8, 128)).isSignWrappedSet());
EXPECT_TRUE(ConstantRange(APInt(8, 127), APInt(8, 129)).isSignWrappedSet());
EXPECT_FALSE(ConstantRange(APInt(8, 128), APInt(8, 129)).isSignWrappedSet());
EXPECT_TRUE(ConstantRange(APInt(8, 10), APInt(8, 9)).isSignWrappedSet());
EXPECT_TRUE(ConstantRange(APInt(8, 10), APInt(8, 250)).isSignWrappedSet());
EXPECT_FALSE(ConstantRange(APInt(8, 250), APInt(8, 10)).isSignWrappedSet());
EXPECT_FALSE(ConstantRange(APInt(8, 250), APInt(8, 251)).isSignWrappedSet());
}
TEST_F(ConstantRangeTest, Trunc) {
ConstantRange TFull = Full.truncate(10);
ConstantRange TEmpty = Empty.truncate(10);
@ -171,8 +187,7 @@ TEST_F(ConstantRangeTest, ZExt) {
APInt(One.getUpper()).zext(20)));
EXPECT_EQ(ZSome, ConstantRange(APInt(Some.getLower()).zext(20),
APInt(Some.getUpper()).zext(20)));
EXPECT_EQ(ZWrap, ConstantRange(APInt(Wrap.getLower()).zext(20),
APInt(Wrap.getUpper()).zext(20)));
EXPECT_EQ(ZWrap, ConstantRange(APInt(20, 0), APInt(20, 0x10000)));
}
TEST_F(ConstantRangeTest, SExt) {
@ -188,8 +203,11 @@ TEST_F(ConstantRangeTest, SExt) {
APInt(One.getUpper()).sext(20)));
EXPECT_EQ(SSome, ConstantRange(APInt(Some.getLower()).sext(20),
APInt(Some.getUpper()).sext(20)));
EXPECT_EQ(SWrap, ConstantRange(APInt(Wrap.getLower()).sext(20),
APInt(Wrap.getUpper()).sext(20)));
EXPECT_EQ(SWrap, ConstantRange(APInt(20, (uint64_t)INT16_MIN, true),
APInt(20, INT16_MAX + 1, true)));
EXPECT_EQ(ConstantRange(APInt(8, 120), APInt(8, 140)).signExtend(16),
ConstantRange(APInt(16, -128), APInt(16, 128)));
}
TEST_F(ConstantRangeTest, IntersectWith) {