https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82975
--- Comment #6 from ktkachov at gcc dot gnu.org --- Author: ktkachov Date: Tue Dec 19 16:58:22 2017 New Revision: 255830 URL: https://gcc.gnu.org/viewcvs?rev=255830&root=gcc&view=rev Log: [arm] PR target/82975: Guard against reg_renumber being NULL in arm.h In this bug we ICE when checking REGNO_OK_FOR_INDEX_P on arm during pre-IRA scheduling. This is because REGNO_OK_FOR_INDEX_P ends up checking the reg_renumber array. Before IRA reg_renumber is NULL and thus we segfault. The fix is to guard the use of reg_renumber in the logic in TEST_REGNO in arm.h. On aarch64, for example, we also guard against the reg_renumber == NULL case. This fixes the ICE. I also remove the part of the comment that muses on when reg_renumber is available as with this patch it should now be safe to use at any point. Bootstrapped and tested on arm-none-linux-gnueabihf. PR target/82975 * config/arm/arm.h (TEST_REGNO): Check reg_renumber is set before accessing it. Adjust comment. * gcc.dg/pr82975.c: New test. Added: trunk/gcc/testsuite/gcc.dg/pr82975.c Modified: trunk/gcc/ChangeLog trunk/gcc/config/arm/arm.h trunk/gcc/testsuite/ChangeLog
