ZealOS/src/Compiler/OptPass6.ZC

Bool OptIC6(CIntermediateCode *tmpi)
{
	CIntermediateCode *tmpil1;

	if (tmpi->ic_code < IC_IMM_I64 || !(tmpil1 = OptLag1(tmpi)))
		return FALSE;
	if (tmpil1->ic_code == IC_ADD_CONST && tmpi->ic_code == IC_DEREF && tmpi->ic_flags & ICF_ARG1_WAS_STACK &&
		tmpi->arg1.type & MDF_REG && tmpil1->res.type & MDF_REG && I32_MIN <= tmpil1->ic_data <= I32_MAX &&
		!Bt(&cmp.non_ptr_vars_mask, tmpil1->arg1.reg))
	{
		if (tmpil1->arg1.type & MDF_REG)
		{
			tmpi->ic_flags = tmpi->ic_flags & ~ICF_ARG1_WAS_STACK | tmpil1->ic_flags;
			tmpi->ic_code = IC_MOV;
			tmpi->arg1.type = MDF_DISP + tmpi->arg1_type_pointed_to;
			tmpi->arg1.reg = tmpil1->arg1.reg;
			tmpi->arg1.disp = tmpil1->ic_data;
			OptSetNOP2(tmpil1, -1);
		}
		else
		{
			tmpil1->ic_code = IC_MOV;
			tmpi->ic_code = IC_MOV;
			tmpi->arg1.type = MDF_DISP + tmpi->arg1_type_pointed_to;
			tmpi->arg1.disp = tmpil1->ic_data;
		}
		return TRUE;
	}

	return FALSE;
}

U0 OptPass6Lag(CCompCtrl *cc, CParseStack *ps, CIntermediateCode *tmpi, I64 *_stack_ptr, I64 reg_stack_size,
			   I64 *_clobbered_reg_mask)
{
	I64			 stack_ptr = *_stack_ptr, code, clobbered_stack_tmp_mask, clobbered_reg_mask = *_clobbered_reg_mask;
	CHashFun	*tmpf;

	code = tmpi->ic_code;
	if (tmpi->ic_flags & ICF_PASS_TRACE && Bt(&cc->saved_pass_trace, 6))
	{
		"%2d:", stack_ptr;
		ICPut(cc, tmpi);
	}
	if (code == IC_CALL_START)
	{
		if (reg_stack_size == 1 && stack_ptr > 0)
			clobbered_stack_tmp_mask = REGG_STACK_TMP;
		else
			clobbered_stack_tmp_mask = 0;
		if (tmpf = tmpi->ic_data)
		{
			if (Bt(&tmpf->flags, Ff_INTERNAL))
				clobbered_stack_tmp_mask = 0;
			else
			{
				clobbered_stack_tmp_mask &= tmpf->clobbered_reg_mask;
				clobbered_reg_mask |= tmpf->clobbered_reg_mask;
			}
		}
		tmpi->ic_data = clobbered_stack_tmp_mask;
		ParsePush(ps, stack_ptr);
		ParsePush(ps, clobbered_stack_tmp_mask);
	}
	else if (code == IC_CALL_END)
	{
		tmpi->ic_data = ParsePop(ps);
		stack_ptr = ParsePop(ps);
	}
	else if (code == IC_CALL_END2)
	{
		ps->ptr--;
		stack_ptr = ParsePop(ps);
	}
	if (intermediate_code_table[code].arg_count == IS_V_ARG)
		stack_ptr -= tmpi->ic_data >> 3;
	if (tmpi->arg2.type & MDF_STACK)
	{
		stack_ptr--;
		if (stack_ptr < reg_stack_size)
		{
			tmpi->arg2.type = MDF_REG + tmpi->arg2.type.raw_type;
			tmpi->arg2.reg = Bsf(REGG_STACK_TMP);
			tmpi->arg2.disp = 0;
		}
	}
	if (tmpi->arg1.type & MDF_STACK)
	{
		stack_ptr--;
		if (stack_ptr < reg_stack_size)
		{
			tmpi->arg1.type = MDF_REG + tmpi->arg1.type.raw_type;
			tmpi->arg1.reg = Bsf(REGG_STACK_TMP);
			tmpi->arg1.disp = 0;
		}
	}
	if (tmpi->res.type & MDF_STACK && !(tmpi->ic_flags & ICF_PUSH_RES))
	{
		stack_ptr++;
		if (stack_ptr <= reg_stack_size)
		{
			tmpi->res.type = MDF_REG + tmpi->res.type.raw_type;
			tmpi->res.reg = Bsf(REGG_STACK_TMP);
			clobbered_reg_mask |= REGG_STACK_TMP;
			tmpi->res.disp = 0;
		}
	}
	while (OptIC6(tmpi));
	if (tmpi->res.type.raw_type != RT_F64 && !(tmpi->ic_flags & ICF_USE_F64))
		tmpi->ic_flags |= ICF_USE_INT;
	*_stack_ptr = stack_ptr;
	*_clobbered_reg_mask = clobbered_reg_mask;
}

