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https://gitlab.uni-freiburg.de/opensourcevdi/spice-protocol
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Add byteswapping macros
This commit is contained in:
Alexander Larsson
parent
73b175849c
commit
55b440f9c4
176
spice/macros.h
176
spice/macros.h
@ -183,4 +183,180 @@
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#define SPICE_UNLIKELY(expr) (expr)
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#endif
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#ifdef _MSC_VER
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#define SPICE_UINT64_CONSTANT(x) (x ## UI64)
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#define SPICE_INT64_CONSTANT(x) (x ## I64)
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#else
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#if LONG_MAX == 2147483647L
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#define SPICE_UINT64_CONSTANT(x) (x ## ULL)
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#define SPICE_INT64_CONSTANT(x) (x ## LL)
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#else
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#define SPICE_UINT64_CONSTANT(x) (x ## UL)
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#define SPICE_INT64_CONSTANT(x) (x ## L)
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#endif
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#endif
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/* Little/Bit endian byte swapping */
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#define SPICE_BYTESWAP16_CONSTANT(val) ((uint16_t) ( \
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(uint16_t) ((uint16_t) (val) >> 8) | \
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(uint16_t) ((uint16_t) (val) << 8)))
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#define SPICE_BYTESWAP32_CONSTANT(val) ((uint32_t) ( \
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(((uint32_t) (val) & (uint32_t) 0x000000ffU) << 24) | \
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(((uint32_t) (val) & (uint32_t) 0x0000ff00U) << 8) | \
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(((uint32_t) (val) & (uint32_t) 0x00ff0000U) >> 8) | \
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(((uint32_t) (val) & (uint32_t) 0xff000000U) >> 24)))
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#define SPICE_BYTESWAP64_CONSTANT(val) ((uint64_t) ( \
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(((uint64_t) (val) & \
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(uint64_t) SPICE_UINT64_CONSTANT(0x00000000000000ff)) << 56) | \
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(((uint64_t) (val) & \
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(uint64_t) SPICE_UINT64_CONSTANT(0x000000000000ff00)) << 40) | \
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(((uint64_t) (val) & \
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(uint64_t) SPICE_UINT64_CONSTANT(0x0000000000ff0000)) << 24) | \
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(((uint64_t) (val) & \
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(uint64_t) SPICE_UINT64_CONSTANT(0x00000000ff000000)) << 8) | \
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(((uint64_t) (val) & \
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(uint64_t) SPICE_UINT64_CONSTANT(0x000000ff00000000)) >> 8) | \
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(((uint64_t) (val) & \
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(uint64_t) SPICE_UINT64_CONSTANT(0x0000ff0000000000)) >> 24) | \
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(((uint64_t) (val) & \
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(uint64_t) SPICE_UINT64_CONSTANT(0x00ff000000000000)) >> 40) | \
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(((uint64_t) (val) & \
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(uint64_t) SPICE_UINT64_CONSTANT(0xff00000000000000)) >> 56)))
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/* Arch specific stuff for speed
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*/
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#if defined (__GNUC__) && (__GNUC__ >= 2) && defined (__OPTIMIZE__)
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# if defined (__i386__)
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# define SPICE_BYTESWAP16_IA32(val) \
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(__extension__ \
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({ register uint16_t __v, __x = ((uint16_t) (val)); \
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if (__builtin_constant_p (__x)) \
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__v = SPICE_BYTESWAP16_CONSTANT (__x); \
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else \
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__asm__ ("rorw $8, %w0" \
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: "=r" (__v) \
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: "0" (__x) \
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: "cc"); \
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__v; }))
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# if !defined (__i486__) && !defined (__i586__) \
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&& !defined (__pentium__) && !defined (__i686__) \
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&& !defined (__pentiumpro__) && !defined (__pentium4__)
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# define SPICE_BYTESWAP32_IA32(val) \
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(__extension__ \
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({ register uint32_t __v, __x = ((uint32_t) (val)); \
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if (__builtin_constant_p (__x)) \
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__v = SPICE_BYTESWAP32_CONSTANT (__x); \
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else \
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__asm__ ("rorw $8, %w0\n\t" \
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"rorl $16, %0\n\t" \
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"rorw $8, %w0" \
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: "=r" (__v) \
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: "0" (__x) \
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: "cc"); \
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__v; }))
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# else /* 486 and higher has bswap */
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# define SPICE_BYTESWAP32_IA32(val) \
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(__extension__ \
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({ register uint32_t __v, __x = ((uint32_t) (val)); \
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if (__builtin_constant_p (__x)) \
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__v = SPICE_BYTESWAP32_CONSTANT (__x); \
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else \
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__asm__ ("bswap %0" \
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: "=r" (__v) \
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: "0" (__x)); \
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__v; }))
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# endif /* processor specific 32-bit stuff */
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# define SPICE_BYTESWAP64_IA32(val) \
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(__extension__ \
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({ union { uint64_t __ll; \
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uint32_t __l[2]; } __w, __r; \
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__w.__ll = ((uint64_t) (val)); \
