https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115883
--- Comment #6 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Hans-Peter Nilsson <h...@gcc.gnu.org>: https://gcc.gnu.org/g:5031df5d1f4954304c618efd2de029edc6b3699f commit r15-3204-g5031df5d1f4954304c618efd2de029edc6b3699f Author: Hans-Peter Nilsson <h...@axis.com> Date: Mon Jul 8 03:55:27 2024 +0200 combine.cc (make_more_copies): Copy attributes from the original pseudo, PR115883 The first of the late-combine passes, propagates some of the copies made during the (in-time-)combine pass in make_more_copies into the users of the "original" pseudo registers and removes the "old" pseudos. That effectively removes attributes such as REG_POINTER, which matter to LRA. The quoted PR is for an ICE-manifesting bug that was exposed by the late-combine pass and went back to hiding with this patch until commit r15-2937-g3673b7054ec2, the fix for PR116236, when it was actually fixed. To wit, this patch is only incidentally related to that bug. In other words, the REG_POINTER attribute should not be required for LRA to work correctly. This patch merely corrects state for those propagated register-uses to ante late-combine. For reasons not investigated, this fixes a failing test "FAIL: gcc.dg/guality/pr54200.c -Og -DPREVENT_OPTIMIZATION line 20 z == 3" for x86_64-linux-gnu. PR middle-end/115883 * combine.cc (make_more_copies): Copy attributes from the original pseudo to the new copy.
