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56 lines
1.2 KiB
56 lines
1.2 KiB
/*[
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movsx.c
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LOCAL CHAR SccsID[]="@(#)movsx.c 1.5 02/09/94";
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MOVSX CPU 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 <movsx.h>
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/*
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=====================================================================
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EXTERNAL ROUTINES START HERE
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=====================================================================
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*/
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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/* Generic - one size fits all 'movsx'. */
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/* NB. This function sign extends to 32-bits. */
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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GLOBAL VOID
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MOVSX
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IFN3(
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IU32 *, pop1, /* pntr to dst/lsrc operand */
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IU32, op2, /* rsrc operand */
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IUM8, op_sz /* 8 or 16-bit (original rsrc operand size) */
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)
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{
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if ( SZ2MSB(op_sz) & op2 ) /* sign bit set? */
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{
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/* or in sign extension */
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op2 = op2 | ~SZ2MASK(op_sz);
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}
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*pop1 = op2;
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}
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