[Bug target/99781] [11 Regression] ICE in partial_subreg_p, at rtl.h:3144
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99781 Jakub Jelinek changed: What|Removed |Added Resolution|--- |FIXED Status|NEW |RESOLVED --- Comment #7 from Jakub Jelinek --- So should be fixed now.
[Bug target/99781] [11 Regression] ICE in partial_subreg_p, at rtl.h:3144
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99781 --- Comment #6 from CVS Commits --- The master branch has been updated by Vladimir Makarov : https://gcc.gnu.org/g:4bbd51afaa4a3c116fb538d912b35e126be80b41 commit r11-8008-g4bbd51afaa4a3c116fb538d912b35e126be80b41 Author: Vladimir N. Makarov Date: Wed Mar 31 13:26:30 2021 -0400 [PR99781] Update correctly reg notes in LRA for multi-registers and set up biggest mode safely The PR is about incorrect use of partial_subreg_p for unordered modes. I found 2 places of dangerous comparing unordered modes in LRA. The patch removes dangerous use of paradoxical_subreg_p and partial_subreg_p in split_reg and process_bb_lives. The both places used them to solve PR77761 long time ago. But the problem was also fixed by later patches too (if there is no hard reg explicitly, it have VOIDmode and we use natural mode to split hard reg live, otherwise we use the biggest explicitly used mode for hard reg splitting). The PR also says about inaccurate update of reg notes in LRA. It happens for reg notes which refer for multi-registers. The patch also fixes this issue. gcc/ChangeLog: PR target/99781 * lra-constraints.c (split_reg): Don't check paradoxical_subreg_p. * lra-lives.c (clear_sparseset_regnos, regnos_in_sparseset_p): New functions. (process_bb_lives): Don't update biggest mode of hard reg for implicit in multi-register group. Use the new functions for updating dead_set and unused_set by register notes. gcc/testsuite/ChangeLog: PR target/99781 * g++.target/aarch64/sve/pr99781.C: New.
[Bug target/99781] [11 Regression] ICE in partial_subreg_p, at rtl.h:3144
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99781 --- Comment #5 from Vladimir Makarov --- I've reproduced it too and started to work on it. I hope the fix will be ready this week.
[Bug target/99781] [11 Regression] ICE in partial_subreg_p, at rtl.h:3144
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99781 rsandifo at gcc dot gnu.org changed: What|Removed |Added Ever confirmed|0 |1 Last reconfirmed||2021-03-30 Status|UNCONFIRMED |NEW --- Comment #4 from rsandifo at gcc dot gnu.org --- Confirmed. The REG_NOTE itself is easy to fix (I have a patch), but then we run into similar problems because of the (correct-looking) code added for PR77761. Not sure what the best way out of this is.
[Bug target/99781] [11 Regression] ICE in partial_subreg_p, at rtl.h:3144
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99781 Jakub Jelinek changed: What|Removed |Added CC||rsandifo at gcc dot gnu.org, ||vmakarov at gcc dot gnu.org --- Comment #3 from Jakub Jelinek --- Seems in *.ira dump the v1 (33) register is only used in OImode, so reg->biggest_mode being E_OImode makes sense. But for some reason LRA has added (expr_list:REG_DEAD (reg:VNx8BF 33 v1) and the code is unhappy to see partial_subreg_p called for unordered modes.
[Bug target/99781] [11 Regression] ICE in partial_subreg_p, at rtl.h:3144
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99781 --- Comment #2 from Arseny Solokha --- (In reply to Jakub Jelinek from comment #1) > ICEs since r8-6032-g43cacb12fc859b671464b63668794158974b2a34 when SVE > support has been added, so doesn't look like a regression to me, as before > that it would not accept that option: > invalid feature modifier in ‘-march=armv8-a+sve’ I can remove the regression marker, but I cannot change the PR priority.
[Bug target/99781] [11 Regression] ICE in partial_subreg_p, at rtl.h:3144
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99781 Jakub Jelinek changed: What|Removed |Added CC||jakub at gcc dot gnu.org --- Comment #1 from Jakub Jelinek --- ICEs since r8-6032-g43cacb12fc859b671464b63668794158974b2a34 when SVE support has been added, so doesn't look like a regression to me, as before that it would not accept that option: invalid feature modifier in ‘-march=armv8-a+sve’
[Bug target/99781] [11 Regression] ICE in partial_subreg_p, at rtl.h:3144
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99781 Richard Biener changed: What|Removed |Added Target Milestone|--- |11.0 Priority|P3 |P1
