[xla] Modify the p2p-schedule-preparation pass to support a new scheme to #63635
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…e to pipeline Send-Recv chains. The old pipeline scheme only peels off a Recv and rotates the remaining Recv-done, Send, Send-done inside a while loop. The new pipeline scheme peels off both the Recv and the Send and rotates the remaining Recv-done and Send-done inside a while loop. The new pipeline scheme can also pipeline two Send-Recv groups that form a cycle. In this case, we peel off all four Recv and Send instructions, and rotate the remaining four Recv-done and Send-done instructions. Modify existing tests to use the new pipeline scheme. Add a test for pipelining two Send-Recv groups that form a cycle. PiperOrigin-RevId: 616325546
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[xla] Modify the p2p-schedule-preparation pass to support a new scheme to
pipeline Send-Recv chains.
The old pipeline scheme only peels off a Recv and rotates the remaining
Recv-done, Send, Send-done inside a while loop.
The new pipeline scheme peels off both the Recv and the Send and rotates
the remaining Recv-done and Send-done inside a while loop.
The new pipeline scheme can also pipeline two Send-Recv groups that form a
cycle. In this case, we peel off all four Recv and Send instructions, and
rotate the remaining four Recv-done and Send-done instructions.
Modify existing tests to use the new pipeline scheme. Add a test for pipelining
two Send-Recv groups that form a cycle.