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From: "hp at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/18701] [4.0 regression] mmix-knuth-mmixware gcc.c-torture/execute failures: 20010224-1.c, 20020216-1.c, 20040218-1.c, 20040709-2.c
Date: Mon, 20 Dec 2004 01:55:00 -0000 [thread overview]
Message-ID: <20041220015542.14937.qmail@sourceware.org> (raw)
In-Reply-To: <20041128144007.18701.hp@gcc.gnu.org>
------- Additional Comments From hp at gcc dot gnu dot org 2004-12-20 01:55 -------
Combine changes:
(insn 13 12 15 0 (set (reg:HI 273)
(mem:HI (plus:DI (reg/v/f:DI 269 [ y ])
(const_int 2 [0x2])) [3 S2 A16])) 1 {movhi} (nil)
(expr_list:REG_DEAD (reg/v/f:DI 269 [ y ])
(nil)))
(insn 15 13 16 0 (set (reg:DI 275)
(plus:DI (reg:DI 272)
(subreg:DI (reg:HI 273) 0))) 7 {adddi3} (insn_list:REG_DEP_TRUE 12
(insn_list:REG_DEP_TRUE 13 (nil)))
(expr_list:REG_DEAD (reg:DI 272)
(expr_list:REG_DEAD (reg:HI 273)
(nil))))
into:
(insn 15 13 16 0 (set (reg:DI 275)
(plus:DI (reg:DI 272)
(subreg:DI (mem:HI (plus:DI (reg/v/f:DI 269 [ y ])
(const_int 2 [0x2])) [3 S2 A16]) 0))) 7 {adddi3}
(insn_list:REG_DEP_TRUE 12 (nil))
(expr_list:REG_DEAD (reg/v/f:DI 269 [ y ])
(expr_list:REG_DEAD (reg:DI 272)
(nil))))
which is already wrong because the address isn't valid in DImode
(STRICT_ALIGNMENT). Likely a paradoxical subregs issue; they're allowed
if !INSN_SCHEDULING.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18701
next prev parent reply other threads:[~2004-12-20 1:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-28 14:40 [Bug target/18701] New: " hp at gcc dot gnu dot org
2004-11-28 15:08 ` [Bug target/18701] " pinskia at gcc dot gnu dot org
2004-12-02 12:17 ` lerdsuwa at gcc dot gnu dot org
2004-12-19 18:02 ` hp at gcc dot gnu dot org
2004-12-20 0:55 ` steven at gcc dot gnu dot org
2004-12-20 0:59 ` hp at gcc dot gnu dot org
2004-12-20 0:59 ` hp at gcc dot gnu dot org
2004-12-20 1:00 ` hp at bitrange dot com
2004-12-20 1:55 ` hp at gcc dot gnu dot org [this message]
2004-12-20 3:40 ` hp at gcc dot gnu dot org
2004-12-23 18:46 ` hp at gcc dot gnu dot org
2004-12-31 16:25 ` cvs-commit at gcc dot gnu dot org
2004-12-31 16:28 ` cvs-commit at gcc dot gnu dot org
2004-12-31 16:33 ` hp at gcc dot gnu dot org
2005-01-21 2:14 ` cvs-commit at gcc dot gnu dot org
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