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Hoists both computations and invariant loads.
The cfgloop.c part is only necessary until we deal with making forwarder
blocks.
Bootstrapped on x86.
Performs roughly 2800 hoists during a gcc bootstrap in it's current placement (if you move it to right after into-ssa, it performs 3800 something hoists, but it's likely just hoisting dead code).
I also fixed a small bug in invoke.texi (we claimed ftree-dominator-opts
"performed Dead Code Elimination on trees".
? tree-loop-fwdsubst.c ? tree-loop-interchange.c
Do you have an updated version which I could play around with? Also I see that you started on loop interchanging, I might be able to have time to help to finish it (I did this loop optimization with the C and C++ trees with only for loops but it worked).
Thanks, Andrew Pinski
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