Eric Fisher wrote:
> I think it's very interesting. I want to split a insn of loading SF
> data through SI symbol, such as (set (reg:SF 5 $5) (mem/u/f:SF
> (symbol_ref/u:SI ("*$LC0")))).
> I want to it firstly load the address into a register, then load the
> data through the register. So I define the insn as follows,
> (define_insn "loadsf"
> [(set (match_operand:SF 0 "register_operand" "=r")
> (mem:SF (match_operand:SI 1 "immediate_operand" "m")))]
> ""
> {
> operands[1] = force_reg (SImode, operands[1]);
> return md_output_move (operands[0], operands[1]);
> }
> [(set_attr "type" "load")
> (set_attr "mode" "SF")
> (set_attr "length" "*")])
>
> But the gcc will come out such error,
> internal compiler error: in gen_reg_rtx, at emit-rtl.c:819.
>
> Which is the codes as following at emit-rtl.c:819,
> /* Don't let anything called after initial flow analysis create new
> registers. */
> if (no_new_pseudos)
> abort ();
>
> Why can't I create a new register?
Read about reload and no_new_pseudos in the docs for `movm'
http://gcc.gnu.org/onlinedocs/gccint/Standard-Names.html
>So how should I do to implement it?
Generate it earlier:
http://gcc.gnu.org/onlinedocs/gccint/Expander-Definitions.html#Expander-Defi
nitions
cheers,
DaveK
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