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ra: assert against unsigned underflow in q_total

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q_total should never go below 0 (which is why it's defined as unsigned),
and if it does, then something is seriously wrong.

Signed-off-by: Connor Abbott <cwabbott0@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Connor Abbott 2014-09-05 20:59:32 -04:00 • committed by Andreas Boll
parent ec046bc08e
commit 2828680e39
1 changed files with 1 additions and 0 deletions
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src/mesa/program/register_allocate.c
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@ -434,6 +434,7 @@ decrement_q(struct ra_graph *g, unsigned int n)
unsigned int n2_class = g->nodes[n2].class;
if (n != n2 && !g->nodes[n2].in_stack) {
assert(g->nodes[n2].q_total >= g->regs->classes[n2_class]->q[n_class]);
g->nodes[n2].q_total -= g->regs->classes[n2_class]->q[n_class];
}
}