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Make ConstantRange::truncate a bit more efficient.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145122 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2011-11-24 17:24:33 +00:00
parent 9d399b1fc2
commit b3ff49e923
1 changed files with 2 additions and 4 deletions
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6
lib/Support/ConstantRange.cpp
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@ -466,10 +466,8 @@ ConstantRange ConstantRange::signExtend(uint32_t DstTySize) const {
/// correspond to the possible range of values as if the source range had been
/// truncated to the specified type.
ConstantRange ConstantRange::truncate(uint32_t DstTySize) const {
unsigned SrcTySize = getBitWidth();
assert(SrcTySize > DstTySize && "Not a value truncation");
APInt Size(APInt::getLowBitsSet(SrcTySize, DstTySize));
if (isFullSet() || getSetSize().ugt(Size))
assert(getBitWidth() > DstTySize && "Not a value truncation");
if (isFullSet() || getSetSize().getActiveBits() > DstTySize)
return ConstantRange(DstTySize, /*isFullSet=*/true);
return ConstantRange(Lower.trunc(DstTySize), Upper.trunc(DstTySize));