https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54052
--- Comment #17 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-12 branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:1edc6a71feeb8460fbd4938b8926b5692fbab43f commit r12-10552-g1edc6a71feeb8460fbd4938b8926b5692fbab43f Author: Richard Biener <rguent...@suse.de> Date: Mon Feb 19 11:10:50 2024 +0100 rtl-optimization/54052 - RTL SSA PHI insertion compile-time hog The following tries to address the PHI insertion compile-time hog in RTL fwprop observed with the PR54052 testcase where the loop computing the "unfiltered" set of variables possibly needing PHI nodes for each block exhibits quadratic compile-time and memory-use. It does so by pruning the local DEFs with LR_OUT of the block, removing regs that can never be LR_IN (defined by this block) in the dominance frontier. PR rtl-optimization/54052 * rtl-ssa/blocks.cc (function_info::place_phis): Filter local defs by LR_OUT. (cherry picked from commit c7151283dc747769d4ac4f216d8f519bda2569b5)
