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Convert (ffs(val) - 1) to ctz32(val)

Browse source 
This commit was generated mechanically by coccinelle from the following
semantic patch:

@@
expression val;
@@
- (ffs(val) - 1)
+ ctz32(val)

The call sites have been audited to ensure the ffs(0) - 1 == -1 case
never occurs (due to input validation, asserts, etc).  Therefore we
don't need to worry about the fact that ctz32(0) == 32.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1427124571-28598-5-git-send-email-stefanha@redhat.com
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2015-03-23 15:29:26 +00:00 committed by Kevin Wolf
parent 5863d374a3
commit 786a4ea82e
22 changed files with 50 additions and 50 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
block.c
View file

@ -5452,7 +5452,7 @@ BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity,
return NULL;
}
bitmap = g_new0(BdrvDirtyBitmap, 1);
bitmap->bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1);
bitmap->bitmap = hbitmap_alloc(bitmap_size, ctz32(granularity));
QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list);
return bitmap;
}

2
block/qcow2-refcount.c
View file

@ -2450,7 +2450,7 @@ int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset,
if (ret < 0) {
return ret;
} else if (ret > 0) {
int metadata_ol_bitnr = ffs(ret) - 1;
int metadata_ol_bitnr = ctz32(ret);
assert(metadata_ol_bitnr < QCOW2_OL_MAX_BITNR);
qcow2_signal_corruption(bs, true, offset, size, "Preventing invalid "

4
block/qcow2.c
View file

@ -1802,7 +1802,7 @@ static int qcow2_create2(const char *filename, int64_t total_size,
{
/* Calculate cluster_bits */
int cluster_bits;
cluster_bits = ffs(cluster_size) - 1;
cluster_bits = ctz32(cluster_size);
if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS ||
(1 << cluster_bits) != cluster_size)
{
@ -2110,7 +2110,7 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
goto finish;
}
refcount_order = ffs(refcount_bits) - 1;
refcount_order = ctz32(refcount_bits);
ret = qcow2_create2(filename, size, backing_file, backing_fmt, flags,
cluster_size, prealloc, opts, version, refcount_order,

4
block/qed.c
View file

@ -436,9 +436,9 @@ static int bdrv_qed_open(BlockDriverState *bs, QDict *options, int flags,
s->table_nelems = (s->header.cluster_size * s->header.table_size) /
sizeof(uint64_t);
s->l2_shift = ffs(s->header.cluster_size) - 1;
s->l2_shift = ctz32(s->header.cluster_size);
s->l2_mask = s->table_nelems - 1;
s->l1_shift = s->l2_shift + ffs(s->table_nelems) - 1;
s->l1_shift = s->l2_shift + ctz32(s->table_nelems);
/* Header size calculation must not overflow uint32_t */
if (s->header.header_size > UINT32_MAX / s->header.cluster_size) {

2
block/rbd.c
View file

@ -325,7 +325,7 @@ static int qemu_rbd_create(const char *filename, QemuOpts *opts, Error **errp)
error_setg(errp, "obj size too small");
return -EINVAL;
}
obj_order = ffs(objsize) - 1;
obj_order = ctz32(objsize);
}
clientname = qemu_rbd_parse_clientname(conf, clientname_buf);

2
block/sheepdog.c
View file

@ -1716,7 +1716,7 @@ static int parse_block_size_shift(BDRVSheepdogState *s, QemuOpts *opt)
if ((object_size - 1) & object_size) { /* not a power of 2? */
return -EINVAL;
}
obj_order = ffs(object_size) - 1;
obj_order = ctz32(object_size);
if (obj_order < 20 || obj_order > 31) {
return -EINVAL;
}

2
hw/acpi/pcihp.c
View file

@ -120,7 +120,7 @@ static bool acpi_pcihp_pc_no_hotplug(AcpiPciHpState *s, PCIDevice *dev)
static void acpi_pcihp_eject_slot(AcpiPciHpState *s, unsigned bsel, unsigned slots)
{
BusChild *kid, *next;
int slot = ffs(slots) - 1;
int slot = ctz32(slots);
PCIBus *bus = acpi_pcihp_find_hotplug_bus(s, bsel);
if (!bus) {

