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Don't unroll a loop if x87 top of stack is different at the start and end of the loop. Fixes Battlezone.

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This commit is contained in:
SarahW 2019-05-11 11:44:33 +01:00
commit 83f2869123
3 changed files with 13 additions and 3 deletions
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5
src/codegen.c
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@ -22,9 +22,10 @@ static struct
x86seg *op_ea_seg;
uint32_t op_32;
int first_uop;
int TOP;
} codegen_instructions[MAX_INSTRUCTION_COUNT];
int codegen_get_instruction_uop(codeblock_t *block, uint32_t pc, int *first_instruction)
int codegen_get_instruction_uop(codeblock_t *block, uint32_t pc, int *first_instruction, int *TOP)
{
int c;
@ -33,6 +34,7 @@ int codegen_get_instruction_uop(codeblock_t *block, uint32_t pc, int *first_inst
if (codegen_instructions[c].pc == pc)
{
*first_instruction = c;
*TOP = codegen_instructions[c].TOP;
return codegen_instructions[c].first_uop;
}
}
@ -590,6 +592,7 @@ generate_call:
codegen_instructions[block->ins].op_ssegs = last_op_ssegs;
codegen_instructions[block->ins].op_ea_seg = last_op_ea_seg;
codegen_instructions[block->ins].op_32 = last_op_32;
codegen_instructions[block->ins].TOP = cpu_state.TOP;
codegen_instructions[block->ins].first_uop = ir->wr_pos;
codegen_timing_opcode(opcode, fetchdat, op_32, op_pc);