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Re: [PATCH] Improve ifcombine (PR 52005)


here is a new version of the ifcombine patch, which handles Andrew's examples (though only with -O2 for one of them, same_phi_args_p returns false otherwise).

Note that the new patch never calls maybe_fold_or_comparisons, only maybe_fold_and_comparisons. It would be possible to call maybe_fold_or_comparisons, when maybe_fold_and_comparisons fails, but I don't know if there are optimizations that one does and not the other, except for the odd trapping-math case.

Bootstrap and testsuite are fine.

2012-07-26 Marc Glisse <>

	PR tree-optimization/51938
	PR tree-optimization/52005
	* tree-ssa-ifcombine.c (ifcombine_ifandif): New parameters for
	inverted conditions.
	(ifcombine_iforif): Remove, merge code into ifcombine_ifandif.
	(tree_ssa_ifcombine_bb): Update calls to the above. Detect !a&&b
	and !a||b patterns.

gcc/testsuite/ PR tree-optimization/51938 PR tree-optimization/52005 * gcc.dg/tree-ssa/ssa-ifcombine-8.c: New testcase. * gcc.dg/tree-ssa/ssa-ifcombine-9.c: Likewise. * gcc.dg/tree-ssa/ssa-ifcombine-10.c: Likewise. * gcc.dg/tree-ssa/ssa-ifcombine-11.c: Likewise.

Marc Glisse

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