On Tue, Oct 23, 2012 at 5:17 AM, Bin.Cheng wrote:
> Thanks for your explanation.
> Now I understand how df_insn_info is updated when
> deleting/modifying/creating insn. One more question is when and how
> IN/OUT information is updated. GCC calls df_set_bb_dirty when handling
> insns, but I did not
On Mon, Oct 22, 2012 at 6:25 PM, Steven Bosscher wrote:
> Bin.Cheng wrote:
>> It is possible to have register pressure decreased when hoisting an
>> expression up in flow graph because of shrunk live range of input
>> register operands.
>> To accurately simulating the change of register pressure,
Bin.Cheng wrote:
> It is possible to have register pressure decreased when hoisting an
> expression up in flow graph because of shrunk live range of input
> register operands.
> To accurately simulating the change of register pressure, I have to
> check the change of live range of input operands du
