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omap_intc: convert ffs(3) to ctz32() in omap_inth_sir_update()

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Rewrite the loop using level &= level - 1 to clear the least significant
bit after each iteration.  This simplifies the loop and makes it easy to
replace ffs(3) with ctz32().

Cc: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1427124571-28598-8-git-send-email-stefanha@redhat.com
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-03-23 15:29:29 +00:00 committed by Kevin Wolf
parent c9d9331851
commit 41074f3d3f
1 changed files with 5 additions and 4 deletions
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9
hw/intc/omap_intc.c
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@ -60,7 +60,7 @@ struct omap_intr_handler_s {
static void omap_inth_sir_update(struct omap_intr_handler_s *s, int is_fiq)
{
int i, j, sir_intr, p_intr, p, f;
int i, j, sir_intr, p_intr, p;
uint32_t level;
sir_intr = 0;
p_intr = 255;
@ -72,14 +72,15 @@ static void omap_inth_sir_update(struct omap_intr_handler_s *s, int is_fiq)
for (j = 0; j < s->nbanks; ++j) {
level = s->bank[j].irqs & ~s->bank[j].mask &
(is_fiq ? s->bank[j].fiq : ~s->bank[j].fiq);
for (f = ffs(level), i = f - 1, level >>= f - 1; f; i += f,
level >>= f) {
while (level != 0) {
i = ctz32(level);
p = s->bank[j].priority[i];
if (p <= p_intr) {
p_intr = p;
sir_intr = 32 * j + i;
}
f = ffs(level >> 1);
level &= level - 1;
}
}
s->sir_intr[is_fiq] = sir_intr;