[Bug rtl-optimization/56903] [4.8/4.9 Regression] gcc is 4.8.0 fails to compile netdev.c from the linux kernel [internal compiler error: Maximum number of LRA constraint passes is achieved]

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56903



--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-04-10 
12:02:27 UTC ---

Slightly cleaned up testcase:

/* PR rtl-optimization/56903 */

/* { dg-do compile } */

/* { dg-options "-Os" } */

/* { dg-additional-options "-march=pentium3" { target ia32 } } */



int a, *b, c;

struct S { int s : 1; } *fn1 (void);

extern int fn3 (void), fn4 (int *);



void

fn2 (void)

{

  int e = fn3 ();

  char f = c + fn1 ()->s * 4;

  if (*b && f == e)

    a = *b;

  fn4 (b);

}