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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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lib/Support/ConstantRange.cpp
+6 -2
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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));
}