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From: "kkojima at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/13250] [SH] Gcc code for rotation clobbers the register, but gcc continues to use the register as if it was not clobbered
Date: Thu, 27 May 2004 17:31:00 -0000 [thread overview]
Message-ID: <20040527031907.18441.qmail@sourceware.org> (raw)
In-Reply-To: <20031201014925.13250.uwe@netbsd.org>
------- Additional Comments From kkojima at gcc dot gnu dot org 2004-05-27 03:19 -------
This looks an SH target specific problem when generating rtl for rotation
like (e << 8) | (e >> 24). It seems the patch below for sh.md fixes this.
I'll propose it to gcc-patch list after bootstrap and regtest.
--- ORIG/gcc/gcc/config/sh/sh.md 2004-05-14 10:08:34.000000000 +0900
+++ LOCAL/gcc/gcc/config/sh/sh.md 2004-05-27 08:32:37.000000000 +0900
@@ -2194,7 +2194,7 @@
parts[0] = gen_reg_rtx (SImode);
parts[1] = gen_reg_rtx (SImode);
emit_insn (gen_rotlsi3_16 (parts[2-choice], operands[1]));
- parts[choice-1] = operands[1];
+ emit_move_insn (parts[choice-1], operands[1]);
emit_insn (gen_ashlsi3 (parts[0], parts[0], GEN_INT (8)));
emit_insn (gen_lshrsi3 (parts[1], parts[1], GEN_INT (8)));
emit_insn (gen_iorsi3 (operands[0], parts[0], parts[1]));
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |kkojima at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
Component|rtl-optimization |target
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13250
next prev parent reply other threads:[~2004-05-27 3:19 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-01 1:49 [Bug optimization/13250] New: " uwe at netbsd dot org
2003-12-01 1:50 ` [Bug optimization/13250] " uwe at netbsd dot org
2003-12-01 1:55 ` pinskia at gcc dot gnu dot org
2004-01-21 4:03 ` dhazeghi at yahoo dot com
2004-05-27 17:31 ` kkojima at gcc dot gnu dot org [this message]
2004-05-28 16:05 ` [Bug target/13250] " uwe at ptc dot spbu dot ru
2004-05-28 20:17 ` kkojima at gcc dot gnu dot org
2004-05-28 21:04 ` cvs-commit at gcc dot gnu dot org
2004-05-28 22:18 ` [Bug target/13250] [3.4 only] " pinskia at gcc dot gnu dot org
2004-06-01 0:08 ` cvs-commit at gcc dot gnu dot org
2004-06-01 0:13 ` pinskia at gcc dot gnu dot org
2004-07-26 0:48 ` cvs-commit at gcc dot gnu dot org
2004-07-26 0:52 ` pinskia at gcc dot gnu dot org
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