Top-down list schedulers do not support physreg dependencies

[asl]

Bugzilla Link	4273
Resolution	DUPLICATE
Resolved on	May 27, 2009 01:34
Version	trunk
OS	All
CC	@sunfishcode

Extended Description

Currently when scheduling for latency (and thus - via topdown list schedulers) I need to always flag comparison to conditional branch since it's impossible to reuse the status register due to lack of physreg dependencies.

This is quite unfortunate and yields ugly code :(

I think one can easily reproduce the problem with x86 backend codegen'ing something like select_cc / br_cc and changing default (pre-RA) scheduler to list-td

[asl]

*** This bug has been marked as a duplicate of bug #2716 ***