https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54052
--- Comment #16 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-13 branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:d629308c699bb8fe90c2afeb7fa1acb12cb5526b commit r13-8763-gd629308c699bb8fe90c2afeb7fa1acb12cb5526b 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)
