Re: Init df for split pass since some target use REG_NOTE in split pattern

[Jeff Law]

On 08/09/2016 08:44 PM, Kito Cheng wrote:
Hi Steven:
You are right, I have build arm toolchain today, it's crash when building libgcc
since there is no valid CFG in split_all_insns_noflow.

Hi Jeff:

Maybe we need split_reg_dead_p and split_reg_unused_p like peephole2
have peep2_reg_dead_p?
Seems pretty reasonable.

I'm still curious which of the 4 passes of split_all_insns was 
triggering the failure though,


jeff