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/*[
bsf.c
LOCAL CHAR SccsID[]="@(#)bsf.c 1.5 02/09/94";
BSF CPU functions.
------------------
]*/
#include <insignia.h>
#include <host_def.h>
#include <xt.h>
#include <c_main.h>
#include <c_addr.h>
#include <c_bsic.h>
#include <c_prot.h>
#include <c_seg.h>
#include <c_stack.h>
#include <c_xcptn.h>
#include <c_reg.h>
#include <bsf.h>
/*
=====================================================================
EXTERNAL FUNCTIONS START HERE.
=====================================================================
*/
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
/* Generic - one size fits all 'bsf'. */
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
GLOBAL VOID
BSF
IFN2(
IU32 *, pop1, /* pntr to dst operand */
IU32, op2 /* rsrc (ie scanned) operand */
)
{
IU32 temp = 0;
if ( op2 == 0 )
{
SET_ZF(1);
/* leave dst unaltered */
}
else
{
SET_ZF(0);
while ( (op2 & BIT0_MASK) == 0 )
{
temp += 1;
op2 >>= 1;
}
*pop1 = temp;
}
}
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