s_mul64To128M.c File Reference

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

Include dependency graph for s_mul64To128M.c:

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Functions
void	softfloat_mul64To128M (uint64_t a, uint64_t b, uint32_t *zPtr)

Function Documentation

softfloat_mul64To128M()

void softfloat_mul64To128M	(	uint64_t	a,
		uint64_t	b,
		uint32_t *	zPtr )

Definition at line 43 of file s_mul64To128M.c.

{
    uint32_t a32, a0, b32, b0;
    uint64_t z0, mid1, z64, mid;
 
    a32 = a>>32;
    a0 = a;
    b32 = b>>32;
    b0 = b;
    z0 = (uint64_t) a0 * b0;
    mid1 = (uint64_t) a32 * b0;
    mid = mid1 + (uint64_t) a0 * b32;
    z64 = (uint64_t) a32 * b32;
    z64 += (uint64_t) (mid < mid1)<<32 | mid>>32;
    mid <<= 32;
    z0 += mid;
    zPtr[indexWord( 4, 1 )] = z0>>32;
    zPtr[indexWord( 4, 0 )] = z0;
    z64 += (z0 < mid);
    zPtr[indexWord( 4, 3 )] = z64>>32;
    zPtr[indexWord( 4, 2 )] = z64;
 
}