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The testcase shows that we fail to clear gimple_call_ctrl_altering_p when the last abnormal edge goes away, causing an edge insert to a loop header edge when we have preheaders to split the edge unnecessarily. The following addresses this by more aggressively clearing the flag in cleanup_call_ctrl_altering_flag. 2020-09-04 Richard Biener <rguenther@suse.de> PR tree-optimization/96931 * tree-cfgcleanup.c (cleanup_call_ctrl_altering_flag): If there's a fallthru edge and no abnormal edge the call is no longer control-altering. (cleanup_control_flow_bb): Pass down the BB to cleanup_call_ctrl_altering_flag. * gcc.dg/pr96931.c: New testcase.
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