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qemu
提交 612d590e 编写于 作者: R Richard Henderson 提交者： Blue Swirl
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bswap: Rewrite all ld<type>_<endian>_p functions 

Use the new host endian unaligned access functions instead of
open coding byte-by-byte references.  Remove assembly special
cases for i386 and ppc -- we've now exposed the operation to
the compiler sufficiently for these to be optimized automatically.
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
上级 7db2145a
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Showing with 30 addition and 270 deletion
include/qemu/bswap.h
浏览文件 @ 612d590e
......@@ -215,11 +215,6 @@ static inline void cpu_to_be64wu(uint64_t *p, uint64_t v)
#define leul_to_cpu(v) (v)
#endif
#undef le_bswap
#undef be_bswap
#undef le_bswaps
#undef be_bswaps
/* len must be one of 1, 2, 4 */
static inline uint32_t qemu_bswap_len(uint32_t value, int len)
{
......@@ -377,115 +372,61 @@ static inline void stq_p(void *ptr, uint64_t v)
memcpy(ptr, &v, sizeof(v));
}
/* NOTE: on arm, putting 2 in /proc/sys/debug/alignment so that the
kernel handles unaligned load/stores may give better results, but
it is a system wide setting : bad */
#if defined(HOST_WORDS_BIGENDIAN) || defined(WORDS_ALIGNED)
/* conservative code for little endian unaligned accesses */
static inline int lduw_le_p(const void *ptr)
{
#ifdef _ARCH_PPC
int val;
__asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (ptr));
return val;
#else
const uint8_t *p = ptr;
return p[0] | (p[1] << 8);
#endif
return (uint16_t)le_bswap(lduw_p(ptr), 16);
}
static inline int ldsw_le_p(const void *ptr)
{
#ifdef _ARCH_PPC
int val;
__asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (ptr));
return (int16_t)val;
#else
const uint8_t *p = ptr;
return (int16_t)(p[0] | (p[1] << 8));
#endif
return (int16_t)le_bswap(lduw_p(ptr), 16);
}
static inline int ldl_le_p(const void *ptr)
{
#ifdef _ARCH_PPC
int val;
__asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (ptr));
return val;
#else
const uint8_t *p = ptr;
return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
#endif
return le_bswap(ldl_p(ptr), 32);
}
static inline uint64_t ldq_le_p(const void *ptr)
{
const uint8_t *p = ptr;
uint32_t v1, v2;
v1 = ldl_le_p(p);
v2 = ldl_le_p(p + 4);
return v1 | ((uint64_t)v2 << 32);
return le_bswap(ldq_p(ptr), 64);
}
static inline void stw_le_p(void *ptr, int v)
{
#ifdef _ARCH_PPC
__asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*(uint16_t *)ptr) : "r" (v), "r" (ptr));
#else
uint8_t *p = ptr;
p[0] = v;
p[1] = v >> 8;
#endif
stw_p(ptr, le_bswap(v, 16));
}
static inline void stl_le_p(void *ptr, int v)
{
#ifdef _ARCH_PPC
__asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*(uint32_t *)ptr) : "r" (v), "r" (ptr));
#else
uint8_t *p = ptr;
p[0] = v;
p[1] = v >> 8;
p[2] = v >> 16;
p[3] = v >> 24;
#endif
stl_p(ptr, le_bswap(v, 32));
}
static inline void stq_le_p(void *ptr, uint64_t v)
{
uint8_t *p = ptr;
stl_le_p(p, (uint32_t)v);
stl_le_p(p + 4, v >> 32);
stq_p(ptr, le_bswap(v, 64));
}
/* float access */
static inline float32 ldfl_le_p(const void *ptr)
{
union {
float32 f;
uint32_t i;
} u;
u.i = ldl_le_p(ptr);
CPU_FloatU u;
u.l = ldl_le_p(ptr);
return u.f;
}
static inline void stfl_le_p(void *ptr, float32 v)
{
union {
float32 f;
uint32_t i;
} u;
CPU_FloatU u;
u.f = v;
stl_le_p(ptr, u.i);
stl_le_p(ptr, u.l);
}
static inline float64 ldfq_le_p(const void *ptr)
{
CPU_DoubleU u;
u.l.lower = ldl_le_p(ptr);
u.l.upper = ldl_le_p(ptr + 4);
u.ll = ldq_le_p(ptr);
return u.d;
}
......@@ -493,188 +434,64 @@ static inline void stfq_le_p(void *ptr, float64 v)
{
CPU_DoubleU u;
u.d = v;
stl_le_p(ptr, u.l.lower);
stl_le_p(ptr + 4, u.l.upper);
stq_le_p(ptr, u.ll);
}
#else
static inline int lduw_le_p(const void *ptr)
{
return *(uint16_t *)ptr;
}
static inline int ldsw_le_p(const void *ptr)
{
return *(int16_t *)ptr;
}
static inline int ldl_le_p(const void *ptr)
{
return *(uint32_t *)ptr;
}
static inline uint64_t ldq_le_p(const void *ptr)
{
return *(uint64_t *)ptr;
}
static inline void stw_le_p(void *ptr, int v)
{
