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From: "amodra at bigpond dot net dot au" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/15289] reload error with big-endian subregs
Date: Wed, 05 May 2004 14:24:00 -0000 [thread overview]
Message-ID: <20040505142422.32571.qmail@sources.redhat.com> (raw)
In-Reply-To: <20040505053304.15289.amodra@bigpond.net.au>
------- Additional Comments From amodra at bigpond dot net dot au 2004-05-05 14:24 -------
This:
(insn 16 15 17 0 (set (reg:SI 9 9 [129])
(zero_extend:SI (subreg:QI (reg:SI 0 0 [128]) 2))) 18 {*rs6000.md:508}
(insn_list 13 (nil))
(nil))
gets turned into
(insn 64 15 16 0 (set (reg:QI 10 10)
(reg:QI 0 0)) -1 (nil)
(nil))
(insn 16 64 17 0 (set (reg:SI 9 9 [129])
(zero_extend:SI (reg:QI 10 10))) 18 {*rs6000.md:508} (insn_list 13 (nil))
(nil))
Jan, http://gcc.gnu.org/ml/gcc-patches/2003-04/msg00882.html added the code to
reload that made a reload necessary for (subreg:QI (reg:SI 0 0 [128]) 2) with
the hunk
*************** find_reloads (insn, replace, ind_levels,
*** 2869,2874 ****
--- 2876,2887 ----
if (GET_CODE (SUBREG_REG (operand)) == REG
&& REGNO (SUBREG_REG (operand)) < FIRST_PSEUDO_REGISTER)
{
+ if (!subreg_offset_representable_p
+ (REGNO (SUBREG_REG (operand)),
+ GET_MODE (SUBREG_REG (operand)),
+ SUBREG_BYTE (operand),
+ GET_MODE (operand)))
+ force_reload = 1;
offset += subreg_regno_offset (REGNO (SUBREG_REG (operand)),
GET_MODE (SUBREG_REG (operand)),
SUBREG_BYTE (operand),
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15289
next prev parent reply other threads:[~2004-05-05 14:24 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-05 5:33 [Bug target/15289] New: " amodra at bigpond dot net dot au
2004-05-05 6:30 ` [Bug target/15289] " pinskia at gcc dot gnu dot org
2004-05-05 14:24 ` amodra at bigpond dot net dot au [this message]
2004-05-27 21:47 ` [Bug rtl-optimization/15289] reload error with non-lowpart subregs amodra at bigpond dot net dot au
2004-06-16 22:03 ` [Bug rtl-optimization/15289] [3.4/3.5 Regression] " pinskia at gcc dot gnu dot org
2004-08-19 20:53 ` mmitchel at gcc dot gnu dot org
2004-08-26 12:19 ` hubicka at gcc dot gnu dot org
2004-08-29 19:02 ` mmitchel at gcc dot gnu dot org
2004-10-31 2:08 ` [Bug rtl-optimization/15289] [3.4/4.0 " mmitchel at gcc dot gnu dot org
2004-11-28 13:08 ` steven at gcc dot gnu dot org
2004-11-28 13:27 ` amodra at bigpond dot net dot au
2004-11-28 17:54 ` giovannibajo at libero dot it
2004-11-29 21:25 ` rth at gcc dot gnu dot org
2004-12-01 18:14 ` cvs-commit at gcc dot gnu dot org
2004-12-01 18:16 ` cvs-commit at gcc dot gnu dot org
2004-12-02 19:16 ` cvs-commit at gcc dot gnu dot org
2004-12-03 23:26 ` rth at gcc dot gnu dot org
2004-12-05 5:21 ` cvs-commit at gcc dot gnu dot org
2004-12-05 5:22 ` rth at gcc dot gnu dot org
2004-12-05 5:38 ` pinskia at gcc dot gnu dot org
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