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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>
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@ -2004,8 +2004,7 @@ static void omap_mpuio_write(void *opaque, hwaddr addr,
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case 0x04: /* OUTPUT_REG */
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diff = (s->outputs ^ value) & ~s->dir;
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s->outputs = value;
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while ((ln = ffs(diff))) {
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ln --;
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while ((ln = ctz32(diff)) != 32) {
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if (s->handler[ln])
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qemu_set_irq(s->handler[ln], (value >> ln) & 1);
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diff &= ~(1 << ln);
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@ -2017,8 +2016,7 @@ static void omap_mpuio_write(void *opaque, hwaddr addr,
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s->dir = value;
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value = s->outputs & ~s->dir;
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while ((ln = ffs(diff))) {
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ln --;
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while ((ln = ctz32(diff)) != 32) {
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if (s->handler[ln])
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qemu_set_irq(s->handler[ln], (value >> ln) & 1);
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diff &= ~(1 << ln);
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@ -814,12 +814,12 @@ static uint32_t find_free_port_id(VirtIOSerial *vser)
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max_nr_ports = vser->serial.max_virtserial_ports;
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for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
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uint32_t map, bit;
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uint32_t map, zeroes;
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map = vser->ports_map[i];
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bit = ffs(~map);
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if (bit) {
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return (bit - 1) + i * 32;
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zeroes = ctz32(~map);
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if (zeroes != 32) {
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return zeroes + i * 32;
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}
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}
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return VIRTIO_CONSOLE_BAD_ID;
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@ -125,8 +125,7 @@ static void omap_gpio_write(void *opaque, hwaddr addr,
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case 0x04: /* DATA_OUTPUT */
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diff = (s->outputs ^ value) & ~s->dir;
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s->outputs = value;
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while ((ln = ffs(diff))) {
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ln --;
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while ((ln = ctz32(diff)) != 32) {
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if (s->handler[ln])
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qemu_set_irq(s->handler[ln], (value >> ln) & 1);
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diff &= ~(1 << ln);
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@ -138,8 +137,7 @@ static void omap_gpio_write(void *opaque, hwaddr addr,
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s->dir = value;
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value = s->outputs & ~s->dir;
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while ((ln = ffs(diff))) {
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ln --;
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while ((ln = ctz32(diff)) != 32) {
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if (s->handler[ln])
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qemu_set_irq(s->handler[ln], (value >> ln) & 1);
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diff &= ~(1 << ln);
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@ -253,8 +251,7 @@ static inline void omap2_gpio_module_out_update(struct omap2_gpio_s *s,
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s->outputs ^= diff;
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diff &= ~s->dir;
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while ((ln = ffs(diff))) {
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ln --;
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while ((ln = ctz32(diff)) != 32) {
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qemu_set_irq(s->handler[ln], (s->outputs >> ln) & 1);
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diff &= ~(1 << ln);
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}
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@ -442,8 +439,8 @@ static void omap2_gpio_module_write(void *opaque, hwaddr addr,
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s->dir = value;
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value = s->outputs & ~s->dir;
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while ((ln = ffs(diff))) {
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diff &= ~(1 <<-- ln);
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while ((ln = ctz32(diff)) != 32) {
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diff &= ~(1 << ln);
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qemu_set_irq(s->handler[ln], (value >> ln) & 1);
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}
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@ -171,9 +171,13 @@ static uint32_t omap_i2c_read(void *opaque, hwaddr addr)
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case 0x0c: /* I2C_IV */
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if (s->revision >= OMAP2_INTR_REV)
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break;
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ret = ffs(s->stat & s->mask);
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if (ret)
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s->stat ^= 1 << (ret - 1);
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ret = ctz32(s->stat & s->mask);
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if (ret != 32) {
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s->stat ^= 1 << ret;
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ret++;
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} else {
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ret = 0;
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}
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omap_i2c_interrupts_update(s);
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return ret;
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@ -23,7 +23,7 @@
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static void aw_a10_pic_update(AwA10PICState *s)
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{
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uint8_t i;
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int irq = 0, fiq = 0, pending;
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int irq = 0, fiq = 0, zeroes;
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s->vector = 0;
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@ -32,9 +32,9 @@ static void aw_a10_pic_update(AwA10PICState *s)
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fiq |= s->select[i] & s->irq_pending[i] & ~s->mask[i];
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if (!s->vector) {
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pending = ffs(s->irq_pending[i] & ~s->mask[i]);
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if (pending) {
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s->vector = (i * 32 + pending - 1) * 4;
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zeroes = ctz32(s->irq_pending[i] & ~s->mask[i]);
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if (zeroes != 32) {
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s->vector = (i * 32 + zeroes) * 4;
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}
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}
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}
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@ -1141,18 +1141,18 @@ static int kvm_irqchip_get_virq(KVMState *s)
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{
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uint32_t *word = s->used_gsi_bitmap;
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int max_words = ALIGN(s->gsi_count, 32) / 32;
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int i, bit;
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int i, zeroes;
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bool retry = true;
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again:
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/* Return the lowest unused GSI in the bitmap */
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for (i = 0; i < max_words; i++) {
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bit = ffs(~word[i]);
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if (!bit) {
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zeroes = ctz32(~word[i]);
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if (zeroes == 32) {
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continue;
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}
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return bit - 1 + i * 32;
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return zeroes + i * 32;
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}
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if (!s->direct_msi && retry) {
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retry = false;
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