On 05/08/11 02:38, roy rosen wrote:
> Hi,
>
> In my port I have an error: Before ira I have the following insn:
>
> (insn 3859 4277 4366 57 (set (reg:BI 2038)
> (subreg:BI (reg/v:SI 181 [ realsz ]) 3)) 76 {movbi}
> (expr_list:REG_EQUAL (const_int 1 [0x1])
> (nil)))
>
>
> During ira this insn is transformed (I guess because reg 181 is spilled) into:
>
> (insn 5109 5108 4366 57 (set (reg:BI 82 p1 [2038])
> (mem/c:BI (plus:SI (reg/f:SI 79 r31)
> (const_int -353 [0xfffffffffffffe9f])) [26 %sfp+-353
> S1 A8])) 77 {movbi_load}
> (nil))
>
> The problem is that this is an illegal insn since the I don't have an
> insn which loads from memory to P registers so I get error:
> unrecognizable insn.
> I have only insns which load from memory to R register class and insn
> that moves from R to P and I expected that to happen.
>
> I also tried to add to secondary reload things like:
> if (rclass == P_REGS && MEM_P(x))
> return R_REGS;
> or
> if ((rclass == P_REGS) && (((GET_CODE(x) == SUBREG) && MEM_P(XEXP (x,
> 0)))))
> {
> return R_REGS;
> }
> but it does not seem to help.
> Does anyone have any idea what can I do?
Presumably r31 is your frame or stack pointer?
reload will replace a pseudo with its equivalent stack location when the
pseudo fails to get a hard register.
Thus it is often necessary to test reg_equiv_mem (pseudo) to see if a
pseudo might be turned into a mem and thus need a secondary reload.
jeff