2
hw/arm/pxa2xx_gpio.c
View file

@ -137,7 +137,7 @@ static void pxa2xx_gpio_handler_update(PXA2xxGPIOInfo *s) {
level = s->olevel[i] & s->dir[i];
for (diff = s->prev_level[i] ^ level; diff; diff ^= 1 << bit) {
bit = ffs(diff) - 1;
bit = ctz32(diff);
line = bit + 32 * i;
qemu_set_irq(s->handler[line], (level >> bit) & 1);
}

4
hw/arm/strongarm.c
View file

@ -528,7 +528,7 @@ static void strongarm_gpio_handler_update(StrongARMGPIOInfo *s)
level = s->olevel & s->dir;
for (diff = s->prev_level ^ level; diff; diff ^= 1 << bit) {
bit = ffs(diff) - 1;
bit = ctz32(diff);
qemu_set_irq(s->handler[bit], (level >> bit) & 1);
}
@ -745,7 +745,7 @@ static void strongarm_ppc_handler_update(StrongARMPPCInfo *s)
level = s->olevel & s->dir;
for (diff = s->prev_level ^ level; diff; diff ^= 1 << bit) {
bit = ffs(diff) - 1;
bit = ctz32(diff);
qemu_set_irq(s->handler[bit], (level >> bit) & 1);
}

2
hw/display/tc6393xb.c
View file

@ -171,7 +171,7 @@ static void tc6393xb_gpio_handler_update(TC6393xbState *s)
level = s->gpio_level & s->gpio_dir;
for (diff = s->prev_level ^ level; diff; diff ^= 1 << bit) {
bit = ffs(diff) - 1;
bit = ctz32(diff);
qemu_set_irq(s->handler[bit], (level >> bit) & 1);
}

2
hw/gpio/max7310.c
View file

@ -96,7 +96,7 @@ static int max7310_tx(I2CSlave *i2c, uint8_t data)
case 0x01: /* Output port */
for (diff = (data ^ s->level) & ~s->direction; diff;
diff &= ~(1 << line)) {
line = ffs(diff) - 1;
line = ctz32(diff);
if (s->handler[line])
qemu_set_irq(s->handler[line], (data >> line) & 1);
}

2
hw/gpio/zaurus.c
View file

@ -65,7 +65,7 @@ static inline void scoop_gpio_handler_update(ScoopInfo *s) {
level = s->gpio_level & s->gpio_dir;
for (diff = s->prev_level ^ level; diff; diff ^= 1 << bit) {
bit = ffs(diff) - 1;
bit = ctz32(diff);
qemu_set_irq(s->handler[bit], (level >> bit) & 1);
}

2
hw/pci-host/bonito.c
View file

@ -427,7 +427,7 @@ static uint32_t bonito_sbridge_pciaddr(void *opaque, hwaddr addr)
cfgaddr |= (s->regs[BONITO_PCIMAP_CFG] & 0xffff) << 16;
idsel = (cfgaddr & BONITO_PCICONF_IDSEL_MASK) >> BONITO_PCICONF_IDSEL_OFFSET;
devno = ffs(idsel) - 1;
devno = ctz32(idsel);
funno = (cfgaddr & BONITO_PCICONF_FUN_MASK) >> BONITO_PCICONF_FUN_OFFSET;
regno = (cfgaddr & BONITO_PCICONF_REG_MASK) >> BONITO_PCICONF_REG_OFFSET;

