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Date: Wed, 02 Jun 2004 20:25:00 -0000
From: "peter at the-baradas dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20040602202507.15782.peter@the-baradas.com>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug target/15782] New: m68k_output_mi_thunk emits wrong code for ColdFire
X-Bugzilla-Reason: CC
X-SW-Source: 2004-06/txt/msg00250.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

m68k_output_mi_thunk generats an adjustment of the first parameter on the stack
and calls off to the target function.  This adjustment is done using addq/subq
for values in the range of 1-8, but fo values outside that range, it generates
'add.l #<imm>,4(%sp)' which is valid for m68k, but invalid for ColdFire.  The
suggested fix for ColdFire is to load the value into %d0, and *then* emit 'add.l
%d0,4(%sp)'.

The following code triggers this bug when compiled with:

m68k-elf-g++ -m5307 -O

     class FooA {
     public:
       virtual ~FooA () = 0;
       int data[100];
     };


     class FooB {
     public:
       virtual void foo1 () = 0;
               void fooB () {foo1 ();}
       int data[100];
     };


     class FooC : public FooA, public FooB {
     public:
       virtual void foo1 () {}
     };


     FooC* Test ()
     {
       FooC* foc = new FooC;
       foc->fooB ();
     }

-- 
           Summary: m68k_output_mi_thunk emits wrong code for ColdFire
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: target
        AssignedTo: bernie at develer dot com
        ReportedBy: peter at the-baradas dot com
                CC: gcc-bugs at gcc dot gnu dot org,peter at the-baradas dot
                    com
GCC target triplet: m68k-elf


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15782