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From: "aoliva at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/52306] ICE in CSE Date: Sun, 25 Mar 2012 12:47:00 -0000 [thread overview] Message-ID: <bug-52306-4-0CocEUZmys@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 #1 from Alexandre Oliva <aoliva at gcc dot gnu.org> 2012-03-25 12:00:34 UTC --- The bug, duplicated by compiling attachment 26150, from bug 43437 comment 16, with a cross-compiler to m68k-elf with -O -c, exposes a reload problem. Before reload, we have this insn: (insn 288 287 290 40 (set (reg/f:SI 124 [ D.1788 ]) (mem/f:SI (post_inc:SI (reg:SI 145 [ ivtmp.76 ])) [5 MEM[base: D.1889_285, offset: 0B]+0 S4 A16])) pr52306.c:278 37 {*movsi_m68k2} (expr_list:REG_INC (reg:SI 145 [ ivtmp.76 ]) (nil))) reload turns this into: (insn 639 287 640 40 (set (reg:SI 9 %a1) (mem/c:SI (plus:SI (reg/f:SI 14 %a6) (const_int -44 [0xffffffffffffffd4])) [13 %sfp+-44 S4 A16])) pr5 2306.c:278 36 {*movsi_m68k} (nil)) (insn 640 639 288 40 (set (mem/c:SI (plus:SI (reg/f:SI 14 %a6) (const_int -44 [0xffffffffffffffd4])) [13 %sfp+-44 S4 A16]) (plus:SI (mem/c:SI (plus:SI (reg/f:SI 14 %a6) (const_int -44 [0xffffffffffffffd4])) [13 %sfp+-44 S4 A16]) (const_int 4 [0x4]))) pr52306.c:278 132 {*addsi3_internal} (nil)) (insn 288 640 290 40 (set (reg:SI 9 %a1) (mem/f:SI (post_inc:SI (reg:SI 9 %a1)) [5 MEM[base: D.1889_285, offset: 0B]+0 S4 A16])) pr52306.c:278 37 {*movsi_m68k2} (expr_list:REG_INC (reg:SI 9 %a1) (nil))) reload correctly performs the post_inc in a separate insn, but it fails to remove the post_inc from the MEM that had it, so we end up with two concurrent modifications of the same register, which is not well-formed RTX.
next prev parent reply other threads:[~2012-03-25 12:01 UTC|newest] Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-02-18 23:32 [Bug middle-end/52306] New: " tg at mirbsd dot org 2012-03-25 12:47 ` aoliva at gcc dot gnu.org [this message] 2012-03-25 13:51 ` [Bug middle-end/52306] " 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 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 ` [Bug middle-end/52306] [4.8 " law at redhat dot com 2014-02-10 16:26 ` [Bug middle-end/52306] [4.8/4.9 " law at gcc dot gnu.org 2014-02-19 22:02 ` [Bug middle-end/52306] [4.8 " 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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