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if (__builtin_constant_p (__w.__ll)) \
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__r.__ll = SPICE_BYTESWAP64_CONSTANT (__w.__ll); \
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else \
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{ \
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__r.__l[0] = SPICE_BYTESWAP32 (__w.__l[1]); \
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__r.__l[1] = SPICE_BYTESWAP32 (__w.__l[0]); \
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} \
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__r.__ll; }))
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/* Possibly just use the constant version and let gcc figure it out? */
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# define SPICE_BYTESWAP16(val) (SPICE_BYTESWAP16_IA32 (val))
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# define SPICE_BYTESWAP32(val) (SPICE_BYTESWAP32_IA32 (val))
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# define SPICE_BYTESWAP64(val) (SPICE_BYTESWAP64_IA32 (val))
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# elif defined (__ia64__)
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# define SPICE_BYTESWAP16_IA64(val) \
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(__extension__ \
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({ register uint16_t __v, __x = ((uint16_t) (val)); \
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if (__builtin_constant_p (__x)) \
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__v = SPICE_BYTESWAP16_CONSTANT (__x); \
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else \
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__asm__ __volatile__ ("shl %0 = %1, 48 ;;" \
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"mux1 %0 = %0, @rev ;;" \
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: "=r" (__v) \
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: "r" (__x)); \
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__v; }))
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# define SPICE_BYTESWAP32_IA64(val) \
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(__extension__ \
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({ register uint32_t __v, __x = ((uint32_t) (val)); \
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if (__builtin_constant_p (__x)) \
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__v = SPICE_BYTESWAP32_CONSTANT (__x); \
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else \
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__asm__ __volatile__ ("shl %0 = %1, 32 ;;" \
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"mux1 %0 = %0, @rev ;;" \
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: "=r" (__v) \
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: "r" (__x)); \
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__v; }))
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# define SPICE_BYTESWAP64_IA64(val) \
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(__extension__ \
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({ register uint64_t __v, __x = ((uint64_t) (val)); \
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if (__builtin_constant_p (__x)) \
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__v = SPICE_BYTESWAP64_CONSTANT (__x); \
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else \
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__asm__ __volatile__ ("mux1 %0 = %1, @rev ;;" \
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: "=r" (__v) \
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: "r" (__x)); \
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__v; }))
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# define SPICE_BYTESWAP16(val) (SPICE_BYTESWAP16_IA64 (val))
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# define SPICE_BYTESWAP32(val) (SPICE_BYTESWAP32_IA64 (val))
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# define SPICE_BYTESWAP64(val) (SPICE_BYTESWAP64_IA64 (val))
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# elif defined (__x86_64__)
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# define SPICE_BYTESWAP32_X86_64(val) \
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(__extension__ \
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({ register uint32_t __v, __x = ((uint32_t) (val)); \
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if (__builtin_constant_p (__x)) \
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__v = SPICE_BYTESWAP32_CONSTANT (__x); \
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else \
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__asm__ ("bswapl %0" \
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: "=r" (__v) \
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: "0" (__x)); \
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__v; }))
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# define SPICE_BYTESWAP64_X86_64(val) \
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(__extension__ \
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({ register uint64_t __v, __x = ((uint64_t) (val)); \
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if (__builtin_constant_p (__x)) \
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__v = SPICE_BYTESWAP64_CONSTANT (__x); \
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else \
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__asm__ ("bswapq %0" \
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: "=r" (__v) \
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: "0" (__x)); \
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__v; }))
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/* gcc seems to figure out optimal code for this on its own */
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# define SPICE_BYTESWAP16(val) (SPICE_BYTESWAP16_CONSTANT (val))
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# define SPICE_BYTESWAP32(val) (SPICE_BYTESWAP32_X86_64 (val))
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# define SPICE_BYTESWAP64(val) (SPICE_BYTESWAP64_X86_64 (val))
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# else /* generic gcc */
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# define SPICE_BYTESWAP16(val) (SPICE_BYTESWAP16_CONSTANT (val))
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# define SPICE_BYTESWAP32(val) (SPICE_BYTESWAP32_CONSTANT (val))
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# define SPICE_BYTESWAP64(val) (SPICE_BYTESWAP64_CONSTANT (val))
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# endif
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#else /* generic */
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# define SPICE_BYTESWAP16(val) (SPICE_BYTESWAP16_CONSTANT (val))
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# define SPICE_BYTESWAP32(val) (SPICE_BYTESWAP32_CONSTANT (val))
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# define SPICE_BYTESWAP64(val) (SPICE_BYTESWAP64_CONSTANT (val))
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#endif /* generic */
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#endif /* _H_SPICE_MACROS */
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@ -36,5 +36,6 @@
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* If they are not in stdint.h on your system,
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* include the right one here. */
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#include <stdint.h>
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#include <limits.h>
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#endif /* _H_SPICE_TYPES */
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