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Merge from mainline.

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llvm-svn: 37076
This commit is contained in:
Tanya Lattner
2007-05-15 05:00:54 +00:00
parent 05c9c7203d
commit d1e8ff86b5
1 changed files with 6 additions and 0 deletions
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6
llvm/lib/Support/APInt.cpp
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@@ -1199,6 +1199,12 @@ APInt APInt::shl(uint32_t shiftAmt) const {
if (shiftAmt == BitWidth) if (shiftAmt == BitWidth)
return APInt(BitWidth, 0); return APInt(BitWidth, 0);
// If none of the bits are shifted out, the result is *this. This avoids a
// lshr by the words size in the loop below which can produce incorrect
// results. It also avoids the expensive computation below for a common case.
if (shiftAmt == 0)
return *this;
// Create some space for the result. // Create some space for the result.
uint64_t * val = new uint64_t[getNumWords()]; uint64_t * val = new uint64_t[getNumWords()];