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Add dynarec optimisation for UOP_MOV_IMM, to avoid register allocation

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if the destination register won't be immediately used again.
This commit is contained in:
SarahW 2020-09-16 20:47:12 +01:00
commit 25fe224ea9
12 changed files with 216 additions and 1 deletions
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10
src/codegen_ir.c
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@ -107,7 +107,15 @@ void codegen_ir_compile(ir_data_t *ir, codeblock_t *block)
if ((uop->type & UOP_MASK) == UOP_INVALID)
continue;
#ifdef CODEGEN_BACKEND_HAS_MOV_IMM
if ((uop->type & UOP_MASK) == (UOP_MOV_IMM & UOP_MASK) && reg_is_native_size(uop->dest_reg_a) && !codegen_reg_is_loaded(uop->dest_reg_a) && reg_version[IREG_GET_REG(uop->dest_reg_a.reg)][uop->dest_reg_a.version].refcount <= 0)
{
/*Special case for UOP_MOV_IMM - if destination not already in host register
and won't be used again then just store directly to memory*/
codegen_reg_write_imm(block, uop->dest_reg_a, uop->imm_data);
}
else
#endif
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))
{