https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101373
--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:fedcf3c476aff7533741a1c61071200f0a38cf83 commit r12-2254-gfedcf3c476aff7533741a1c61071200f0a38cf83 Author: Richard Biener <rguent...@suse.de> Date: Thu Jul 8 09:52:49 2021 +0200 tree-optimization/101373 - avoid PRE across externally throwing call PRE already tries to avoid hoisting possibly trapping expressions across calls that might not return normally but fails to consider const calls that throw externally. The following fixes that and also plugs the hole of trapping references not pruned in case they are not catched by the actuall call clobbering it. At -Os we hit the same issue in RTL PRE and postreload-gcse has even more incomplete checks so the patch adjusts both of those as well. 2021-07-08 Richard Biener <rguent...@suse.de> PR tree-optimization/101373 * tree-ssa-pre.c (prune_clobbered_mems): Also prune trapping references when the BB may not return. (compute_avail): Pass in the function we're working on and replace cfun references with it. Externally throwing const calls also possibly terminate the function. (pass_pre::execute): Pass down the function we're working on. * gcse.c (compute_hash_table_work): Externally throwing const/pure calls also need record_last_mem_set_info. * postreload-gcse.c (record_opr_changes): Looping or externally throwing const/pure calls also need record_last_mem_set_info. * g++.dg/torture/pr101373.C: New testcase, XFAILed. * gnat.dg/opt95.adb: Likewise.
