mirror of
https://github.com/netwide-assembler/nasm
synced 2026-08-26 16:23:04 -04:00
1286a2da4e
Merge a bunch of common code in the handling of modr/m generation. Make the handing of compressed disp8 simpler and more transparent by exporting a the shift factor for the compressed immediate in ea_data. For the case of no compression, the shift factor is simply 0; there is no need to distinguish "compressed" from "uncompressed". The tidied up version of the disp8 code is simple enough that it makes more sense to inline it. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 1996-2024 The NASM Authors - All Rights Reserved
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* See the file AUTHORS included with the NASM distribution for
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* the specific copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following
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* conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ----------------------------------------------------------------------- */
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/*
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* disp8.h header file for disp8.c
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*/
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#ifndef NASM_DISP8_H
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#define NASM_DISP8_H
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#include "nasm.h"
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/*
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* Find shift value for compressed displacement (disp8 << shift)
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*/
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static inline unsigned int get_disp8_shift(const insn *ins)
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{
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bool evex_b;
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unsigned int evex_w;
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unsigned int vectlen;
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enum ttypes tuple;
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if (likely(!(ins->rex & REX_EV)))
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return 0;
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evex_b = !!(ins->evex & EVEX_P2B);
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tuple = ins->evex_tuple;
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vectlen = (ins->evex & EVEX_P2LL) >> 29;
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evex_w = !!(ins->evex & EVEX_P1W);
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switch(tuple) {
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/* Full, half vector unless broadcast */
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case FV:
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return evex_b ? 2 + evex_w : vectlen + 4;
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case HV:
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return evex_b ? 2 + evex_w : vectlen + 3;
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/* Full vector length */
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case FVM:
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return vectlen + 4;
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/* Fixed tuple lengths */
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case T1S8:
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return 0;
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case T1S16:
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return 1;
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case T1F32:
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return 2;
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case T1F64:
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return 3;
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case M128:
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return 4;
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/* One scalar */
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case T1S:
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return 2 + evex_w;
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/* 2, 4, 8 32/64-bit elements */
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case T2:
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return 3 + evex_w;
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case T4:
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return 4 + evex_w;
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case T8:
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return 5 + evex_w;
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/* Half, quarter, eigth mem */
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case HVM:
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return vectlen + 3;
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case QVM:
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return vectlen + 2;
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case OVM:
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return vectlen + 1;
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/* MOVDDUP */
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case DUP:
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return vectlen + 3;
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default:
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return 0;
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}
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}
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#endif /* NASM_DISP8_H */
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