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

Jeff Law law@redhat.com
Thu Aug 11 22:32:00 GMT 2016


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



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