https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98144
--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-9 branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:4595028e7212d6870e9e236f1f5a016b50708b7c commit r9-9508-g4595028e7212d6870e9e236f1f5a016b50708b7c Author: Richard Biener <rguent...@suse.de> Date: Fri Jan 29 10:23:40 2021 +0100 rtl-optimization/98144 - tame REE memory usage This changes the REE dataflow to change the explicit all-ones starting solution to be implicit via a visited flag, removing the need to initially start with fully populated bitmaps for all basic-blocks. That reduces peak memory use when compiling the RTL checking enabled insn-extract.c testcase from PR98144 from 6GB to less than 2GB. 2021-01-29 Richard Biener <rguent...@suse.de> PR rtl-optimization/98144 * df.h (df_mir_bb_info): Add con_visited member. * df-problems.c (df_mir_alloc): Initialize con_visited, do not fully populate IN and OUT. (df_mir_reset): Likewise. (df_mir_confluence_0): Set con_visited. (df_mir_confluence_n): Properly handle implicitely fully populated IN and OUT as designated by con_visited and update con_visited accordingly. (cherry picked from commit a8c455bafdefdab0a7b8cdbcdb116c0086bae05e)
