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2011 Apr 15
0
[LLVMdev] Scheduling - WAW Dependencies
...39;m assuming that this is because
they are not hardcoded to output to EFLAGS, but rather to a virtual
register, and the aforementioned CopyToReg node takes the virtual
output from DEC64_32rr and puts it in EFLAGS.
The SelectionDAG is then converted to the following ScheduleDAG:
http://i.imgur.com/S1uWQ.png
Here we can see that the JNE_4 and its CopyToReg neighbor are merged
into a single SUnit and are linked to DEC64_32rr with a data
dependency and to TokenFactor with an order dependency. There's still
no indication that TokenFactor or any of the nodes above it may
overwrite the flags create...