On 12/7/2021 10:54 PM, Xionghu Luo via Gcc-patches wrote:
r12-4526 cancelled jump thread path rotates loop. It exposes a issue in profile-estimate when predict_extra_loop_exits, outer loop's exit edge is marked as inner loop's extra loop exit and set with incorrect prediction, then a hot inner loop will become cold loop finally through optimizations, this patch add loop check when searching extra exit edges to avoid unexpected predict_edge from predict_paths_for_bb. Regression tested on P8LE, OK for master? gcc/ChangeLog: PR middle-end/103270 * predict.c (predict_extra_loop_exits): Add loop parameter. (predict_loops): Call with loop argument. gcc/testsuite/ChangeLog: PR middle-end/103270 * gcc.dg/pr103270.c: New test.
OK jeff