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/*
* Copyright (C) ST-Ericsson SA 2010
* Author: Jean-Philippe FASSINO <jean-philippe.fassino@stericsson.com> for ST-Ericsson.
* License terms: GNU General Public License (GPL) version 2.
*/
/*
*
*/
#include <cm/engine/utils/inc/swap.h>
/*
* Methods
*/
t_uint16 swap16(t_uint16 x)
{
return ((x >> 8) |
((x << 8) & 0xff00U));
}
#ifdef LINUX
#if defined(__STN_8815) /* __STN_8815 -> ARMv5*/
t_uint32 swap32(t_uint32 x)
{
asm volatile (
"EOR r1, r0, r0, ROR #16 \n\t"
"BIC r1, r1, #0xFF0000 \n\t"
"MOV r0, r0, ROR #8 \n\t"
"EOR r0, r0, r1, LSR #8"
: : : "r3" );
return x;
}
t_uint64 swap64(t_uint64 x)
{
asm volatile (
"MOV r2, r1 \n\t"
" \n\t"
"EOR r3, r0, r0, ROR #16 \n\t"
"BIC r3, r3, #0xFF0000 \n\t"
"MOV r0, r0, ROR #8 \n\t"
"EOR r1, r0, r3, LSR #8 \n\t"
" \n\t"
"EOR r3, r2, r2, ROR #16 \n\t"
"BIC r3, r3, #0xFF0000 \n\t"
"MOV r2, r2, ROR #8 \n\t"
"EOR r0, r2, r3, LSR #8"
: : : "r3", "r2" );
return x;
}
#else /* -> ARMv6 or later */
t_uint32 swap32(t_uint32 x)
{
asm volatile (
"REV %0, %0"
: "+r"(x) : );
return x;
}
t_uint64 swap64(t_uint64 x)
{
asm volatile (
"REV r2, %Q0 \n\t"
"REV %Q0, %R0 \n\t"
"MOV %R0, r2"
: "+&r" (x) : : "r2" );
return x;
}
#endif
#else /* Symbian, Think -> We assume ARMCC */
#if defined(__thumb__)
t_uint32 swap32(t_uint32 x)
{
return ((x >> 24) |
((x >> 8) & 0xff00U) |
((x << 8) & 0xff0000U) |
((x << 24) & 0xff000000U));
}
t_uint64 swap64(t_uint64 x)
{
return ((x >> 56) |
((x >> 40) & 0xff00UL) |
((x >> 24) & 0xff0000UL) |
((x >> 8) & 0xff000000UL) |
((x << 8) & 0xff00000000ULL) |
((x << 24) & 0xff0000000000ULL) |
((x << 40) & 0xff000000000000ULL) |
((x << 56)));
}
#elif (__TARGET_ARCH_ARM < 6)
__asm t_uint32 swap32(t_uint32 x)
{
EOR r1, r0, r0, ROR #16
BIC r1, r1, #0xFF0000
MOV r0, r0, ROR #8
EOR r0, r0, r1, LSR #8
BX lr
}
__asm t_uint64 swap64(t_uint64 x)
{
MOV r2, r1
EOR r3, r0, r0, ROR #16 // Swap low (r0) and store it in high (r1)
BIC r3, r3, #0xFF0000
MOV r0, r0, ROR #8
EOR r1, r0, r3, LSR #8
EOR r3, r2, r2, ROR #16 // Swap high (r2 = ex r1) and store it in low (r0)
BIC r3, r3, #0xFF0000
MOV r2, r2, ROR #8
EOR r0, r2, r3, LSR #8
BX lr
}
#else /* -> ARMv6 or later */
__asm t_uint32 swap32(t_uint32 x)
{
REV r0, r0
BX lr
}
__asm t_uint64 swap64(t_uint64 x)
{
REV r2, r0
REV r0, r1
MOV r1, r2
BX lr
}
#endif
#endif
t_uint32 noswap32(t_uint32 x) {
return x;
}
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