From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-301437-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 8956 invoked by alias); 7 Dec 2009 14:42:27 -0000
Received: (qmail 8889 invoked by uid 48); 7 Dec 2009 14:42:13 -0000
Date: Mon, 07 Dec 2009 14:42:00 -0000
Message-ID: <20091207144213.8888.qmail@sourceware.org>
X-Bugzilla-Reason: CC
References: <bug-42321-14457@http.gcc.gnu.org/bugzilla/>
Subject: [Bug inline-asm/42321] NEON/VFP registers from inline assembly clobber list are saved/restored incorrectly
In-Reply-To: <bug-42321-14457@http.gcc.gnu.org/bugzilla/>
Reply-To: gcc-bugzilla@gcc.gnu.org
To: gcc-bugs@gcc.gnu.org
From: "siarhei dot siamashka at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2009-12/txt/msg00682.txt.bz2



------- Comment #1 from siarhei dot siamashka at gmail dot com  2009-12-07 14:42 -------
Modifying the program to list q-registers in the clobber list provides even
more interesting results:
/************************/
void f()
{
    asm volatile("veor d8, d8, d8" : : :"q4","q5","q7");
}
/************************/

$ gcc -c -mcpu=cortex-a8 -mfpu=neon -mfloat-abi=softfp -O2 test.c
$ objdump -d test.o

00000000 <f>:
   0:   ed2d8b02        vpush   {d8}
   4:   ed2dab02        vpush   {d10}
   8:   ed2deb02        vpush   {d14}
   c:   f3088118        veor    d8, d8, d8
  10:   ecbd8b02        vpop    {d8}
  14:   ecbdab02        vpop    {d10}
  18:   ecbdeb02        vpop    {d14}
  1c:   e12fff1e        bx      lr

Now in addition to the mismatched save/restore order, only lower halves of
q-registers get saved.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42321