[Bug middle-end/52074] ICE: RTL flag check: MEM_VOLATILE_P used with unexpected rtx code 'plus' in extract_fixed_bit_field, at expmed.c:1734

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52074

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-02-01 
11:47:00 UTC ---
C testcase (-m64 -O2):
struct S { const char *d, *e; } __attribute__((packed));

void
foo (const char **p, struct S *q)
{
  *p = "abcdef";
  q->d = "ghijk";
}

I'd say the bug is in the section anchor support (and the bug goes away with
-O2 -fno-section-anchors; so I'd expect this is a regression since
-fsection-anchors has been introduced and made default on ppc64), because
expand_normal on ADDR_EXPR of the STRING_CST returns a PLUS (which IMHO should
be ok only for EXPAND_SUM etc. but not EXPAND_NORMAL).