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rte_bitops.h(3) DPDK rte_bitops.h(3)

NAME

rte_bitops.h

SYNOPSIS

#include <stdint.h>
#include <rte_debug.h>

Macros


#define RTE_BIT64(nr) (UINT64_C(1) << (nr))
#define RTE_BIT32(nr) (UINT32_C(1) << (nr))
#define RTE_IS_POWER_OF_2(n) ((n) && !(((n) - 1) & (n)))

Functions


static uint32_t rte_bit_relaxed_get32 (unsigned int nr, volatile uint32_t *addr)
static void rte_bit_relaxed_set32 (unsigned int nr, volatile uint32_t *addr)
static void rte_bit_relaxed_clear32 (unsigned int nr, volatile uint32_t *addr)
static uint32_t rte_bit_relaxed_test_and_set32 (unsigned int nr, volatile uint32_t *addr)
static uint32_t rte_bit_relaxed_test_and_clear32 (unsigned int nr, volatile uint32_t *addr)
static uint64_t rte_bit_relaxed_get64 (unsigned int nr, volatile uint64_t *addr)
static void rte_bit_relaxed_set64 (unsigned int nr, volatile uint64_t *addr)
static void rte_bit_relaxed_clear64 (unsigned int nr, volatile uint64_t *addr)
static uint64_t rte_bit_relaxed_test_and_set64 (unsigned int nr, volatile uint64_t *addr)
static uint64_t rte_bit_relaxed_test_and_clear64 (unsigned int nr, volatile uint64_t *addr)
static unsigned int rte_clz32 (uint32_t v)
static unsigned int rte_clz64 (uint64_t v)
static unsigned int rte_ctz32 (uint32_t v)
static unsigned int rte_ctz64 (uint64_t v)
static unsigned int rte_popcount32 (uint32_t v)
static unsigned int rte_popcount64 (uint64_t v)
static uint32_t rte_combine32ms1b (uint32_t x)
static uint64_t rte_combine64ms1b (uint64_t v)
static uint32_t rte_bsf32 (uint32_t v)
static int rte_bsf32_safe (uint32_t v, uint32_t *pos)
static uint32_t rte_bsf64 (uint64_t v)
static int rte_bsf64_safe (uint64_t v, uint32_t *pos)
static uint32_t rte_fls_u32 (uint32_t x)
static uint32_t rte_fls_u64 (uint64_t x)
static int rte_is_power_of_2 (uint32_t n)
static uint32_t rte_align32pow2 (uint32_t x)
static uint32_t rte_align32prevpow2 (uint32_t x)
static uint64_t rte_align64pow2 (uint64_t v)
static uint64_t rte_align64prevpow2 (uint64_t v)
static uint32_t rte_log2_u32 (uint32_t v)
static uint32_t rte_log2_u64 (uint64_t v)

Detailed Description

Bit Operations

This file defines a family of APIs for bit operations without enforcing memory ordering.

Definition in file rte_bitops.h.

Macro Definition Documentation

#define RTE_BIT64(nr) (UINT64_C(1) << (nr))

Get the uint64_t value for a specified bit set.

Parameters

nr The bit number in range of 0 to 63.

Definition at line 32 of file rte_bitops.h.

#define RTE_BIT32(nr) (UINT32_C(1) << (nr))

Get the uint32_t value for a specified bit set.

Parameters

nr The bit number in range of 0 to 31.

Definition at line 40 of file rte_bitops.h.

#define RTE_IS_POWER_OF_2(n) ((n) && !(((n) - 1) & (n)))

Macro to return 1 if n is a power of 2, 0 otherwise

Definition at line 597 of file rte_bitops.h.

Function Documentation

static uint32_t rte_bit_relaxed_get32 (unsigned int nr, volatile uint32_t * addr) [inline], [static]

Get the target bit from a 32-bit value without memory ordering.

Parameters

nr The target bit to get.
addr The address holding the bit.

Returns

The target bit.

Definition at line 55 of file rte_bitops.h.

static void rte_bit_relaxed_set32 (unsigned int nr, volatile uint32_t * addr) [inline], [static]

Set the target bit in a 32-bit value to 1 without memory ordering.

Parameters

nr The target bit to set.
addr The address holding the bit.

Definition at line 72 of file rte_bitops.h.

static void rte_bit_relaxed_clear32 (unsigned int nr, volatile uint32_t * addr) [inline], [static]

Clear the target bit in a 32-bit value to 0 without memory ordering.

Parameters

nr The target bit to clear.
addr The address holding the bit.

