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From: Andrew Pinski <>
Subject: Re: optimization/10877: [3.3/3.4 regression] miscompilation with -O3 -fPIC on x86
Date: Tue, 20 May 2003 02:06:00 -0000	[thread overview]
Message-ID: <> (raw)

The following reply was made to PR optimization/10877; it has been noted by GNATS.

From: Andrew Pinski <>
Cc: Andrew Pinski <>
Subject: Re: optimization/10877: [3.3/3.4 regression] miscompilation with -O3 -fPIC on x86
Date: Mon, 19 May 2003 21:58:26 -0400

 It does not fail for me though on i686-pc-linux-gnu with GCC: 3.4  
 20030517 (experimental).
 Or on i686-unkown-openbsd3.1 with gcc version 3.4 20030519  
 tin:~/src/gnu/gcc>g++ -O3 -fPIC ../gcctest/
 tin:~/src/gnu/gcc>more ../gcctest/
      int* i;
      int& get_x() {
        return *i;
      int main() {
        int j;
        i = &j;
 Andrew Pinski
 PS here is the asm from a working version:
          .file   ""
 .globl i
          .align 4
          .type   i, @object
          .size   i, 4
          .zero   4
          .align 2
          .p2align 4,,15
 .globl _Z5get_xv
          .type   _Z5get_xv, @function
          addl    $_GLOBAL_OFFSET_TABLE_, %eax
          pushl   %ebp
          movl    i@GOT(%eax), %edx
          movl    %esp, %ebp
          popl    %ebp
          movl    (%edx), %eax
          .size   _Z5get_xv, .-_Z5get_xv
          .align 2
          .p2align 4,,15
 .globl main
          .type   main, @function
          pushl   %ebp
          movl    %esp, %ebp
          leal    -8(%ebp), %eax
          pushl   %ebx
          subl    $4, %esp
          andl    $-16, %esp
          call    __i686.get_pc_thunk.bx
          addl    $_GLOBAL_OFFSET_TABLE_, %ebx
          movl    i@GOT(%ebx), %ecx
          movl    %eax, (%ecx)
          call    _Z5get_xv@PLT
          movl    -4(%ebp), %ebx
          xorl    %eax, %eax
          .size   main, .-main
          .section ,"ax",@progbits
          .type, @function
          movl    (%esp), %eax
 .globl __i686.get_pc_thunk.bx
          .hidden __i686.get_pc_thunk.bx
          .type   __i686.get_pc_thunk.bx, @function
          movl    (%esp), %ebx
          .ident  "GCC: (GNU) 3.4 20030517 (experimental)" 

             reply	other threads:[~2003-05-20  2:06 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-05-20  2:06 Andrew Pinski [this message]
  -- strict thread matches above, loose matches on Subject: below --
2003-05-21 12:46 Christian Ehrhardt
2003-05-21 11:28 Christian Ehrhardt
2003-05-21  8:46 Christian Ehrhardt
2003-05-20 22:46 Janis Johnson
2003-05-20 19:36 Andrew Pinski
2003-05-20 19:27 Andrew Pinski
2003-05-20 19:16 Wolfgang Bangerth
2003-05-20 17:16 Andrew Pinski
2003-05-20 17:06 Wolfgang Bangerth
2003-05-20 17:06 Christian Ehrhardt
2003-05-20 16:16 Wolfgang Bangerth
2003-05-20 13:56 Wolfgang Bangerth
2003-05-20  1:16 bangerth

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