s_countLeadingZeros64.c File Reference

#include <stdint.h>
#include "platform.h"
#include "primitives.h"

Include dependency graph for s_countLeadingZeros64.c:

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Macros
#define	softfloat_countLeadingZeros64   softfloat_countLeadingZeros64

Functions
uint_fast8_t	softfloat_countLeadingZeros64 (uint64_t a)

Macro Definition Documentation

softfloat_countLeadingZeros64

#define softfloat_countLeadingZeros64   softfloat_countLeadingZeros64

Definition at line 42 of file s_countLeadingZeros64.c.

Function Documentation

softfloat_countLeadingZeros64()

uint_fast8_t softfloat_countLeadingZeros64

(

uint64_t

a

)

Definition at line 45 of file s_countLeadingZeros64.c.

{
    uint_fast8_t count;
    uint32_t a32;
 
    count = 0;
    a32 = a>>32;
    if ( ! a32 ) {
        count = 32;
        a32 = a;
    }
    /*------------------------------------------------------------------------
    | From here, result is current count + count leading zeros of `a32'.
    *------------------------------------------------------------------------*/
    if ( a32 < 0x10000 ) {
        count += 16;
        a32 <<= 16;
    }
    if ( a32 < 0x1000000 ) {
        count += 8;
        a32 <<= 8;
    }
    count += softfloat_countLeadingZeros8[a32>>24];
    return count;
 
}