Definition at line 89 of file rte_bitops.h.

static uint32_t rte_bit_relaxed_test_and_set32 (unsigned int nr, volatile uint32_t * addr) [inline], [static]

Return the original bit from a 32-bit value, then set it to 1 without memory ordering.

Parameters

nr The target bit to get and set.
addr The address holding the bit.

Returns

The original bit.

Definition at line 109 of file rte_bitops.h.

static uint32_t rte_bit_relaxed_test_and_clear32 (unsigned int nr, volatile uint32_t * addr) [inline], [static]

Return the original bit from a 32-bit value, then clear it to 0 without memory ordering.

Parameters

nr The target bit to get and clear.
addr The address holding the bit.

Returns

The original bit.

Definition at line 131 of file rte_bitops.h.

static uint64_t rte_bit_relaxed_get64 (unsigned int nr, volatile uint64_t * addr) [inline], [static]

Get the target bit from a 64-bit value without memory ordering.

Parameters

nr The target bit to get.
addr The address holding the bit.

Returns

The target bit.

Definition at line 154 of file rte_bitops.h.

static void rte_bit_relaxed_set64 (unsigned int nr, volatile uint64_t * addr) [inline], [static]

Set the target bit in a 64-bit value to 1 without memory ordering.

Parameters

nr The target bit to set.
addr The address holding the bit.

Definition at line 171 of file rte_bitops.h.

static void rte_bit_relaxed_clear64 (unsigned int nr, volatile uint64_t * addr) [inline], [static]

Clear the target bit in a 64-bit value to 0 without memory ordering.

Parameters

nr The target bit to clear.
addr The address holding the bit.

Definition at line 188 of file rte_bitops.h.

static uint64_t rte_bit_relaxed_test_and_set64 (unsigned int nr, volatile uint64_t * addr) [inline], [static]

Return the original bit from a 64-bit value, then set it to 1 without memory ordering.

Parameters

nr The target bit to get and set.
addr The address holding the bit.

Returns

The original bit.

Definition at line 208 of file rte_bitops.h.

static uint64_t rte_bit_relaxed_test_and_clear64 (unsigned int nr, volatile uint64_t * addr) [inline], [static]

Return the original bit from a 64-bit value, then clear it to 0 without memory ordering.

Parameters

nr The target bit to get and clear.
addr The address holding the bit.

Returns

The original bit.

Definition at line 230 of file rte_bitops.h.

static unsigned int rte_clz32 (uint32_t v) [inline], [static]

Get the count of leading 0-bits in v.

Parameters

v The value.

Returns

The count of leading zero bits.

Definition at line 353 of file rte_bitops.h.

static unsigned int rte_clz64 (uint64_t v) [inline], [static]

Get the count of leading 0-bits in v.

Parameters

v The value.

Returns

The count of leading zero bits.

Definition at line 367 of file rte_bitops.h.

static unsigned int rte_ctz32 (uint32_t v) [inline], [static]

Get the count of trailing 0-bits in v.

Parameters

v The value.

Returns

The count of trailing zero bits.

Definition at line 381 of file rte_bitops.h.

static unsigned int rte_ctz64 (uint64_t v) [inline], [static]

Get the count of trailing 0-bits in v.

Parameters

v The value.

Returns

The count of trailing zero bits.

Definition at line 395 of file rte_bitops.h.

static unsigned int rte_popcount32 (uint32_t v) [inline], [static]

Get the count of 1-bits in v.

Parameters

v The value.

Returns

The count of 1-bits.

Definition at line 409 of file rte_bitops.h.

static unsigned int rte_popcount64 (uint64_t v) [inline], [static]

Get the count of 1-bits in v.

Parameters

v The value.

Returns

The count of 1-bits.

Definition at line 423 of file rte_bitops.h.

static uint32_t rte_combine32ms1b (uint32_t x) [inline], [static]

Combines 32b inputs most significant set bits into the least significant bits to construct a value with the same MSBs as x but all 1's under it.

Parameters

x The integer whose MSBs need to be combined with its LSBs

Returns

The combined value.

Definition at line 441 of file rte_bitops.h.

static uint64_t rte_combine64ms1b (uint64_t v) [inline], [static]

Combines 64b inputs most significant set bits into the least significant bits to construct a value with the same MSBs as x but all 1's under it.

Parameters

v The integer whose MSBs need to be combined with its LSBs

Returns

The combined value.

Definition at line 463 of file rte_bitops.h.

static uint32_t rte_bsf32 (uint32_t v) [inline], [static]

Searches the input parameter for the least significant set bit (starting from zero). If a least significant 1 bit is found, its bit index is returned. If the content of the input parameter is zero, then the content of the return value is undefined.

