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66 lines
1.3 KiB
66 lines
1.3 KiB
/*[
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c_neg64.c
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LOCAL CHAR SccsID[]="@(#)c_neg64.c 1.5 02/09/94";
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64-bit Negate Functions.
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------------------------
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]*/
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#include <insignia.h>
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#include <host_def.h>
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#include <xt.h>
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#include <c_main.h>
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#include <c_addr.h>
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#include <c_bsic.h>
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#include <c_prot.h>
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#include <c_seg.h>
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#include <c_stack.h>
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#include <c_xcptn.h>
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#include <c_reg.h>
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#include <c_neg64.h>
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/*
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=====================================================================
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EXTERNAL FUNCTIONS START HERE.
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=====================================================================
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*/
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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/* Do 64bit Negate. */
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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GLOBAL VOID
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neg64
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IFN2(
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IS32 *, hr, /* Pntr to high 32 bits of operand */
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IS32 *, lr /* Pntr to low 32 bits of operand */
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)
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{
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*hr = ~(*hr); /* 1's complement */
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*lr = ~(*lr);
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/* +1 ==> 2's complement */
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/*
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The only tricky case is when the addition causes a carry from
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the low to high 32-bits, but this only happens when all low
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bits are set.
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*/
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if ( *lr == 0xffffffff )
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{
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*lr = 0;
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*hr = *hr + 1;
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}
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else
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{
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*lr = *lr + 1;
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}
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}
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