arch-ppc.h File Reference

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Data Structures
struct	pg_atomic_uint32

Macros
#define	PG_HAVE_ATOMIC_U32_SUPPORT
#define	PG_HAVE_ATOMIC_COMPARE_EXCHANGE_U32
#define	PG_HAVE_ATOMIC_FETCH_ADD_U32
#define	PG_HAVE_8BYTE_SINGLE_COPY_ATOMICITY

Typedefs
typedef struct pg_atomic_uint32	pg_atomic_uint32

Functions
static bool	pg_atomic_compare_exchange_u32_impl (volatile pg_atomic_uint32 *ptr, uint32 *expected, uint32 newval)
static uint32	pg_atomic_fetch_add_u32_impl (volatile pg_atomic_uint32 *ptr, int32 add_)

Macro Definition Documentation

PG_HAVE_8BYTE_SINGLE_COPY_ATOMICITY

#define PG_HAVE_8BYTE_SINGLE_COPY_ATOMICITY

Definition at line 254 of file arch-ppc.h.

PG_HAVE_ATOMIC_COMPARE_EXCHANGE_U32

#define PG_HAVE_ATOMIC_COMPARE_EXCHANGE_U32

Definition at line 78 of file arch-ppc.h.

PG_HAVE_ATOMIC_FETCH_ADD_U32

#define PG_HAVE_ATOMIC_FETCH_ADD_U32

Definition at line 129 of file arch-ppc.h.

PG_HAVE_ATOMIC_U32_SUPPORT

#define PG_HAVE_ATOMIC_U32_SUPPORT

Definition at line 28 of file arch-ppc.h.

Typedef Documentation

pg_atomic_uint32

typedef struct pg_atomic_uint32 pg_atomic_uint32

Function Documentation

pg_atomic_compare_exchange_u32_impl()

static bool pg_atomic_compare_exchange_u32_impl ( volatile pg_atomic_uint32 *  ptr, uint32 *  expected, uint32  newval  )

inlinestatic

Definition at line 80 of file arch-ppc.h.

{
    uint32 found;
    uint32 condition_register;
    bool ret;
 
#ifdef HAVE_I_CONSTRAINT__BUILTIN_CONSTANT_P
    if (__builtin_constant_p(*expected) &&
        (int32) *expected <= PG_INT16_MAX &&
        (int32) *expected >= PG_INT16_MIN)
        __asm__ __volatile__(
            "   sync                \n"
            "   lwarx   %0,0,%5,1   \n"
            "   cmpwi   %0,%3       \n"
            "   bne     $+12        \n"     /* branch to lwsync */
            "   stwcx.  %4,0,%5     \n"
            "   bne     $-16        \n"     /* branch to lwarx */
            "   lwsync              \n"
            "   mfcr    %1          \n"
:           "=&r"(found), "=r"(condition_register), "+m"(ptr->value)
:           "i"(*expected), "r"(newval), "r"(&ptr->value)
:           "memory", "cc");
    else
#endif
        __asm__ __volatile__(
            "   sync                \n"
            "   lwarx   %0,0,%5,1   \n"
            "   cmpw    %0,%3       \n"
            "   bne     $+12        \n"     /* branch to lwsync */
            "   stwcx.  %4,0,%5     \n"
            "   bne     $-16        \n"     /* branch to lwarx */
            "   lwsync              \n"
            "   mfcr    %1          \n"
:           "=&r"(found), "=r"(condition_register), "+m"(ptr->value)
:           "r"(*expected), "r"(newval), "r"(&ptr->value)
:           "memory", "cc");
 
    ret = (condition_register >> 29) & 1;   /* test eq bit of cr0 */
    if (!ret)
        *expected = found;
    return ret;
}

References newval, PG_INT16_MAX, PG_INT16_MIN, and pg_atomic_uint32::value.

pg_atomic_fetch_add_u32_impl()

static uint32 pg_atomic_fetch_add_u32_impl ( volatile pg_atomic_uint32 *  ptr, int32  add_  )

inlinestatic

Definition at line 131 of file arch-ppc.h.

{
    uint32 _t;
    uint32 res;
 
#ifdef HAVE_I_CONSTRAINT__BUILTIN_CONSTANT_P
    if (__builtin_constant_p(add_) &&
        add_ <= PG_INT16_MAX && add_ >= PG_INT16_MIN)
        __asm__ __volatile__(
            "   sync                \n"
            "   lwarx   %1,0,%4,1   \n"
            "   addi    %0,%1,%3    \n"
            "   stwcx.  %0,0,%4     \n"
            "   bne     $-12        \n"     /* branch to lwarx */
            "   lwsync              \n"
:           "=&r"(_t), "=&b"(res), "+m"(ptr->value)
:           "i"(add_), "r"(&ptr->value)
:           "memory", "cc");
    else
#endif
        __asm__ __volatile__(
            "   sync                \n"
            "   lwarx   %1,0,%4,1   \n"
            "   add     %0,%1,%3    \n"
            "   stwcx.  %0,0,%4     \n"
            "   bne     $-12        \n"     /* branch to lwarx */
            "   lwsync              \n"
:           "=&r"(_t), "=&r"(res), "+m"(ptr->value)
:           "r"(add_), "r"(&ptr->value)
:           "memory", "cc");
 
    return res;
}

References PG_INT16_MIN, res, and pg_atomic_uint32::value.