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Add a FIXME

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34828 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-03-02 02:01:34 +00:00
parent 4474d87fd3
commit 9bf94a4a9f
1 changed files with 3 additions and 0 deletions
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lib/Support/APInt.cpp
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@ -1239,6 +1239,9 @@ APInt APInt::sqrt() const {
}
// Make sure we return the closest approximation
// FIXME: This still has an off-by-one error in it. Test case:
// 190 bits: sqrt(694114394047834196220892040454508646882614255319893124270) =
// 26346050824513229049493703285 (not 26346050824513229049493703284)
APInt square(x_old * x_old);
APInt nextSquare((x_old + 1) * (x_old +1));
if (this->ult(square))