[Bug c/35926] New: Pushing / Poping ebx without using it.

2008-04-13 Thread ppelissi at caramail dot com 
The following code produces a push and pop of ebx without using it inside:

typedef struct toto_s *toto_t;
toto_t add (toto_t a, toto_t b) {
  int64_t tmp = (int64_t)(intptr_t)a + ((int64_t)(intptr_t)b~1L);
  return (toto_t)(intptr_t) tmp;
}

Here is the output of the compiler:
gcc version 4.3.0 (GCC) 
COLLECT_GCC_OPTIONS='-v' '-O3' '-S' '-fomit-frame-pointer' '-save-temps'
'-mtune=generic'
 /usr/local/libexec/gcc/i686-pc-linux-gnu/4.3.0/cc1 -E -quiet -v immediate.c
-mtune=generic -fomit-frame-pointer -O3 -fpch-preprocess -o immediate.i
ignoring nonexistent directory
/usr/local/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../i686-pc-linux-gnu/include
#include ... search starts here:
#include ... search starts here:
 /usr/local/include
 /usr/local/lib/gcc/i686-pc-linux-gnu/4.3.0/include
 /usr/local/lib/gcc/i686-pc-linux-gnu/4.3.0/include-fixed
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-O3' '-S' '-fomit-frame-pointer' '-save-temps'
'-mtune=generic'
 /usr/local/libexec/gcc/i686-pc-linux-gnu/4.3.0/cc1 -fpreprocessed immediate.i
-quiet -dumpbase immediate.c -mtune=generic -auxbase immediate -O3 -version
-fomit-frame-pointer -o immediate.s
GNU C (GCC) version 4.3.0 (i686-pc-linux-gnu)
compiled by GNU C version 4.3.0, GMP version 4.2.2, MPFR version 2.3.1.
warning: GMP header version 4.2.2 differs from library version 4.1.4.
GGC heuristics: --param ggc-min-expand=98 --param ggc-min-heapsize=128998
Compiler executable checksum: 6f004a95f08b214d06bfab9d0128e657
COMPILER_PATH=/usr/local/libexec/gcc/i686-pc-linux-gnu/4.3.0/:/usr/local/libexec/gcc/i686-pc-linux-gnu/4.3.0/:/usr/local/libexec/gcc/i686-pc-linux-gnu/:/usr/local/lib/gcc/i686-pc-linux-gnu/4.3.0/:/usr/local/lib/gcc/i686-pc-linux-gnu/
LIBRARY_PATH=/usr/local/lib/gcc/i686-pc-linux-gnu/4.3.0/:/usr/local/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-O3' '-S' '-fomit-frame-pointer' '-save-temps'
'-mtune=generic'
[EMAIL PROTECTED] to-do]$ cat immediate.s 
.file   immediate.c
.text
.p2align 4,,15
.globl add
.type   add, @function
add:
pushl   %ebx
movl12(%esp), %eax
movl8(%esp), %ecx
popl%ebx
andl$-2, %eax
addl%ecx, %eax
ret
.size   add, .-add
.ident  GCC: (GNU) 4.3.0
.section.note.GNU-stack,,@progbits

I can reproduce this problem for GCC 4.1.2 and GCC 4.2.2 too.


-- 
   Summary: Pushing / Poping ebx without using it.
   Product: gcc
   Version: 4.3.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ppelissi at caramail dot com
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35926

[Bug c/35926] Pushing / Poping ebx without using it.

2008-04-13 Thread ppelissi at caramail dot com 


--- Comment #1 from ppelissi at caramail dot com  2008-04-13 17:49 ---
Created an attachment (id=15473)
 -- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15473action=view)
preprocessed sources


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35926

[Bug c/23076] New: GNU C extension / attribute destructor + static : invalid storage class for function

2005-07-26 Thread ppelissi at caramail dot com 
The follwing program:

#include stdio.h
#define LOG
FILE *log_file;

int f2 (int x)
{
#ifdef LOG
  static long toto = 0;
  static const char *fname = __func__;
  static void __attribute__ ((destructor)) f (void)   {
fprintf (log_file, %s: toto=%ld\n, fname, toto);
  }
  toto += x;
#endif
  return 42;
}

int main ()
{
  log_file = fopen (toto.log, w);
  f2 (3);
  return 0;
}

failed to compile with GCC 4.0.0 and GCC 4.0.1:

morpork tmp 69 % /localdisk/gcc-4.0.1/bin/gcc tgcc.c
tgcc.c: In function 'f2':
tgcc.c:12: error: invalid storage class for function 'f'
morpork tmp 68 % /localdisk/gcc-4.0.1/bin/gcc --version
gcc (GCC) 4.0.1
Copyright (C) 2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


whereas it works perfectly with GCC 3.2.x, 3.3.x and GCC 3.4.x.

-- 
   Summary: GNU C extension / attribute destructor + static :
invalid storage class for function
   Product: gcc
   Version: 4.0.1
Status: UNCONFIRMED
  Severity: normal
  Priority: P2
 Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ppelissi at caramail dot com
CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23076

[Bug c/19972] New: Return Local function pointer

2005-02-15 Thread ppelissi at caramail dot com 
When returning local function pointer, it doesn't produce any warnings.
For example:

int *h() {
  int z;
  return z;
}

int (*apply (int (*f) (const void *, const void *), void *a))(const void *)
{
  int zozo(const void * b) { return f(a,b); };
  return zozo;
}

Compile with -O2 -Wall, it produces a warning for h:

ttt.c: In function 'h':
ttt.c:17: warning: function returns address of local variable

But not for `apply' (and it produces invalid code, which is normal).

GCC Version:
Using built-in specs.
Configured with: ../configure --prefix=/global/morpork/gcc-4.0-20050130
Thread model: posix
gcc version 4.0.0 20050130 (experimental)

-- 
   Summary: Return Local function pointer
   Product: gcc
   Version: 4.0.0
Status: UNCONFIRMED
  Severity: enhancement
  Priority: P2
 Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ppelissi at caramail dot com
CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19972