12
hw/pci/msi.c
View file

@ -72,7 +72,7 @@ static inline uint8_t msi_cap_sizeof(uint16_t flags)
static inline unsigned int msi_nr_vectors(uint16_t flags)
{
return 1U <<
((flags & PCI_MSI_FLAGS_QSIZE) >> (ffs(PCI_MSI_FLAGS_QSIZE) - 1));
((flags & PCI_MSI_FLAGS_QSIZE) >> ctz32(PCI_MSI_FLAGS_QSIZE));
}
static inline uint8_t msi_flags_off(const PCIDevice* dev)
@ -175,9 +175,9 @@ int msi_init(struct PCIDevice *dev, uint8_t offset,
assert(nr_vectors > 0);
assert(nr_vectors <= PCI_MSI_VECTORS_MAX);
/* the nr of MSI vectors is up to 32 */
vectors_order = ffs(nr_vectors) - 1;
vectors_order = ctz32(nr_vectors);
flags = vectors_order << (ffs(PCI_MSI_FLAGS_QMASK) - 1);
flags = vectors_order << ctz32(PCI_MSI_FLAGS_QMASK);
if (msi64bit) {
flags |= PCI_MSI_FLAGS_64BIT;
}
@ -355,12 +355,12 @@ void msi_write_config(PCIDevice *dev, uint32_t addr, uint32_t val, int len)
* just don't crash the host
*/
log_num_vecs =
(flags & PCI_MSI_FLAGS_QSIZE) >> (ffs(PCI_MSI_FLAGS_QSIZE) - 1);
(flags & PCI_MSI_FLAGS_QSIZE) >> ctz32(PCI_MSI_FLAGS_QSIZE);
log_max_vecs =
(flags & PCI_MSI_FLAGS_QMASK) >> (ffs(PCI_MSI_FLAGS_QMASK) - 1);
(flags & PCI_MSI_FLAGS_QMASK) >> ctz32(PCI_MSI_FLAGS_QMASK);
if (log_num_vecs > log_max_vecs) {
flags &= ~PCI_MSI_FLAGS_QSIZE;
flags |= log_max_vecs << (ffs(PCI_MSI_FLAGS_QSIZE) - 1);
flags |= log_max_vecs << ctz32(PCI_MSI_FLAGS_QSIZE);
pci_set_word(dev->config + msi_flags_off(dev), flags);
}

2
hw/pci/pcie_aer.c
View file

@ -410,7 +410,7 @@ static void pcie_aer_msg(PCIDevice *dev, const PCIEAERMsg *msg)
static void pcie_aer_update_log(PCIDevice *dev, const PCIEAERErr *err)
{
uint8_t *aer_cap = dev->config + dev->exp.aer_cap;
uint8_t first_bit = ffs(err->status) - 1;
uint8_t first_bit = ctz32(err->status);
uint32_t errcap = pci_get_long(aer_cap + PCI_ERR_CAP);
int i;

10
hw/pci/shpc.c
View file

@ -61,7 +61,7 @@
/* Same slot state masks are used for command and status registers */
#define SHPC_SLOT_STATE_MASK 0x03
#define SHPC_SLOT_STATE_SHIFT \
(ffs(SHPC_SLOT_STATE_MASK) - 1)
ctz32(SHPC_SLOT_STATE_MASK)
#define SHPC_STATE_NO 0x0
#define SHPC_STATE_PWRONLY 0x1
@ -70,10 +70,10 @@
#define SHPC_SLOT_PWR_LED_MASK 0xC
#define SHPC_SLOT_PWR_LED_SHIFT \
(ffs(SHPC_SLOT_PWR_LED_MASK) - 1)
ctz32(SHPC_SLOT_PWR_LED_MASK)
#define SHPC_SLOT_ATTN_LED_MASK 0x30
#define SHPC_SLOT_ATTN_LED_SHIFT \
(ffs(SHPC_SLOT_ATTN_LED_MASK) - 1)
ctz32(SHPC_SLOT_ATTN_LED_MASK)
#define SHPC_LED_NO 0x0
#define SHPC_LED_ON 0x1
@ -136,7 +136,7 @@ static int roundup_pow_of_two(int x)
static uint16_t shpc_get_status(SHPCDevice *shpc, int slot, uint16_t msk)
{
uint8_t *status = shpc->config + SHPC_SLOT_STATUS(slot);
return (pci_get_word(status) & msk) >> (ffs(msk) - 1);
return (pci_get_word(status) & msk) >> ctz32(msk);
}
static void shpc_set_status(SHPCDevice *shpc,
@ -144,7 +144,7 @@ static void shpc_set_status(SHPCDevice *shpc,
{
uint8_t *status = shpc->config + SHPC_SLOT_STATUS(slot);
pci_word_test_and_clear_mask(status, msk);
pci_word_test_and_set_mask(status, value << (ffs(msk) - 1));
pci_word_test_and_set_mask(status, value << ctz32(msk));
}
static void shpc_interrupt_update(PCIDevice *d)

2
hw/pci/slotid_cap.c
View file

@ -3,7 +3,7 @@
#include "qemu/error-report.h"
#define SLOTID_CAP_LENGTH 4
#define SLOTID_NSLOTS_SHIFT (ffs(PCI_SID_ESR_NSLOTS) - 1)
#define SLOTID_NSLOTS_SHIFT ctz32(PCI_SID_ESR_NSLOTS)
int slotid_cap_init(PCIDevice *d, int nslots,
uint8_t chassis,

