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Rework self modifying code handling.

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Code blocks now have a varying level of granularity in the page and dirty masks.
Most blocks have 64-byte granularity, but blocks that are repeatedly modified
drop to 1-byte granularity. This reduces the maximum size of the affected block
significantly, but reduces recompilation due to data located too close to code.

If the block is still marked as dirty, then it is recompiled without any
immediate instruction parameters being baked into the recompiled code, instead
being fetched from the RAM array as needed. This severely reduces recompilation
rates on some SMC-heavy games, eg Duke Nukem 3D, System Shock, Screamer etc,
giving a major speedup.
This commit is contained in:
SarahW 2019-03-16 14:53:26 +00:00
commit ab124776a0
36 changed files with 1719 additions and 233 deletions
Download patch file Download diff file Expand all files Collapse all files

93
src/codegen.c
View file

@ -11,6 +11,7 @@
#include "codegen_backend.h"
#include "codegen_ir.h"
#include "codegen_ops.h"
#include "codegen_ops_helpers.h"
int has_ea;
@ -85,6 +86,7 @@ void codegen_check_seg_write(codeblock_t *block, ir_data_t *ir, x86seg *seg)
static x86seg *codegen_generate_ea_16_long(ir_data_t *ir, x86seg *op_ea_seg, uint32_t fetchdat, int op_ssegs, uint32_t *op_pc)
{
uint32_t old_pc = *op_pc;
// pclog("codegen - mod=%i rm=%i reg=%i fetchdat=%08x\n", cpu_mod, cpu_rm, cpu_reg, fetchdat);
if (!cpu_mod && cpu_rm == 6)
{
@ -145,12 +147,16 @@ static x86seg *codegen_generate_ea_16_long(ir_data_t *ir, x86seg *op_ea_seg, uin
}
}
codegen_mark_code_present(ir->block, cs+old_pc, (*op_pc)-old_pc);
return op_ea_seg;
}
static x86seg *codegen_generate_ea_32_long(ir_data_t *ir, x86seg *op_ea_seg, uint32_t fetchdat, int op_ssegs, uint32_t *op_pc, int stack_offset)
{
codeblock_t *block = ir->block;
uint32_t old_pc = (*op_pc) + 1;
uint32_t new_eaaddr;
int extra_bytes = 0;
if (cpu_rm == 4)
{
@ -162,13 +168,23 @@ static x86seg *codegen_generate_ea_32_long(ir_data_t *ir, x86seg *op_ea_seg, uin
case 0:
if ((sib & 7) == 5)
{
new_eaaddr = fastreadl(cs + (*op_pc) + 1);
uop_MOV_IMM(ir, IREG_eaaddr, new_eaaddr);
if (block->flags & CODEBLOCK_NO_IMMEDIATES)
{
LOAD_IMMEDIATE_FROM_RAM_32(block, ir, IREG_eaaddr, cs + (*op_pc) + 1);
extra_bytes = 1;
}
else
{
new_eaaddr = fastreadl(cs + (*op_pc) + 1);
uop_MOV_IMM(ir, IREG_eaaddr, new_eaaddr);
extra_bytes = 5;
}
(*op_pc) += 4;
}
else
{
uop_MOV(ir, IREG_eaaddr, sib & 7);
extra_bytes = 1;
}
break;
case 1:
@ -176,12 +192,22 @@ static x86seg *codegen_generate_ea_32_long(ir_data_t *ir, x86seg *op_ea_seg, uin
