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The following testcase shows a missed optimization that then leads to wrong-code when issueing SMed stores on exits. When we were able to compute an ordered sequence of stores for an exit we need to emit that in the correct order and we can emit it disregarding to any conditional for whether a store actually happened (we know it did). We can also improve detection as of whether we need conditional processing at all. Both parts fix the testcase. 2020-05-18 Richard Biener <rguenther@suse.de> PR tree-optimization/95172 * tree-ssa-loop-im.c (execute_sm): Get flag whether we eventually need the conditional processing. (execute_sm_exit): When processing an orderd sequence avoid doing any conditional processing. (hoist_memory_references): Pass down whether all edges have ordered processing for a ref to execute_sm. * gcc.dg/torture/pr95172.c: New testcase.
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