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From: "rmansfield at qnx dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/46212] Segfault in reg_nonzero_bits_for_combine
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46212

--- Comment #3 from Ryan Mansfield <rmansfield at qnx dot com> 2010-10-28 18:45:10 UTC ---
Reduced testcase:

static __inline__ unsigned foo(void *__ptr) {
   unsigned __val = *(volatile unsigned *)(__ptr);
   return (((__val) >> 24) | (((__val) >> 8) & 0xff00) |  (((__val) & 0xff00)
<< 8) | ((__val) << 24));
}

void bar(void *dst, void *src, int pixels) {
  unsigned c;
  while (pixels--) {
   c = foo(src);
   *(unsigned *)dst = (c & 0xf80000) >> 9 | (c & 0xf800) >> 6 | (c & 0xf8) >> 3
| (c & 0x80000000) >> 16;
  }
}

Looks like the same bug. Sorry for the dup. I only searched bugzilla for PRs
about reg_nonzero_bits_for_combine.