uop_MOV_IMM(ir, IREG_eaaddr, new_eaaddr);
uop_ADD(ir, IREG_eaaddr, IREG_eaaddr, sib & 7);
(*op_pc)++;
extra_bytes = 2;
break;
case 2:
new_eaaddr = fastreadl(cs + (*op_pc) + 1);
uop_MOV_IMM(ir, IREG_eaaddr, new_eaaddr);
uop_ADD(ir, IREG_eaaddr, IREG_eaaddr, sib & 7);
if (block->flags & CODEBLOCK_NO_IMMEDIATES)
{
LOAD_IMMEDIATE_FROM_RAM_32(block, ir, IREG_eaaddr, cs + (*op_pc) + 1);
extra_bytes = 1;
}
else
{
new_eaaddr = fastreadl(cs + (*op_pc) + 1);
uop_MOV_IMM(ir, IREG_eaaddr, new_eaaddr);
extra_bytes = 5;
}
(*op_pc) += 4;
uop_ADD(ir, IREG_eaaddr, IREG_eaaddr, sib & 7);
break;
}
if (stack_offset && (sib & 7) == 4 && (cpu_mod || (sib & 7) != 5)) /*ESP*/
@ -215,29 +241,54 @@ static x86seg *codegen_generate_ea_32_long(ir_data_t *ir, x86seg *op_ea_seg, uin
{
if (!cpu_mod && cpu_rm == 5)
{
new_eaaddr = fastreadl(cs + (*op_pc) + 1);
uop_MOV_IMM(ir, IREG_eaaddr, new_eaaddr);
(*op_pc) += 4;
return op_ea_seg;
}
uop_MOV(ir, IREG_eaaddr, cpu_rm);
if (cpu_mod)
{
if (cpu_rm == 5 && !op_ssegs)
op_ea_seg = &cpu_state.seg_ss;
if (cpu_mod == 1)
if (block->flags & CODEBLOCK_NO_IMMEDIATES)
{
uop_ADD_IMM(ir, IREG_eaaddr, IREG_eaaddr, (uint32_t)(int8_t)(fetchdat >> 8));
(*op_pc)++;
LOAD_IMMEDIATE_FROM_RAM_32(block, ir, IREG_eaaddr, cs + (*op_pc) + 1);
}
else
{
new_eaaddr = fastreadl(cs + (*op_pc) + 1);
uop_ADD_IMM(ir, IREG_eaaddr, IREG_eaaddr, new_eaaddr);
(*op_pc) += 4;
uop_MOV_IMM(ir, IREG_eaaddr, new_eaaddr);
extra_bytes = 4;
}
(*op_pc) += 4;
}
else
{
uop_MOV(ir, IREG_eaaddr, cpu_rm);
if (cpu_mod)
{
if (cpu_rm == 5 && !op_ssegs)
op_ea_seg = &cpu_state.seg_ss;
if (cpu_mod == 1)
{
uop_ADD_IMM(ir, IREG_eaaddr, IREG_eaaddr, (uint32_t)(int8_t)(fetchdat >> 8));
(*op_pc)++;
extra_bytes = 1;
}
else
{
if (block->flags & CODEBLOCK_NO_IMMEDIATES)
{
LOAD_IMMEDIATE_FROM_RAM_32(block, ir, IREG_temp0, cs + (*op_pc) + 1);
uop_ADD(ir, IREG_eaaddr, IREG_eaaddr, IREG_temp0);
}
else
{
new_eaaddr = fastreadl(cs + (*op_pc) + 1);
uop_ADD_IMM(ir, IREG_eaaddr, IREG_eaaddr, new_eaaddr);
extra_bytes = 4;
}
(*op_pc) += 4;
}
}
}
}
if (extra_bytes)
codegen_mark_code_present(ir->block, cs+old_pc, extra_bytes);
return op_ea_seg;
}
@ -583,6 +634,7 @@ generate_call:
opcode_mask = 0xff;
}
}
codegen_mark_code_present(block, cs+old_pc, (op_pc - old_pc) - pc_off);
// pclog("%04x:%08x : %02x\n", CS, new_pc, opcode);
if (recomp_op_table && recomp_op_table[(opcode | op_32) & recomp_opcode_mask])
{
@ -654,6 +706,7 @@ generate_call:
uop_MOV_IMM(ir, IREG_ssegs, op_ssegs);
uop_LOAD_FUNC_ARG_IMM(ir, 0, fetchdat);
uop_CALL_INSTRUCTION_FUNC(ir, op);
codegen_mark_code_present(block, cs+cpu_state.pc, 8);
last_op_32 = op_32;
last_op_ea_seg = op_ea_seg;