Hello all,
I have a question on the peephole2 optimizer.
- My target has a "load double" instruction:
- It does an indexed load of a 64-bit operand to two 32-bit registers.
- The requirement is that the registers are adjacant
(Ri and Ri+1), and that the offset for the second load is 4 byte more
than for the first load.
- I can not find a way to describe this in gcc. I tried
"load_multiple", and this is OK, but gcc only calls that for stack
pushing.
I tried the vector facility, but this does not work either.
- I tried to write a peephole2 optimizer, and this works out OK, it
manages to recognize the sequence, ... but the peephole2 optimizer is
run AFTER register allocation, and the optimization needs to be done
BEFORE, as there are constraints on the 2 registers, Ri and Ri+1.
Any suggestions ?. Is there any way to run peephole2 BEFORE register
allocation ?.
Best Regards,
Henri.
