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smu10
2011 Apr 15
0
[LLVMdev] Scheduling - WAW Dependencies
...r, again, presumably because
JNE_4's CopyToReg takes care of moving DEC64_32rr's flag output to
EFLAGS.
Now we come to the actual problem. As far as the graph is concerned,
there is nothing preventing us from scheduling SU2 (DEC64_32rr) before
any of the other flag-affecting nodes, such as SU10. One such schedule
is 8-13-12-14-3-11-2-7-10-5-6-9-4-1-0 (which is, incidentally, what my
scheduler produces). However, when we look at the code generated from
such a schedule, we see this:
--------------------------------------------------
.LBB0_1: # %bb...