Re: inline-asm/9570: [3.3/3.4 regression] Assember error with -finline-functions with g++-3.3

[Adam Lackorzynski <adam@os.inf.tu-dresden.de>]

The following reply was made to PR inline-asm/9570; it has been noted by GNATS.

From: Adam Lackorzynski <adam@os.inf.tu-dresden.de>
To: jason@gcc.gnu.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
	gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: inline-asm/9570: [3.3/3.4 regression] Assember error with -finline-functions with g++-3.3
Date: Sat, 15 Mar 2003 20:29:27 +0100

 Hi,
 
 On Sat Mar 15, 2003 at 17:24:14 -0000, jason@gcc.gnu.org wrote:
 > Synopsis: [3.3/3.4 regression] Assember error with -finline-functions with g++-3.3
 > 
 > State-Changed-From-To: analyzed->closed
 > State-Changed-By: jason
 > State-Changed-When: Sat Mar 15 17:24:13 2003
 > State-Changed-Why:
 >     This is not a bug.  Your code assumes that the inline assembly
 >     will be emitted after the definition of foo(), but if foo() is
 >     inline (as a result of -finline-functions), it is deferred until
 >     EOF, so the inline assembly is emitted after the definition of i.
 >     i lives in .bss, so you end up trying to emit executable code into
 >     .bss, which doesn't work very well.  You probably want to wrap
 >     that code in .pushsection ".text" and .popsection
 > 
 > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9570
 
 Just a small annotation: I think the problem is the location of the "b"
 definition. If I pull the definition of "b" out of the
 function, the test case compiles. Looking at the asm-code, the place of
 the definition (or whatever it exactly is) of b differs and if it's
 below the inline asm code, it doesn't work.
 
 --- x.c Sat Mar 15 19:56:23 2003
 +++ x2.c        Sat Mar 15 19:56:36 2003
 @@ -1,7 +1,7 @@
  int i = 0;
  
 -void foo() {
    static bool b;
 +void foo() {
    if (! i)
      asm("movl %%esp, %0" : "=r" (i));
  }
 
 
 Adding .pushsection and .popsection around the call does seem to fix it
 as well.
 
 
 
 Thanks,
 Adam
 -- 
 Adam                 adam@os.inf.tu-dresden.de
   Lackorzynski         http://os.inf.tu-dresden.de/~adam/