From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 3438 invoked by alias); 10 Nov 2012 02:54:16 -0000 Received: (qmail 3412 invoked by uid 48); 10 Nov 2012 02:53:56 -0000 From: "hjl.tools at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/55259] New: plus_constant doesn't handle zero-extended address properly Date: Sat, 10 Nov 2012 02:54:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: hjl.tools at gmail dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 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 X-SW-Source: 2012-11/txt/msg00892.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55259 Bug #: 55259 Summary: plus_constant doesn't handle zero-extended address properly Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end AssignedTo: unassigned@gcc.gnu.org ReportedBy: hjl.tools@gmail.com For address, #0 plus_constant (mode=SImode, x=0x7ffff0fadf40, c=8) at /export/gnu/import/git/gcc/gcc/explow.c:211 #1 0x00000000006f9b04 in adjust_address_1 (memref=0x7ffff0fff2e8, mode=DImode, offset=8, validate=1, adjust_address=1, adjust_object=0) at /export/gnu/import/git/gcc/gcc/emit-rtl.c:2113 #2 0x0000000000cdd259 in split_double_mode (mode=TImode, operands=0x7fffffffd828, num=0, lo_half=0x7fffffffd8f0, hi_half=0x7fffffffd8f8) at /export/gnu/import/git/gcc/gcc/config/i386/i386.c:14721 #3 0x0000000000ceafe7 in ix86_split_to_parts (operand=0x7ffff0fff2e8, parts=0x7fffffffd8f0, mode=TImode) at /export/gnu/import/git/gcc/gcc/config/i386/i386.c:20695 #4 0x0000000000ceb4ad in ix86_split_long_move ( operands=0x17a5fa0 ) at /export/gnu/import/git/gcc/gcc/config/i386/i386.c:20794 Breakpoint 2, plus_constant (mode=DImode, x=0x7ffff0fadf30, c=8) at /export/gnu/import/git/gcc/gcc/explow.c:96 96 zero_extend_mode = GET_MODE (x); (gdb) call debug_rtx (x) (zero_extend:DI (reg:SI 0 ax [82])) (gdb) it should generate (gdb) call debug_rtx (x) (zero_extend:DI (plus:SI (reg:SI 0 ax [82]) (const_int 8 [0x8]))) (gdb) Instead, plus_constant generates (gdb) call debug_rtx (addr) (plus:DI (zero_extend:DI (reg:SI 0 ax [82])) (const_int 8 [0x8]))