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Re: [PATCH] Enhance ifcombine to recover non short circuit branches

On 10/27/13 12:55, Andrew Pinski wrote:
Here is my latest patch which adds the testcases from Zhenqiang's
patch and fixes item 1 and 2.

OK?  Bootstrapped and tested on x86_64-linux-gnu with no regressions.

Andrew Pinski

* tree-ssa-ifcombine.c: Include rtl.h and tm_p.h.
(ifcombine_ifandif): Handle cases where
maybe_fold_and_comparisons fails, combining the branches
(tree_ssa_ifcombine): Inverse the order of
the basic block walk, increases the number of combinings.
* gimple.h (gsi_start_nondebug_after_labels_bb): New function.


* gcc.dg/tree-ssa/ssa-ifcombine-ccmp-1.c: New test case.
* gcc.dg/tree-ssa/ssa-ifcombine-ccmp-2.c: New test case.
* gcc.dg/tree-ssa/ssa-ifcombine-ccmp-3.c: New test case.
* gcc.dg/tree-ssa/ssa-ifcombine-ccmp-4.c: New test case.
* gcc.dg/tree-ssa/ssa-ifcombine-ccmp-5.c: New test case.
* gcc.dg/tree-ssa/ssa-ifcombine-ccmp-6.c: New test case.

* gcc.dg/tree-ssa/phi-opt-9.c: Use a function call to prevent
conditional move to be used.
* gcc.dg/tree-ssa/ssa-dom-thread-3.c: Remove check for "one or more
I don't be able to look at this in any depth tonight. However, I would ask that you pass along the dump file for ssa-dom-thread-3.c so that I can evaluate the correctness of your change better.


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