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'i8 full-range' sign extended to i16 should equal [-128, 128) not [-128, 127).

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Found by Daniel Dunbar and KLEE.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75448 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2009-07-13 04:17:23 +00:00
parent 0a5372ed3e
commit ff84de767a
2 changed files with 2 additions and 2 deletions
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2
lib/Support/ConstantRange.cpp
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@ -505,7 +505,7 @@ ConstantRange ConstantRange::signExtend(uint32_t DstTySize) const {
assert(SrcTySize < DstTySize && "Not a value extension");
if (isFullSet()) {
return ConstantRange(APInt::getHighBitsSet(DstTySize,DstTySize-SrcTySize+1),
APInt::getLowBitsSet(DstTySize, SrcTySize-1));
APInt::getLowBitsSet(DstTySize, SrcTySize-1) + 1);
}
APInt L = Lower; L.sext(DstTySize);

2
unittests/Support/ConstantRangeTest.cpp
View File

@ -175,7 +175,7 @@ TEST_F(ConstantRangeTest, SExt) {
ConstantRange SSome = Some.signExtend(20);
ConstantRange SWrap = Wrap.signExtend(20);
EXPECT_EQ(SFull, ConstantRange(APInt(20, INT16_MIN, true),
APInt(20, INT16_MAX, true)));
APInt(20, INT16_MAX + 1, true)));
EXPECT_TRUE(SEmpty.isEmptySet());
EXPECT_EQ(SOne, ConstantRange(APInt(One.getLower()).sext(20),
APInt(One.getUpper()).sext(20)));