2
hw/ppc/ppce500_spin.c
View file

@ -74,7 +74,7 @@ static void spin_reset(void *opaque)
/* Create -kernel TLB entries for BookE, linearly spanning 256MB. */
static inline hwaddr booke206_page_size_to_tlb(uint64_t size)
{
return (ffs(size >> 10) - 1) >> 1;
return ctz32(size >> 10) >> 1;
}
static void mmubooke_create_initial_mapping(CPUPPCState *env,

2
hw/scsi/megasas.c
View file

@ -804,7 +804,7 @@ static int megasas_ctrl_get_info(MegasasState *s, MegasasCmd *cmd)
MFI_INFO_LDOPS_READ_POLICY);
info.max_strips_per_io = cpu_to_le16(s->fw_sge);
info.stripe_sz_ops.min = 3;
info.stripe_sz_ops.max = ffs(MEGASAS_MAX_SECTORS + 1) - 1;
info.stripe_sz_ops.max = ctz32(MEGASAS_MAX_SECTORS + 1);
info.properties.pred_fail_poll_interval = cpu_to_le16(300);
info.properties.intr_throttle_cnt = cpu_to_le16(16);
info.properties.intr_throttle_timeout = cpu_to_le16(50);

16
include/hw/pci/pci.h
View file

@ -568,7 +568,7 @@ static inline void
pci_set_byte_by_mask(uint8_t *config, uint8_t mask, uint8_t reg)
{
uint8_t val = pci_get_byte(config);
uint8_t rval = reg << (ffs(mask) - 1);
uint8_t rval = reg << ctz32(mask);
pci_set_byte(config, (~mask & val) | (mask & rval));
}
@ -576,14 +576,14 @@ static inline uint8_t
pci_get_byte_by_mask(uint8_t *config, uint8_t mask)
{
uint8_t val = pci_get_byte(config);
return (val & mask) >> (ffs(mask) - 1);
return (val & mask) >> ctz32(mask);
}
static inline void
pci_set_word_by_mask(uint8_t *config, uint16_t mask, uint16_t reg)
{
uint16_t val = pci_get_word(config);
uint16_t rval = reg << (ffs(mask) - 1);
uint16_t rval = reg << ctz32(mask);
pci_set_word(config, (~mask & val) | (mask & rval));
}
@ -591,14 +591,14 @@ static inline uint16_t
pci_get_word_by_mask(uint8_t *config, uint16_t mask)
{
uint16_t val = pci_get_word(config);
return (val & mask) >> (ffs(mask) - 1);
return (val & mask) >> ctz32(mask);
}
static inline void
pci_set_long_by_mask(uint8_t *config, uint32_t mask, uint32_t reg)
{
uint32_t val = pci_get_long(config);
uint32_t rval = reg << (ffs(mask) - 1);
uint32_t rval = reg << ctz32(mask);
pci_set_long(config, (~mask & val) | (mask & rval));
}
@ -606,14 +606,14 @@ static inline uint32_t
pci_get_long_by_mask(uint8_t *config, uint32_t mask)
{
uint32_t val = pci_get_long(config);
return (val & mask) >> (ffs(mask) - 1);
return (val & mask) >> ctz32(mask);
}
static inline void
pci_set_quad_by_mask(uint8_t *config, uint64_t mask, uint64_t reg)
{
uint64_t val = pci_get_quad(config);
uint64_t rval = reg << (ffs(mask) - 1);
uint64_t rval = reg << ctz32(mask);
pci_set_quad(config, (~mask & val) | (mask & rval));
}
@ -621,7 +621,7 @@ static inline uint64_t
pci_get_quad_by_mask(uint8_t *config, uint64_t mask)
{
uint64_t val = pci_get_quad(config);
return (val & mask) >> (ffs(mask) - 1);
return (val & mask) >> ctz32(mask);
}
PCIDevice *pci_create_multifunction(PCIBus *bus, int devfn, bool multifunction,

