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Asm version of bswap16().

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Obtained from: 	NetBSD
This commit is contained in:
Olivier Houchard 2005-05-24 21:43:16 +00:00
parent fa7e20fdd4
commit fdc05f7913
1 changed files with 6 additions and 5 deletions
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11
sys/arm/include/endian.h
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@ -87,16 +87,17 @@ __bswap32_var(__uint32_t v)
{
__uint32_t t1;
t1 = v ^ ((v << 16) | (v >> 16));
t1 &= 0xff00ffffU;
v = (v >> 8) | (v << 24);
v ^= (t1 >> 8);
__asm __volatile("eor %1, %0, %0, ror #16\n"
"bic %1, %1, #0x00ff0000\n"
"mov %0, %0, ror #8\n"
"eor %0, %0, %1, lsr #8\n"
: "+r" (v), "=r" (t1));
return (v);
}
static __inline __uint16_t
__bswap16_var(__uint32_t v)
__bswap16_var(__uint16_t v)
{
__asm __volatile(
"mov %0, %1, ror #8\n"