*(uint16_t *)ptr = v;
}
static inline void stl_le_p(void *ptr, int v)
{
*(uint32_t *)ptr = v;
}
static inline void stq_le_p(void *ptr, uint64_t v)
{
*(uint64_t *)ptr = v;
}
/* float access */
static inline float32 ldfl_le_p(const void *ptr)
{
return *(float32 *)ptr;
}
static inline float64 ldfq_le_p(const void *ptr)
{
return *(float64 *)ptr;
}
static inline void stfl_le_p(void *ptr, float32 v)
{
*(float32 *)ptr = v;
}
static inline void stfq_le_p(void *ptr, float64 v)
{
*(float64 *)ptr = v;
}
#endif
#if !defined(HOST_WORDS_BIGENDIAN) || defined(WORDS_ALIGNED)
static inline int lduw_be_p(const void *ptr)
{
#if defined(__i386__)
int val;
asm volatile ("movzwl %1, %0\n"
"xchgb %b0, %h0\n"
: "=q" (val)
: "m" (*(uint16_t *)ptr));
return val;
#else
const uint8_t *b = ptr;
return ((b[0] << 8) | b[1]);
#endif
return (uint16_t)be_bswap(lduw_p(ptr), 16);
}
static inline int ldsw_be_p(const void *ptr)
{
#if defined(__i386__)
int val;
asm volatile ("movzwl %1, %0\n"
"xchgb %b0, %h0\n"
: "=q" (val)
: "m" (*(uint16_t *)ptr));
return (int16_t)val;
#else
const uint8_t *b = ptr;
return (int16_t)((b[0] << 8) | b[1]);
#endif
return (int16_t)be_bswap(lduw_p(ptr), 16);
}
static inline int ldl_be_p(const void *ptr)
{
#if defined(__i386__) || defined(__x86_64__)
int val;
asm volatile ("movl %1, %0\n"
"bswap %0\n"
: "=r" (val)
: "m" (*(uint32_t *)ptr));
return val;
#else
const uint8_t *b = ptr;
return (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | b[3];
#endif
return be_bswap(ldl_p(ptr), 32);
}
static inline uint64_t ldq_be_p(const void *ptr)
{
uint32_t a,b;
a = ldl_be_p(ptr);
b = ldl_be_p((uint8_t *)ptr + 4);
return (((uint64_t)a<<32)|b);
return be_bswap(ldq_p(ptr), 64);
}
static inline void stw_be_p(void *ptr, int v)
{
#if defined(__i386__)
asm volatile ("xchgb %b0, %h0\n"
"movw %w0, %1\n"
: "=q" (v)
: "m" (*(uint16_t *)ptr), "0" (v));
#else
uint8_t *d = (uint8_t *) ptr;
d[0] = v >> 8;
d[1] = v;
#endif
stw_p(ptr, be_bswap(v, 16));
}
static inline void stl_be_p(void *ptr, int v)
{
#if defined(__i386__) || defined(__x86_64__)
asm volatile ("bswap %0\n"
"movl %0, %1\n"
: "=r" (v)
: "m" (*(uint32_t *)ptr), "0" (v));
#else
uint8_t *d = (uint8_t *) ptr;
d[0] = v >> 24;
d[1] = v >> 16;
d[2] = v >> 8;
d[3] = v;
#endif
stl_p(ptr, be_bswap(v, 32));
}
static inline void stq_be_p(void *ptr, uint64_t v)
{
stl_be_p(ptr, v >> 32);
stl_be_p((uint8_t *)ptr + 4, v);
stq_p(ptr, be_bswap(v, 64));
}
/* float access */
static inline float32 ldfl_be_p(const void *ptr)
{
union {
float32 f;
uint32_t i;
} u;
u.i = ldl_be_p(ptr);
CPU_FloatU u;
u.l = ldl_be_p(ptr);
return u.f;
}
static inline void stfl_be_p(void *ptr, float32 v)
{
union {
float32 f;
uint32_t i;
} u;
CPU_FloatU u;
u.f = v;
stl_be_p(ptr, u.i);
stl_be_p(ptr, u.l);
}
static inline float64 ldfq_be_p(const void *ptr)
{
CPU_DoubleU u;
u.l.upper = ldl_be_p(ptr);
u.l.lower = ldl_be_p((uint8_t *)ptr + 4);
u.ll = ldq_be_p(ptr);
return u.d;
}
......@@ -682,69 +499,12 @@ static inline void stfq_be_p(void *ptr, float64 v)
{
CPU_DoubleU u;
u.d = v;
stl_be_p(ptr, u.l.upper);
stl_be_p((uint8_t *)ptr + 4, u.l.lower);
}
#else
static inline int lduw_be_p(const void *ptr)
{
return *(uint16_t *)ptr;
}
static inline int ldsw_be_p(const void *ptr)
{
return *(int16_t *)ptr;
}
static inline int ldl_be_p(const void *ptr)
{
return *(uint32_t *)ptr;
}
static inline uint64_t ldq_be_p(const void *ptr)
{
return *(uint64_t *)ptr;
}
static inline void stw_be_p(void *ptr, int v)
{
*(uint16_t *)ptr = v;
}
static inline void stl_be_p(void *ptr, int v)
{
*(uint32_t *)ptr = v;
}
static inline void stq_be_p(void *ptr, uint64_t v)
{
*(uint64_t *)ptr = v;
}
/* float access */
static inline float32 ldfl_be_p(const void *ptr)
{
return *(float32 *)ptr;
}
static inline float64 ldfq_be_p(const void *ptr)
{
return *(float64 *)ptr;
}
static inline void stfl_be_p(void *ptr, float32 v)
{
*(float32 *)ptr = v;
}
static inline void stfq_be_p(void *ptr, float64 v)
{
*(float64 *)ptr = v;
stq_be_p(ptr, u.ll);
}
#endif
#undef le_bswap
#undef be_bswap
#undef le_bswaps
#undef be_bswaps
#endif /* BSWAP_H */
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