18
include/hw/pci/pcie_regs.h
View file

@ -27,34 +27,34 @@
/* PCI_EXP_FLAGS */
#define PCI_EXP_FLAGS_VER2 2 /* for now, supports only ver. 2 */
#define PCI_EXP_FLAGS_IRQ_SHIFT (ffs(PCI_EXP_FLAGS_IRQ) - 1)
#define PCI_EXP_FLAGS_TYPE_SHIFT (ffs(PCI_EXP_FLAGS_TYPE) - 1)
#define PCI_EXP_FLAGS_IRQ_SHIFT ctz32(PCI_EXP_FLAGS_IRQ)
#define PCI_EXP_FLAGS_TYPE_SHIFT ctz32(PCI_EXP_FLAGS_TYPE)
/* PCI_EXP_LINK{CAP, STA} */
/* link speed */
#define PCI_EXP_LNK_LS_25 1
#define PCI_EXP_LNK_MLW_SHIFT (ffs(PCI_EXP_LNKCAP_MLW) - 1)
#define PCI_EXP_LNK_MLW_SHIFT ctz32(PCI_EXP_LNKCAP_MLW)
#define PCI_EXP_LNK_MLW_1 (1 << PCI_EXP_LNK_MLW_SHIFT)
/* PCI_EXP_LINKCAP */
#define PCI_EXP_LNKCAP_ASPMS_SHIFT (ffs(PCI_EXP_LNKCAP_ASPMS) - 1)
#define PCI_EXP_LNKCAP_ASPMS_SHIFT ctz32(PCI_EXP_LNKCAP_ASPMS)
#define PCI_EXP_LNKCAP_ASPMS_0S (1 << PCI_EXP_LNKCAP_ASPMS_SHIFT)
#define PCI_EXP_LNKCAP_PN_SHIFT (ffs(PCI_EXP_LNKCAP_PN) - 1)
#define PCI_EXP_LNKCAP_PN_SHIFT ctz32(PCI_EXP_LNKCAP_PN)
#define PCI_EXP_SLTCAP_PSN_SHIFT (ffs(PCI_EXP_SLTCAP_PSN) - 1)
#define PCI_EXP_SLTCAP_PSN_SHIFT ctz32(PCI_EXP_SLTCAP_PSN)
#define PCI_EXP_SLTCTL_IND_RESERVED 0x0
#define PCI_EXP_SLTCTL_IND_ON 0x1
#define PCI_EXP_SLTCTL_IND_BLINK 0x2
#define PCI_EXP_SLTCTL_IND_OFF 0x3
#define PCI_EXP_SLTCTL_AIC_SHIFT (ffs(PCI_EXP_SLTCTL_AIC) - 1)
#define PCI_EXP_SLTCTL_AIC_SHIFT ctz32(PCI_EXP_SLTCTL_AIC)
#define PCI_EXP_SLTCTL_AIC_OFF \
(PCI_EXP_SLTCTL_IND_OFF << PCI_EXP_SLTCTL_AIC_SHIFT)
#define PCI_EXP_SLTCTL_PIC_SHIFT (ffs(PCI_EXP_SLTCTL_PIC) - 1)
#define PCI_EXP_SLTCTL_PIC_SHIFT ctz32(PCI_EXP_SLTCTL_PIC)
#define PCI_EXP_SLTCTL_PIC_OFF \
(PCI_EXP_SLTCTL_IND_OFF << PCI_EXP_SLTCTL_PIC_SHIFT)
#define PCI_EXP_SLTCTL_PIC_ON \
@ -109,7 +109,7 @@
#define PCI_ERR_ROOT_IRQ_MAX 32
#define PCI_ERR_ROOT_IRQ 0xf8000000
#define PCI_ERR_ROOT_IRQ_SHIFT (ffs(PCI_ERR_ROOT_IRQ) - 1)
#define PCI_ERR_ROOT_IRQ_SHIFT ctz32(PCI_ERR_ROOT_IRQ)
#define PCI_ERR_ROOT_STATUS_REPORT_MASK (PCI_ERR_ROOT_COR_RCV | \
PCI_ERR_ROOT_MULTI_COR_RCV | \
PCI_ERR_ROOT_UNCOR_RCV | \

4
target-ppc/cpu.h
View file

@ -2251,8 +2251,8 @@ static inline ppcmas_tlb_t *booke206_get_tlbm(CPUPPCState *env, const int tlbn,
{
int r;
uint32_t ways = booke206_tlb_ways(env, tlbn);
int ways_bits = ffs(ways) - 1;
int tlb_bits = ffs(booke206_tlb_size(env, tlbn)) - 1;
int ways_bits = ctz32(ways);
int tlb_bits = ctz32(booke206_tlb_size(env, tlbn));
int i;
way &= ways - 1;