From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 22956 invoked by alias); 19 Sep 2013 13:38:10 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 22935 invoked by uid 48); 19 Sep 2013 13:38:07 -0000 From: "chrbr at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/58475] SH4 insn swapb does not satisfy its constraints: Date: Thu, 19 Sep 2013 13:38:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: 4.8.1 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: chrbr at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2013-09/txt/msg01416.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58475 --- Comment #1 from chrbr at gcc dot gnu.org --- The problem is that [(set (match_operand:SI 0 "arith_reg_dest" "=r") (ior:SI (and:SI (match_operand:SI 1 "arith_reg_operand" "r") accepts fpul registers in the predicate, but not in the constraints. The reason is that arith_reg_dest is tricked to accept FPUL_REG when TARGET_SH4. There is no reason that a fpul register is accepted as a source operand for an arithmetic op, unless the floating point transfer needs to be expressed in the rtl, so fpul will need reloading. .