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2 Commits

Author SHA1 Message Date
Andrew Trick
ad4b55b3d8 misched: Infrastructure for weak DAG edges. 
This adds support for weak DAG edges to the general scheduling
infrastructure in preparation for MachineScheduler support for
heuristics based on weak edges.

llvm-svn: 167738
 2012-11-12 19:28:57 +00:00
Andrew Trick
1115f0067a sched: fix latency of memory dependence chain edges for consistency. 
For store->load dependencies that may alias, we should always use
TrueMemOrderLatency, which may eventually become a subtarget hook. In
effect, we should guarantee at least TrueMemOrderLatency on at least
one DAG path from a store to a may-alias load.

This should fix the standard mode as well as -enable-aa-sched-mi".

llvm-svn: 158380
 2012-06-13 02:39:03 +00:00