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From: "mikpe at it dot uu.se" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/52306] ICE in cselib_record_set, at cselib.c:2158 Date: Wed, 06 Feb 2013 23:25:00 -0000 [thread overview] Message-ID: <bug-52306-4-2wCkNwHS2n@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-52306-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52306 --- Comment #17 from Mikael Pettersson <mikpe at it dot uu.se> 2013-02-06 23:23:58 UTC --- Created attachment 29376 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29376 reduced test case Please disregard my last two comments, I misread the insn dump and mistook a note for the invalid concurrent modification of a register. Thorsten's initial xslt test case, attachment 27325, ICEs 4.6 and 4.7 -with -O2 -fPIC, and 4.8 with just -O2. This new test case is substantially reduced from the initial one, but it only ICEs 4.8. The ICE occurs when cselib processes insn 67. IRA produced (insn 67 66 69 10 (set (reg/f:SI 52 [ D.1521 ]) (mem/f:SI (post_inc:SI (reg:SI 59 [ ivtmp.11 ])) [3 MEM[base: 0B, index: ivtmp.11_66, offset: 0B]+0 S4 A16])) pr52306-4.c:44 38 {*movsi_m68k2} (expr_list:REG_INC (reg:SI 59 [ ivtmp.11 ]) (nil))) with, if I read the dump correctly, reg 52 mapped to %a1 and reg 59 spilled. Reload then sees fit to reload reg 59 into %a1, resulting in (insn 67 253 69 10 (set (reg:SI 9 %a1) (mem/f:SI (post_inc:SI (reg:SI 9 %a1)) [3 MEM[base: 0B, index: ivtmp.11_66, offset: 0B]+0 S4 A16])) pr52306-4.c:44 38 {*movsi_m68k2} (expr_list:REG_INC (reg:SI 9 %a1) (nil))) which uses %a1 both as an auto-inc source pointer and as the dest of the load, causing the assertion failure in cselib. The post_inc of reg 59 (%a1) is actually dead, reload added insns to load %a1 from reg 59's spill slot and to increment that memory cell directly. I'm guessing either reload should not have coalesced reg 59 with reg 52 (due to the post_inc on reg 59), or it should have cancelled the post_inc when it added the new insn to increment the spill slot directly.
next prev parent reply other threads:[~2013-02-06 23:25 UTC|newest] Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-02-18 23:32 [Bug middle-end/52306] New: ICE in CSE tg at mirbsd dot org 2012-03-25 12:47 ` [Bug middle-end/52306] " aoliva at gcc dot gnu.org 2012-03-25 13:51 ` aoliva at gcc dot gnu.org 2012-05-06 14:29 ` tg at mirbsd dot org 2012-05-06 17:05 ` tg at mirbsd dot org 2012-12-04 9:27 ` tg at mirbsd dot org 2012-12-04 10:29 ` mikpe at it dot uu.se 2012-12-04 12:59 ` tg at mirbsd dot org 2012-12-04 22:06 ` mikpe at it dot uu.se 2012-12-06 9:50 ` mikpe at it dot uu.se 2012-12-06 9:53 ` jakub at gcc dot gnu.org 2012-12-24 0:53 ` tg at mirbsd dot org 2013-01-29 21:17 ` [Bug middle-end/52306] ICE in cselib_record_set, at cselib.c:2158 tg at mirbsd dot org 2013-01-29 21:26 ` tg at mirbsd dot org 2013-01-29 23:30 ` tg at mirbsd dot org 2013-01-30 17:34 ` mikpe at it dot uu.se 2013-01-30 17:50 ` mikpe at it dot uu.se 2013-02-06 23:25 ` mikpe at it dot uu.se [this message] 2013-02-07 8:14 ` jakub at gcc dot gnu.org 2013-08-17 17:31 ` tg at mirbsd dot org 2013-08-17 18:44 ` tg at mirbsd dot org 2013-08-22 16:28 ` tg at mirbsd dot org 2013-12-19 9:02 ` schwab@linux-m68k.org 2013-12-19 10:40 ` mikpelinux at gmail dot com 2013-12-19 11:12 ` [Bug middle-end/52306] [4.8/4.9 regression] " ebotcazou at gcc dot gnu.org 2013-12-19 11:22 ` schwab@linux-m68k.org 2013-12-19 11:28 ` amker.cheng at gmail dot com 2013-12-19 15:18 ` rguenth at gcc dot gnu.org 2014-02-10 5:37 ` law at redhat dot com 2014-02-10 16:26 ` law at gcc dot gnu.org 2014-02-10 16:26 ` [Bug middle-end/52306] [4.8 " law at redhat dot com 2014-02-19 22:02 ` schwab@linux-m68k.org 2014-02-23 14:21 ` mikpelinux at gmail dot com 2014-05-22 9:07 ` rguenth at gcc dot gnu.org 2014-12-19 13:44 ` jakub at gcc dot gnu.org 2015-01-19 22:34 ` law at redhat dot com
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