Commit 5ece5c51 authored by Rusty Russell's avatar Rusty Russell

xtensa: define __fls

Like fls, but can't be handed 0 and returns the bit number.
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent 5c134dad
...@@ -82,6 +82,16 @@ static inline int fls (unsigned int x) ...@@ -82,6 +82,16 @@ static inline int fls (unsigned int x)
return 32 - __cntlz(x); return 32 - __cntlz(x);
} }
/**
* __fls - find last (most-significant) set bit in a long word
* @word: the word to search
*
* Undefined if no set bit exists, so code should check against 0 first.
*/
static inline unsigned long __fls(unsigned long word)
{
return 31 - __cntlz(word);
}
#else #else
/* Use the generic implementation if we don't have the nsa/nsau instructions. */ /* Use the generic implementation if we don't have the nsa/nsau instructions. */
...@@ -90,6 +100,7 @@ static inline int fls (unsigned int x) ...@@ -90,6 +100,7 @@ static inline int fls (unsigned int x)
# include <asm-generic/bitops/__ffs.h> # include <asm-generic/bitops/__ffs.h>
# include <asm-generic/bitops/ffz.h> # include <asm-generic/bitops/ffz.h>
# include <asm-generic/bitops/fls.h> # include <asm-generic/bitops/fls.h>
# include <asm-generic/bitops/__fls.h>
#endif #endif
......
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