U0 OptPass6(CCompCtrl *cc)
{
	CIntermediateCode	*tmpi, *tmpi_next, *tmpil1, *tmpil2, *old_tmpil2;
	I64					 stack_ptr = 0, reg_stack_size, clobbered_reg_mask = REGG_CLOBBERED;
	CParseStack			*ps = cc->ps;

	ps->ptr = 0;
	ps->ptr2 = 0;
	if (Bt(&cc->opts, OPTf_NO_REG_VAR) || cc->flags & CCF_NO_REG_OPT)
		reg_stack_size = 0;
	else
		reg_stack_size = 1;
#assert REGG_STACK_TMP == 1 << 9
	tmpi = cc->coc.coc_head.next;
	old_tmpil2 = NULL;
	tmpil1 = tmpil2 = &cmp.ic_nop;
	while (tmpi->ic_code)
	{
		if (tmpi->ic_code > IC_NOP2)
		{
			if (tmpil1->ic_code > IC_NOP2)
				tmpil2 = tmpil1;
			tmpil1 = tmpi;
			if (tmpi->arg2.type & MDF_STACK)
			{
				if (tmpil2->res.type & MDF_STACK && !(tmpil2->ic_flags & ICF_PUSH_RES))
				{
					if (tmpi->ic_code == IC_ASSIGN && tmpi->ic_flags & ICF_BY_VAL && tmpi->ic_flags & ICF_RES_NOT_USED &&
						tmpil2->ic_code != IC_CALL_END && tmpil2->ic_code != IC_CALL_END2 && tmpil2->ic_code != IC_RAX_SET &&
						!(tmpi->ic_flags & (ICF_ARG2_TO_F64 | ICF_ARG2_TO_INT)) &&
						!(tmpil2->ic_flags & (ICF_RES_TO_F64 | ICF_RES_TO_INT)))
					{
						tmpil2->res.type = tmpi->arg1.type & MDG_MASK + tmpi->arg1_type_pointed_to;
						tmpil2->res.reg = tmpi->arg1.reg;
						tmpil2->res.disp = tmpi->arg1.disp;
						tmpil2->ic_flags = tmpil2->ic_flags & ~(ICF_RES_NOT_USED | ICF_RES_WAS_STACK) |
										   tmpi->ic_flags & ~(ICF_BY_VAL | ICF_ARG1_WAS_STACK | ICF_ARG2_WAS_STACK);
						old_tmpil2 = NULL;
						OptSetNOP1(tmpi);
					}
					else
					{
						tmpi->arg2.type = MDF_REG + tmpi->arg2.type.raw_type;
						tmpi->arg2.reg = REG_RAX;
						tmpi->arg2.disp = 0;
						tmpil2->res.type = MDF_REG + tmpil2->res.type.raw_type;
						tmpil2->res.reg = REG_RAX;
						tmpil2->res.disp = 0;
					}
				}
			}
			else if (tmpi->arg1.type & MDF_STACK && tmpil2->res.type & MDF_STACK && !(tmpil2->ic_flags & ICF_PUSH_RES))
			{
				tmpi->arg1.type = MDF_REG + tmpi->arg1.type.raw_type;
				tmpi->arg1.disp = 0;
				tmpil2->res.type = MDF_REG + tmpil2->res.type.raw_type;
				tmpil2->res.disp = 0;
				if (intermediate_code_table[tmpi->ic_code].arg_count == IS_2_ARG)
				{
					tmpi->arg1.reg = REG_R8;
					tmpil2->res.reg = REG_R8;
				}
				else
				{
					tmpi->arg1.reg = REG_RAX;
					tmpil2->res.reg = REG_RAX;
				}
			}
			if (tmpi->ic_flags & ICF_PUSH_RES)
				tmpi->res.type == MDF_STACK + tmpi->res.type.raw_type;
			if (old_tmpil2 != tmpil2)
			{
				if (tmpil2->ic_code > IC_NOP2)
					OptPass6Lag(cc, ps, tmpil2, &stack_ptr, reg_stack_size, &clobbered_reg_mask);
				old_tmpil2 = tmpil2;
			}
		}
		tmpi_next = tmpi->next;
		if (tmpi->ic_code <= IC_NOP2)
			OptFree(tmpi);
		tmpi = tmpi_next;
	}
	if (ps->ptr > 2)
	{
		"Pass:%d Stack:%08X\n", cc->pass,ps->ptr;
		LexExcept(cc, "Compiler Optimization Error at ");
	}
	if (cc->htc.fun)
	{
		cc->htc.fun->used_reg_mask &= ~REGG_STACK_TMP;
		cc->htc.fun->used_reg_mask |= clobbered_reg_mask;
		cc->htc.fun->clobbered_reg_mask = clobbered_reg_mask;
		if (Bt(&cc->flags, CCf_PASS_TRACE_PRESENT) && Bt(&cc->saved_pass_trace, 6))
		{
			"Used      Reg Mask:%04X\n", cc->htc.fun->used_reg_mask;
			"Clobbered Reg Mask:%04X\n", clobbered_reg_mask;
		}
	}
}