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comparison z80_to_x86.c @ 716:b707a8ddc202

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Make sure z80_save_reg does nothing when there is no register in the reg field of the instruction. This fixes a bug that corrupted SP in the MDEM 2011 demo
author Michael Pavone <pavone@retrodev.com>
date Sun, 17 May 2015 20:03:27 -0700
parents 1c2020d3e275
children 9ef6db986982
comparison
equal deleted inserted replaced
715:1c2020d3e275 716:b707a8ddc202
79 } 79 }
80 80
81 void z80_save_reg(z80inst * inst, z80_options * opts) 81 void z80_save_reg(z80inst * inst, z80_options * opts)
82 { 82 {
83 code_info *code = &opts->gen.code; 83 code_info *code = &opts->gen.code;
84 if (inst->reg == Z80_USE_IMMED || inst->reg == Z80_UNUSED) {
85 return;
86 }
84 if (inst->reg == Z80_IYH) { 87 if (inst->reg == Z80_IYH) {
85 if ((inst->addr_mode & 0x1F) == Z80_REG && inst->ea_reg == Z80_IYL) { 88 if ((inst->addr_mode & 0x1F) == Z80_REG && inst->ea_reg == Z80_IYL) {
86 ror_ir(code, 8, opts->regs[Z80_IY], SZ_W); 89 ror_ir(code, 8, opts->regs[Z80_IY], SZ_W);
87 mov_rr(code, opts->gen.scratch1, opts->regs[Z80_IYL], SZ_B); 90 mov_rr(code, opts->gen.scratch1, opts->regs[Z80_IYL], SZ_B);
88 ror_ir(code, 8, opts->regs[Z80_IY], SZ_W); 91 ror_ir(code, 8, opts->regs[Z80_IY], SZ_W);