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Fix an error in ConstantRange::getSignedMax on wrapped ranges. Thanks once

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again to Daniel Dunbar and KLEE!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75449 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2009-07-13 04:50:21 +00:00
parent ff84de767a
commit 780905e9f9
2 changed files with 7 additions and 7 deletions
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6
lib/Support/ConstantRange.cpp
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@ -159,14 +159,10 @@ APInt ConstantRange::getSignedMax() const {
else
return SignedMax;
} else {
if ((getUpper() - 1).slt(getLower())) {
if (getLower() != SignedMax)
if (getLower().isNegative() == getUpper().isNegative())
return SignedMax;
else
return getUpper() - 1;
} else {
return getUpper() - 1;
}
}
}

4
unittests/Support/ConstantRangeTest.cpp
View File

@ -137,6 +137,10 @@ TEST_F(ConstantRangeTest, GetMinsAndMaxes) {
EXPECT_EQ(One.getSignedMin(), APInt(16, 0xa));
EXPECT_EQ(Some.getSignedMin(), APInt(16, 0xa));
EXPECT_EQ(Wrap.getSignedMin(), APInt(16, INT16_MIN));
// Found by Klee
EXPECT_EQ(ConstantRange(APInt(4, 7), APInt(4, 0)).getSignedMax(),
APInt(4, 7));
}
TEST_F(ConstantRangeTest, Trunc) {