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Fixed a bug in the integer division code that caused some large numerators to be incorrectly handled

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This commit is contained in:
Benoit Steiner
2015-07-13 11:14:59 -07:00
parent ea87561564
commit 3912ca0d53
2 changed files with 44 additions and 8 deletions
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7
unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h
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@@ -62,8 +62,11 @@ struct TensorIntDivisor {
// fast ln2
const int leading_zeros = count_leading_zeros(divider);
const int log_div = N - (leading_zeros+1);
int log_div = N - leading_zeros;
// If divider is a power of two then log_div is 1 more than it should be.
if ((1ull << (log_div-1)) == divider) {
log_div--;
}
multiplier = (static_cast<uint64_t>(1) << (N+log_div)) / divider - (static_cast<uint64_t>(1) << N) + 1;
shift1 = log_div > 1 ? 1 : log_div;
shift2 = log_div > 1 ? log_div-1 : 0;