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robfinch |
// ============================================================================
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// (C) 2012 Robert Finch
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// All Rights Reserved.
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// robfinch<remove>@opencores.org
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//
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// C64 - Raptor64 'C' derived language compiler
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// - 64 bit CPU
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//
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// This source file is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This source file is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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// ============================================================================
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//
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#include <stdio.h>
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#include "c.h"
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#include "expr.h"
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#include "Statement.h"
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#include "gen.h"
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#include "cglbdec.h"
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AMODE *GenerateShift(ENODE *node,int flags, int size, int op)
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{
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AMODE *ap1, *ap2;
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ap1 = GenerateExpression(node->p[0],F_REG,size);
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ap2 = GenerateExpression(node->p[1],F_REG | F_IMMED,8);
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switch(op) {
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case op_shru:
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switch (size) {
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case 8: GenerateTriadic(op_andi,0,ap1,ap1,make_immed(0xff)); break;
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case 16: GenerateTriadic(op_andi,0,ap1,ap1,make_immed(0xffff)); break;
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case 32: GenerateTriadic(op_andi,0,ap1,ap1,make_immed(0xffffffff)); break;
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default: ;
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}
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break;
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case op_shr:
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switch (size) {
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case 8: GenerateTriadic(op_sext8,0,ap1,ap1,NULL); break;
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case 16: GenerateTriadic(op_sext16,0,ap1,ap1,NULL); break;
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case 32: GenerateTriadic(op_sext32,0,ap1,ap1,NULL); break;
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default: ;
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}
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break;
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}
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if (ap2->mode==am_immed) {
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switch(op)
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{
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case op_shl: op = op_shli; break;
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case op_shr: op = op_shri; break;
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case op_shru: op = op_shrui; break;
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}
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GenerateTriadic(op,0,ap1,ap1,make_immed(ap2->offset->i));
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}
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else
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GenerateTriadic(op,0,ap1,ap1,ap2);
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ReleaseTempRegister(ap2);
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MakeLegalAmode(ap1,flags,size);
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return ap1;
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}
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/*
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* generate shift equals operators.
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*/
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struct amode *GenerateAssignShift(ENODE *node,int flags,int size,int op)
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{
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struct amode *ap1, *ap2, *ap3;
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ap3 = GenerateExpression(node->p[0],F_ALL,size);
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ap2 = GenerateExpression(node->p[1],F_REG | F_IMMED,size);
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if (ap3->mode != am_reg) {
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ap1 = GetTempRegister();
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GenerateDiadic(op_lw,0,ap1,ap3);
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}
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else
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ap1 = ap3;
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switch(op) {
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case op_shru:
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switch (size) {
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case 8: GenerateTriadic(op_andi,0,ap1,ap1,make_immed(0xff)); break;
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case 16: GenerateTriadic(op_andi,0,ap1,ap1,make_immed(0xffff)); break;
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case 32: GenerateTriadic(op_andi,0,ap1,ap1,make_immed(0xffffffff)); break;
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default: ;
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}
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break;
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case op_shr:
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switch (size) {
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case 8: GenerateTriadic(op_sext8,0,ap1,ap1,NULL); break;
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case 16: GenerateTriadic(op_sext16,0,ap1,ap1,NULL); break;
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case 32: GenerateTriadic(op_sext32,0,ap1,ap1,NULL); break;
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default: ;
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}
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break;
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}
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if (ap2->mode==am_immed)
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GenerateTriadic(op,0,ap1,ap1,make_immed(ap2->offset->i));
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else
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GenerateTriadic(op,0,ap1,ap1,ap2);
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if (ap3->mode != am_reg) {
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GenerateDiadic(op_sw,0,ap1,ap3);
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}
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ReleaseTempRegister(ap2);
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MakeLegalAmode(ap1,flags,size);
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return ap1;
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}
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