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bsps/powerpc: Add ppc_count_leading_zeros()

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Sebastian Huber
2013-07-09 16:37:32 +02:00
parent 6886a48530
commit 4fe3ad2f99
1 changed files with 13 additions and 0 deletions
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13
c/src/lib/libcpu/powerpc/shared/include/powerpc-utility.h
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@@ -407,6 +407,19 @@ static inline void ppc_external_exceptions_disable(uint32_t msr)
RTEMS_COMPILER_MEMORY_BARRIER(); RTEMS_COMPILER_MEMORY_BARRIER();
} }
static inline uint32_t ppc_count_leading_zeros(uint32_t value)
{
uint32_t count;
__asm__ (
"cntlzw %0, %1;"
: "=r" (count)
: "r" (value)
);
return count;
}
/* /*
* Simple spin delay in microsecond units for device drivers. * Simple spin delay in microsecond units for device drivers.
* This is very dependent on the clock speed of the target. * This is very dependent on the clock speed of the target.