76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
#include <stdint.h>
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#include <86box/86box.h>
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#include "cpu.h"
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#include <86box/mem.h>
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#include "x86.h"
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#include "386_common.h"
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#include "codegen.h"
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#include "codegen_ir.h"
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#include "codegen_ir_defs.h"
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#include "codegen_reg.h"
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#include "codegen_ops_helpers.h"
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void LOAD_IMMEDIATE_FROM_RAM_16_unaligned(codeblock_t *block, ir_data_t *ir, int dest_reg, uint32_t addr)
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{
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/*Word access that crosses two pages. Perform reads from both pages, shift and combine*/
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uop_MOVZX_REG_PTR_8(ir, IREG_temp3_W, get_ram_ptr(addr));
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uop_MOVZX_REG_PTR_8(ir, dest_reg, get_ram_ptr(addr+1));
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uop_SHL_IMM(ir, IREG_temp3_W, IREG_temp3_W, 8);
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uop_OR(ir, dest_reg, dest_reg, IREG_temp3_W);
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}
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void LOAD_IMMEDIATE_FROM_RAM_32_unaligned(codeblock_t *block, ir_data_t *ir, int dest_reg, uint32_t addr)
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{
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/*Dword access that crosses two pages. Perform reads from both pages, shift and combine*/
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uop_MOV_REG_PTR(ir, dest_reg, get_ram_ptr(addr & ~3));
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uop_MOV_REG_PTR(ir, IREG_temp3, get_ram_ptr((addr + 4) & ~3));
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uop_SHR_IMM(ir, dest_reg, dest_reg, (addr & 3) * 8);
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uop_SHL_IMM(ir, IREG_temp3, IREG_temp3, (4 - (addr & 3)) * 8);
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uop_OR(ir, dest_reg, dest_reg, IREG_temp3);
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}
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#define UNROLL_MAX_REG_REFERENCES 200
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#define UNROLL_MAX_UOPS 1000
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#define UNROLL_MAX_COUNT 10
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int codegen_can_unroll_full(codeblock_t *block, ir_data_t *ir, uint32_t next_pc, uint32_t dest_addr)
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{
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int start;
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int max_unroll;
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int first_instruction;
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int TOP = -1;
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/*Check that dest instruction was actually compiled into block*/
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start = codegen_get_instruction_uop(block, dest_addr, &first_instruction, &TOP);
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/*Couldn't find any uOPs corresponding to the destination instruction*/
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if (start == -1)
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{
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/*Is instruction jumping to itself?*/
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if (dest_addr != cpu_state.oldpc)
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{
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return 0;
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}
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else
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{
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start = ir->wr_pos;
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TOP = cpu_state.TOP;
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}
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}
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if (TOP != cpu_state.TOP)
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return 0;
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max_unroll = UNROLL_MAX_UOPS / ((ir->wr_pos-start)+6);
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if ((max_version_refcount != 0) && (max_unroll > (UNROLL_MAX_REG_REFERENCES / max_version_refcount)))
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max_unroll = (UNROLL_MAX_REG_REFERENCES / max_version_refcount);
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if (max_unroll > UNROLL_MAX_COUNT)
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max_unroll = UNROLL_MAX_COUNT;
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if (max_unroll <= 1)
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return 0;
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codegen_ir_set_unroll(max_unroll, start, first_instruction);
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return 1;
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}
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