Parameters

v input parameter, should not be zero.

Returns

least significant set bit in the input parameter.

Definition at line 487 of file rte_bitops.h.

static int rte_bsf32_safe (uint32_t v, uint32_t * pos) [inline], [static]

Searches the input parameter for the least significant set bit (starting from zero). Safe version (checks for input parameter being zero).

Warning

pos must be a valid pointer. It is not checked!

Parameters

v The input parameter.
pos If v was not 0, this value will contain position of least significant bit within the input parameter.

Returns

Returns 0 if v was 0, otherwise returns 1.

Definition at line 507 of file rte_bitops.h.

static uint32_t rte_bsf64 (uint64_t v) [inline], [static]

Searches the input parameter for the least significant set bit (starting from zero). If a least significant 1 bit is found, its bit index is returned. If the content of the input parameter is zero, then the content of the return value is undefined.

Parameters

v input parameter, should not be zero.

Returns

least significant set bit in the input parameter.

Definition at line 528 of file rte_bitops.h.

static int rte_bsf64_safe (uint64_t v, uint32_t * pos) [inline], [static]

Searches the input parameter for the least significant set bit (starting from zero). Safe version (checks for input parameter being zero).

Warning

pos must be a valid pointer. It is not checked!

Parameters

v The input parameter.
pos If v was not 0, this value will contain position of least significant bit within the input parameter.

Returns

Returns 0 if v was 0, otherwise returns 1.

Definition at line 548 of file rte_bitops.h.

static uint32_t rte_fls_u32 (uint32_t x) [inline], [static]

Return the last (most-significant) bit set.

Note

The last (most significant) bit is at position 32.

rte_fls_u32(0) = 0, rte_fls_u32(1) = 1, rte_fls_u32(0x80000000) = 32

Parameters

x The input parameter.

Returns

The last (most-significant) bit set, or 0 if the input is 0.

Definition at line 569 of file rte_bitops.h.

static uint32_t rte_fls_u64 (uint64_t x) [inline], [static]

Return the last (most-significant) bit set.

Note

The last (most significant) bit is at position 64.

rte_fls_u64(0) = 0, rte_fls_u64(1) = 1, rte_fls_u64(0x8000000000000000) = 64

Parameters

x The input parameter.

Returns

The last (most-significant) bit set, or 0 if the input is 0.

Definition at line 587 of file rte_bitops.h.

static int rte_is_power_of_2 (uint32_t n) [inline], [static]

Returns true if n is a power of 2

Parameters

n Number to check

Returns

1 if true, 0 otherwise

Definition at line 606 of file rte_bitops.h.

static uint32_t rte_align32pow2 (uint32_t x) [inline], [static]

Aligns input parameter to the next power of 2

Parameters

x The integer value to align

Returns

Input parameter aligned to the next power of 2

Definition at line 621 of file rte_bitops.h.

static uint32_t rte_align32prevpow2 (uint32_t x) [inline], [static]

Aligns input parameter to the previous power of 2

Parameters

x The integer value to align

Returns

Input parameter aligned to the previous power of 2

Definition at line 639 of file rte_bitops.h.

static uint64_t rte_align64pow2 (uint64_t v) [inline], [static]

Aligns 64b input parameter to the next power of 2

Parameters

v The 64b value to align

Returns

Input parameter aligned to the next power of 2

Definition at line 656 of file rte_bitops.h.

static uint64_t rte_align64prevpow2 (uint64_t v) [inline], [static]

Aligns 64b input parameter to the previous power of 2

Parameters

v The 64b value to align

Returns

Input parameter aligned to the previous power of 2

Definition at line 674 of file rte_bitops.h.

static uint32_t rte_log2_u32 (uint32_t v) [inline], [static]

Return the rounded-up log2 of a integer.

Note

Contrary to the logarithm mathematical operation, rte_log2_u32(0) == 0 and not -inf.

Parameters

v The input parameter.

Returns

The rounded-up log2 of the input, or 0 if the input is 0.

Definition at line 693 of file rte_bitops.h.

static uint32_t rte_log2_u64 (uint64_t v) [inline], [static]

Return the rounded-up log2 of a 64-bit integer.

Note

Contrary to the logarithm mathematical operation, rte_log2_u64(0) == 0 and not -inf.

Parameters

v The input parameter.

Returns

The rounded-up log2 of the input, or 0 if the input is 0.

Definition at line 713 of file rte_bitops.h.

Author

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