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make ConstantRange::zeroExtend() optimal

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160643 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nuno Lopes 2012-07-23 20:33:29 +00:00
parent 5e31044e11
commit b42729b53a
2 changed files with 10 additions and 2 deletions
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8
lib/Support/ConstantRange.cpp
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@ -427,9 +427,13 @@ ConstantRange ConstantRange::zeroExtend(uint32_t DstTySize) const {
unsigned SrcTySize = getBitWidth();
assert(SrcTySize < DstTySize && "Not a value extension");
if (isFullSet() || isWrappedSet())
if (isFullSet() || isWrappedSet()) {
// Change into [0, 1 << src bit width)
return ConstantRange(APInt(DstTySize,0), APInt(DstTySize,1).shl(SrcTySize));
APInt LowerExt(DstTySize, 0);
if (!Upper) // special case: [X, 0) -- not really wrapping around
LowerExt = Lower.zext(DstTySize);
return ConstantRange(LowerExt, APInt(DstTySize, 1).shl(SrcTySize));
}
return ConstantRange(Lower.zext(DstTySize), Upper.zext(DstTySize));
}

4
unittests/Support/ConstantRangeTest.cpp
View File

@ -193,6 +193,10 @@ TEST_F(ConstantRangeTest, ZExt) {
EXPECT_EQ(ZSome, ConstantRange(Some.getLower().zext(20),
Some.getUpper().zext(20)));
EXPECT_EQ(ZWrap, ConstantRange(APInt(20, 0), APInt(20, 0x10000)));
// zext([5, 0), 3->7) = [5, 8)
ConstantRange FiveZero(APInt(3, 5), APInt(3, 0));
EXPECT_EQ(FiveZero.zeroExtend(7), ConstantRange(APInt(7, 5), APInt(7, 8)));
}
TEST_F(ConstantRangeTest, SExt) {