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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2015-03-23 15:29:27 +0000 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2015-04-28 15:36:08 +0200 |
| commit | bd2a88840e2496e29442f333c8fdd6491e831a35 (patch) | |
| tree | 95ced0dfbbd8ac39d8e73b55a414398dccb106ad /hw/gpio | |
| parent | 786a4ea82ec9c87e3a895cf41081029b285a5fe5 (diff) | |
| download | qemu-bd2a88840e2496e29442f333c8fdd6491e831a35.zip qemu-bd2a88840e2496e29442f333c8fdd6491e831a35.tar.gz qemu-bd2a88840e2496e29442f333c8fdd6491e831a35.tar.bz2 | |
Convert ffs() != 0 callers to ctz32()
There are a number of ffs(3) callers that do roughly:
bit = ffs(val);
if (bit) {
do_something(bit - 1);
}
This pattern can be converted to ctz32() like this:
zeroes = ctz32(val);
if (zeroes != 32) {
do_something(zeroes);
}
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1427124571-28598-6-git-send-email-stefanha@redhat.com
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'hw/gpio')
| -rw-r--r-- | hw/gpio/omap_gpio.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/hw/gpio/omap_gpio.c b/hw/gpio/omap_gpio.c index 9a43486..d92f8cf 100644 --- a/hw/gpio/omap_gpio.c +++ b/hw/gpio/omap_gpio.c @@ -125,8 +125,7 @@ static void omap_gpio_write(void *opaque, hwaddr addr, case 0x04: /* DATA_OUTPUT */ diff = (s->outputs ^ value) & ~s->dir; s->outputs = value; - while ((ln = ffs(diff))) { - ln --; + while ((ln = ctz32(diff)) != 32) { if (s->handler[ln]) qemu_set_irq(s->handler[ln], (value >> ln) & 1); diff &= ~(1 << ln); @@ -138,8 +137,7 @@ static void omap_gpio_write(void *opaque, hwaddr addr, s->dir = value; value = s->outputs & ~s->dir; - while ((ln = ffs(diff))) { - ln --; + while ((ln = ctz32(diff)) != 32) { if (s->handler[ln]) qemu_set_irq(s->handler[ln], (value >> ln) & 1); diff &= ~(1 << ln); @@ -253,8 +251,7 @@ static inline void omap2_gpio_module_out_update(struct omap2_gpio_s *s, s->outputs ^= diff; diff &= ~s->dir; - while ((ln = ffs(diff))) { - ln --; + while ((ln = ctz32(diff)) != 32) { qemu_set_irq(s->handler[ln], (s->outputs >> ln) & 1); diff &= ~(1 << ln); } @@ -442,8 +439,8 @@ static void omap2_gpio_module_write(void *opaque, hwaddr addr, s->dir = value; value = s->outputs & ~s->dir; - while ((ln = ffs(diff))) { - diff &= ~(1 <<-- ln); + while ((ln = ctz32(diff)) != 32) { + diff &= ~(1 << ln); qemu_set_irq(s->handler[ln], (value >> ln) & 1); } |