Hello all,
For the 16 bit target that i am currently porting can have only
positive offsets less than 0x100. (unsigned 8 bit) for offset
addressing mode.
During reload i am getting ICE because the address created is not
legitimate. So i guess i have to define the macro
LEGITIMIZE_RELOAD_ADDRESS.
But i am not sure how to do this?
With this will i be able to convert
load Rd, Rb[offset]
into
li Rs, offset
add Rs,Rb
load Rd, Rs
where Rs is a reserved register.
Or the only way is to do this like the other targets say in rs6000
>From rs6000_legitimize_reload_address()
/* Reload the high part into a base reg; leave the low part
in the mem directly. */
x = gen_rtx_PLUS (GET_MODE (x),
gen_rtx_PLUS (GET_MODE (x), XEXP (x, 0),
GEN_INT (high)),
GEN_INT (low));
push_reload (XEXP (x, 0), NULL_RTX, &XEXP (x, 0), NULL,
BASE_REG_CLASS, GET_MODE (x), VOIDmode, 0, 0,
opnum, (enum reload_type)type);
*win = 1;
return x;
I guess this will generate something like
add Rs, Rb, excess_offset
load Rd, Rs[legitimate_offset];
Regards,
Shafi
