Hi,
I'm trying to port GCC to a simple processor (used only for academic
purposes, yet).
Problem: no immediate-values are supported in the instructions.
How can I tell the compiler to put all immediates into the memory, and
use the corresponding reference instead of the value itself?
so, instead of
move REG,5
I would like to have
move REG,const5
…
; and somewhere else
const5: .word 5
My approach would be, to use a define_expand statement like this:
(define_expand "movhi"
[(set (match_operand:HI 0 "general_operand" "")
(match_operand:HI 1 "general_operand" ""))]
""
"
{
/* we are not able to use immediates, so put them to memory */
if (CONST_INT_P (operands[1]))
operands[1] = force_const_to_memref (HImode, operands[1]);
}")
But HOW can I force the operand into memory?
I.e. "force_const_to_memref" needs to be defined somehow.
Any hints?
Thanks a lot!
Hagen
