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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/50325] [4.7 Regression] 76 new fails with rev. 177691
Date: Thu, 01 Dec 2011 11:08:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50325

--- Comment #25 from Iain Sandoe <iains at gcc dot gnu.org> 2011-12-01 11:08:28 UTC ---
the following tried using the vendor's gcc-4.2:

typedef struct
{
  unsigned short flda:9;
  float b;
  unsigned int fldc:17;
  float d;
  unsigned long long flde:33;
  float f;
} Struct;

extern float __attribute__((noinline)) foo (Struct s);

int main ()
{
  Struct q = {0x1fd, 1.0F, 0x1fffd, 2.0F, 0x1fffffffdLL, 3.0F};

  /* Is layed out thus xx = space directives:
     0xfe 0x80 xx xx
     0x3F800000
     0xff fe 80 xx
     0x40000000
     ff ff ff fe 80 xx xx xx
     0x40400000

     i.e. all ms aligned...
 */

  /* It is passed in r3..r9 in 32 bit chunks with the same organization as
memory
     - no shuffling at that stage.  */
  return (int) foo (q);
}