ObjFW  Check-in [42aaecc3cd]

Overview
Comment:Add assembly implementation for OF_BSWAP{16,32,64} for x86 and AMD64.
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SHA3-256: 42aaecc3cdfdf8572f35d48d549cc3cc5b0746a1ea3aff7f7516cf0ddd802774
User & Date: js on 2009-08-28 02:12:23
Other Links: manifest | tags
Context
2009-08-28
17:57
Fix a bug in OFHashing (SHA1 didn't cache correctly in -[digit]). check-in: 6a0ac6a3f1 user: js tags: trunk
02:12
Add assembly implementation for OF_BSWAP{16,32,64} for x86 and AMD64. check-in: 42aaecc3cd user: js tags: trunk
00:33
Add OF_BSWAP{16,32,64}_IF_{BE,LE} for conditional byte swap. check-in: 30f6c422ad user: js tags: trunk
Changes
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Modified src/OFMacros.h from [8a995369a7] to [7562b69891].

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#define OF_LIKELY(cond) __builtin_expect(!!(cond), 1)
#define OF_UNLIKELY(cond) __builtin_expect(!!(cond), 0)
#else
#define OF_INLINE inline
#define OF_LIKELY(cond) cond
#define OF_UNLIKELY(cond) cond
#endif









static OF_INLINE uint16_t
OF_BSWAP16(uint16_t i)
{



	i = (i & UINT16_C(0xFF00)) >> 8 |
	    (i & UINT16_C(0x00FF)) << 8;

	return i;
}

static OF_INLINE uint32_t
OF_BSWAP32(uint32_t i)
{



	i = (i & UINT32_C(0xFF000000)) >> 24 |
	    (i & UINT32_C(0x00FF0000)) >>  8 |
	    (i & UINT32_C(0x0000FF00)) <<  8 |
	    (i & UINT32_C(0x000000FF)) << 24;

	return i;
}

static OF_INLINE uint64_t
OF_BSWAP64(uint64_t i)
{







	i = (i & UINT64_C(0xFF00000000000000)) >> 56 |
	    (i & UINT64_C(0x00FF000000000000)) >> 40 |
	    (i & UINT64_C(0x0000FF0000000000)) >> 24 |
	    (i & UINT64_C(0x000000FF00000000)) >>  8 |
	    (i & UINT64_C(0x00000000FF000000)) <<  8 |
	    (i & UINT64_C(0x0000000000FF0000)) << 24 |
	    (i & UINT64_C(0x000000000000FF00)) << 40 |
	    (i & UINT64_C(0x00000000000000FF)) << 56;

	return i;
}

static OF_INLINE void
OF_BSWAP32_V(uint32_t *buf, size_t len)
{
	while (len--) {








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#define OF_LIKELY(cond) __builtin_expect(!!(cond), 1)
#define OF_UNLIKELY(cond) __builtin_expect(!!(cond), 0)
#else
#define OF_INLINE inline
#define OF_LIKELY(cond) cond
#define OF_UNLIKELY(cond) cond
#endif

#ifdef __GNUC__
#if defined(__amd64__) || defined(__x86_64__)
#define OF_AMD64_ASM
#elif defined(__i386__)
#define OF_X86_ASM
#endif
#endif

static OF_INLINE uint16_t
OF_BSWAP16(uint16_t i)
{
#if defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	asm("xchgb	%h0, %b0" : "=Q"(i) : "Q"(i));
#else
	i = (i & UINT16_C(0xFF00)) >> 8 |
	    (i & UINT16_C(0x00FF)) << 8;
#endif
	return i;
}

static OF_INLINE uint32_t
OF_BSWAP32(uint32_t i)
{
#if defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
	asm("bswap	%0" : "=q"(i) : "q"(i));
#else
	i = (i & UINT32_C(0xFF000000)) >> 24 |
	    (i & UINT32_C(0x00FF0000)) >>  8 |
	    (i & UINT32_C(0x0000FF00)) <<  8 |
	    (i & UINT32_C(0x000000FF)) << 24;
#endif
	return i;
}

static OF_INLINE uint64_t
OF_BSWAP64(uint64_t i)
{
#if defined(OF_AMD64_ASM)
	asm("bswap	%0" : "=r"(i) : "r"(i));
#elif defined(OF_X86_ASM)
	asm("bswap	%%eax\n\t"
	    "bswap	%%edx\n\t"
	    "xchgl	%%eax, %%edx" : "=A"(i): "A"(i));
#else
	i = (i & UINT64_C(0xFF00000000000000)) >> 56 |
	    (i & UINT64_C(0x00FF000000000000)) >> 40 |
	    (i & UINT64_C(0x0000FF0000000000)) >> 24 |
	    (i & UINT64_C(0x000000FF00000000)) >>  8 |
	    (i & UINT64_C(0x00000000FF000000)) <<  8 |
	    (i & UINT64_C(0x0000000000FF0000)) << 24 |
	    (i & UINT64_C(0x000000000000FF00)) << 40 |
	    (i & UINT64_C(0x00000000000000FF)) << 56;
#endif
	return i;
}

static OF_INLINE void
OF_BSWAP32_V(uint32_t *buf, size_t len)
{
	while (len--) {
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