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Add register rename optimisation to dynarec to eliminate some redundant

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UOP_MOVs.
This commit is contained in:
SarahW 2020-09-14 20:46:56 +01:00
commit 0d7103368a
3 changed files with 77 additions and 24 deletions
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69
src/codegen_ir.c
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@ -107,37 +107,52 @@ void codegen_ir_compile(ir_data_t *ir, codeblock_t *block)
if ((uop->type & UOP_MASK) == UOP_INVALID)
continue;
if (uop->type & UOP_TYPE_PARAMS_REGS)
{
codegen_reg_alloc_register(uop->dest_reg_a, uop->src_reg_a, uop->src_reg_b, uop->src_reg_c);
if (uop->src_reg_a.reg != IREG_INVALID)
{
uop->src_reg_a_real = codegen_reg_alloc_read_reg(block, uop->src_reg_a, NULL);
}
if (uop->src_reg_b.reg != IREG_INVALID)
{
uop->src_reg_b_real = codegen_reg_alloc_read_reg(block, uop->src_reg_b, NULL);
}
if (uop->src_reg_c.reg != IREG_INVALID)
{
uop->src_reg_c_real = codegen_reg_alloc_read_reg(block, uop->src_reg_c, NULL);
}
}
if (uop->type & UOP_TYPE_ORDER_BARRIER)
codegen_reg_flush(ir, block);
if (uop->type & UOP_TYPE_PARAMS_REGS)
if ((uop->type & UOP_MASK) == (UOP_MOV & UOP_MASK) && reg_version[IREG_GET_REG(uop->src_reg_a.reg)][uop->src_reg_a.version].refcount <= 1 &&
reg_is_native_size(uop->src_reg_a) && reg_is_native_size(uop->dest_reg_a))
{
if (uop->dest_reg_a.reg != IREG_INVALID)
{
uop->dest_reg_a_real = codegen_reg_alloc_write_reg(block, uop->dest_reg_a);
}
/*Special case for UOP_MOV - if source register won't be used again then
just rename it to dest register instead of moving*/
codegen_reg_alloc_register(invalid_ir_reg, uop->src_reg_a, invalid_ir_reg, invalid_ir_reg);
uop->src_reg_a_real = codegen_reg_alloc_read_reg(block, uop->src_reg_a, NULL);
codegen_reg_rename(block, uop->src_reg_a, uop->dest_reg_a);
if (uop->type & UOP_TYPE_ORDER_BARRIER)
codegen_reg_flush(ir, block);
}
else
{
if (uop->type & UOP_TYPE_PARAMS_REGS)
{
codegen_reg_alloc_register(uop->dest_reg_a, uop->src_reg_a, uop->src_reg_b, uop->src_reg_c);
if (uop->src_reg_a.reg != IREG_INVALID)
{
uop->src_reg_a_real = codegen_reg_alloc_read_reg(block, uop->src_reg_a, NULL);
}
if (uop->src_reg_b.reg != IREG_INVALID)
{
uop->src_reg_b_real = codegen_reg_alloc_read_reg(block, uop->src_reg_b, NULL);
}
if (uop->src_reg_c.reg != IREG_INVALID)
{
uop->src_reg_c_real = codegen_reg_alloc_read_reg(block, uop->src_reg_c, NULL);
}
}
if (uop->type & UOP_TYPE_ORDER_BARRIER)
codegen_reg_flush(ir, block);
if (uop->type & UOP_TYPE_PARAMS_REGS)
{
if (uop->dest_reg_a.reg != IREG_INVALID)
{
uop->dest_reg_a_real = codegen_reg_alloc_write_reg(block, uop->dest_reg_a);
}
}
if (!uop_handlers[uop->type & UOP_MASK])
fatal("!uop_handlers[uop->type & UOP_MASK] %08x\n", uop->type);
uop_handlers[uop->type & UOP_MASK](block, uop);
if (!uop_handlers[uop->type & UOP_MASK])
fatal("!uop_handlers[uop->type & UOP_MASK] %08x\n", uop->type);
uop_handlers[uop->type & UOP_MASK](block, uop);
}
if (uop->type & UOP_TYPE_JUMP)
{