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[MIPS] Cleanup fls implementation. 

fls was the only called of flz, so fold flz into fls, same for the
__ilog2 call.  Delete the now unused flz function.
    
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2006-01-30 17:14:41 +00:00
parent 2e66fe24d6
commit 2caf190002
1 changed files with 45 additions and 39 deletions
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84
include/asm-mips/bitops.h
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@ -643,44 +643,6 @@ static inline unsigned long ffz(unsigned long word)
return __ffs (~word); return __ffs (~word);
} }
/*
* flz - find last zero in word.
* @word: The word to search
*
* Returns 0..SZLONG-1
* Undefined if no zero exists, so code should check against ~0UL first.
*/
static inline unsigned long flz(unsigned long word)
{
#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
return __ilog2(~word);
#else
#ifdef CONFIG_32BIT
int r = 31, s;
word = ~word;
s = 16; if ((word & 0xffff0000)) s = 0; r -= s; word <<= s;
s = 8; if ((word & 0xff000000)) s = 0; r -= s; word <<= s;
s = 4; if ((word & 0xf0000000)) s = 0; r -= s; word <<= s;
s = 2; if ((word & 0xc0000000)) s = 0; r -= s; word <<= s;
s = 1; if ((word & 0x80000000)) s = 0; r -= s;
return r;
#endif
#ifdef CONFIG_64BIT
int r = 63, s;
word = ~word;
s = 32; if ((word & 0xffffffff00000000UL)) s = 0; r -= s; word <<= s;
s = 16; if ((word & 0xffff000000000000UL)) s = 0; r -= s; word <<= s;
s = 8; if ((word & 0xff00000000000000UL)) s = 0; r -= s; word <<= s;
s = 4; if ((word & 0xf000000000000000UL)) s = 0; r -= s; word <<= s;
s = 2; if ((word & 0xc000000000000000UL)) s = 0; r -= s; word <<= s;
s = 1; if ((word & 0x8000000000000000UL)) s = 0; r -= s;
return r;
#endif
#endif
}
/* /*
* fls - find last bit set. * fls - find last bit set.
* @word: The word to search * @word: The word to search
@ -690,11 +652,55 @@ static inline unsigned long flz(unsigned long word)
*/ */
static inline unsigned long fls(unsigned long word) static inline unsigned long fls(unsigned long word)
{ {
#ifdef CONFIG_32BIT
#ifdef CONFIG_CPU_MIPS32
__asm__ ("clz %0, %1" : "=r" (word) : "r" (word));
return 32 - word;
#else
{
int r = 32, s;
if (word == 0) if (word == 0)
return 0; return 0;
return flz(~word) + 1; s = 16; if ((word & 0xffff0000)) s = 0; r -= s; word <<= s;
s = 8; if ((word & 0xff000000)) s = 0; r -= s; word <<= s;
s = 4; if ((word & 0xf0000000)) s = 0; r -= s; word <<= s;
s = 2; if ((word & 0xc0000000)) s = 0; r -= s; word <<= s;
s = 1; if ((word & 0x80000000)) s = 0; r -= s;
return r;
}
#endif
#endif /* CONFIG_32BIT */
#ifdef CONFIG_64BIT
#ifdef CONFIG_CPU_MIPS64
__asm__ ("dclz %0, %1" : "=r" (word) : "r" (word));
return 64 - word;
#else
{
int r = 64, s;
if (word == 0)
return 0;
s = 32; if ((word & 0xffffffff00000000UL)) s = 0; r -= s; word <<= s;
s = 16; if ((word & 0xffff000000000000UL)) s = 0; r -= s; word <<= s;
s = 8; if ((word & 0xff00000000000000UL)) s = 0; r -= s; word <<= s;
s = 4; if ((word & 0xf000000000000000UL)) s = 0; r -= s; word <<= s;
s = 2; if ((word & 0xc000000000000000UL)) s = 0; r -= s; word <<= s;
s = 1; if ((word & 0x8000000000000000UL)) s = 0; r -= s;
return r;
}
#endif
#endif /* CONFIG_64BIT */
} }
#define fls64(x) generic_fls64(x) #define fls64(x) generic_fls64(x)
/* /*