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base: Fix CircularQueue's operator-= when negative subtraction

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Using operator-= when the rhs is a negative value is equivalent
to using += on -rhs. This is fixing rounding in that scenario.

Change-Id: Ia22e51f81a6805d27fd6b2115d288bb23421d00f
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/17528
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
This commit is contained in:
Giacomo Travaglini
2019-03-21 15:41:04 +00:00
parent bbcbde7a92
commit d94e5b5d91
2 changed files with 8 additions and 5 deletions
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10
src/base/circular_queue.hh
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@@ -323,12 +323,12 @@ class CircularQueue : private std::vector<T>
assert(_cq);
/* C does not do euclidean division, so we have to adjust */
if (t >= 0)
if (t >= 0) {
_round += (-t + _idx) / _cq->capacity();
else
_round += (-t + _idx - _cq->capacity() + 1) / _cq->capacity();
_idx = _cq->moduloSub(_idx, t);
_idx = _cq->moduloSub(_idx, t);
} else {
*this += -t;
}
return *this;
}