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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/58744] Illegal Memory Access on 3-byte packed struct ARCH: x86_64
Date: Wed, 23 Oct 2013 11:49:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58744

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
             Target|                            |x86_64-*-*
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-10-23
          Component|c                           |target
     Ever confirmed|0                           |1
      Known to fail|                            |4.9.0

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  On i?86 we properly do a 16byte and a 8byte access (but we copy to
stack anyway).

typedef struct{
    unsigned char B;
    unsigned char G;
    unsigned char R;
} __attribute__((packed)) pixel ;

void apply_filter(pixel p);

void color_filter_c(pixel *src)
{
  apply_filter(*src);
}