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Coldfire: assembler optimised SWAB32() inline function. Added SWAW32() even if it isn't currently used.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7379 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2005-08-21 22:43:00 +00:00
parent 9757dc1bea
commit 658c8451ea
1 changed files with 23 additions and 3 deletions
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26
firmware/export/system.h
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@ -207,6 +207,16 @@ static inline unsigned short SWAB16(unsigned short value)
return (value >> 8) | (value << 8);
}
static inline unsigned long SWAW32(unsigned long value)
/*
result[31..16] = value[15.. 0];
result[15.. 0] = value[31..16];
*/
{
asm ("swap %%0" : "+r"(value));
return value;
}
static inline unsigned long SWAB32(unsigned long value)
/*
result[31..24] = value[ 7.. 0];
@ -215,9 +225,19 @@ static inline unsigned long SWAB32(unsigned long value)
result[ 7.. 0] = value[31..24];
*/
{
unsigned short hi = SWAB16(value >> 16);
unsigned short lo = SWAB16(value & 0xffff);
return (lo << 16) | hi;
unsigned long mask = 0x00FF00FF;
asm ( /* val = ABCD */
"and.l %[val],%[mask] \n" /* mask = .B.D */
"eor.l %[mask],%[val] \n" /* val = A.C. */
"lsl.l #8,%[mask] \n" /* mask = B.D. */
"lsr.l #8,%[val] \n" /* val = .A.C */
"or.l %[mask],%[val] \n" /* val = BADC */
"swap %[val] \n" /* val = DCBA */
: /* outputs */
[val] "+d"(value),
[mask]"+d"(mask)
);
return value;
}
static inline void invalidate_icache(void)