https://llvm.org/bugs/show_bug.cgi?id=30870
Bug ID: 30870
Summary: We need fewer tools for scheduling post ra scheduler
pass
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: ameh...@ca.ibm.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
I am aware of the following mechanisms for scheduling post ra schedulers.
1- The new virtual function in this patch
2- targetSchedulesPostRAScheduling
3- enablePostRA method in the subtarget
4- PostRAScheduler flag in include/llvm/Target/TargetSchedule.td
5- command line option to turn on new scheduler instead of old one.
6- command line option to turn off post ra schedulers
7- SubstitutePass to use new scheduler instead of old one.
Each of these seems to have a slightly different usecase. If there is a
likelihood that we can remove some of these, it might be worthwhile to open a
PR. otherwise we can leave it as is.
This is taken from D25482 (towards the end of conversation). I add some follow
up comments from there in the comments of this PR
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