Hello,
I am a little confused by the code in sched-deps.c.
1. what is the purpose of the reg_note and ds_t? I see the function dk_to_ds,
and the comment in sched-int.h, "Dependence on instruction can be of multiple
types
(e.g. true and output). This fields enhance REG_NOTE_KIND information of the
dependence.". What is enhanced from REG_DEP_TRUE to DEP_TRUE?
in struct _dep, I only find the dependence that is related with REG_NOTE (or
registers). Even ds_t only as DEP_TRUE/DEP_OUTPUT/DEP_ANTI. Does this mean that
gcc doesn't differentiate reg dependence and memory dependence?
Where can I find information about memory dependences such as a write and read
on elementa[100] ? Sometimes meory dependence should be handled differenly with
reg dependece in CG, such as the latency between the producer and the consumer.
2. What different purpose are haifa_note_mem_dep and haifa_note_dep for?
thanks
