[Bug target/83409] arc: "internal compiler error: in extract_constrain_insn" with -O3

[roger at nextmovesoftware dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83409

Roger Sayle  changed:

   What|Removed |Added

 CC||roger at nextmovesoftware dot 
com

--- Comment #3 from Roger Sayle  ---
I'm unable to reproduce this with mainline gcc configured with
--target=arc-elf.  scatterlist.i (and the reduced test case in comment #1),
compile fine with -O2, -O3 and -O3 -fno-strict-aliasing.  I've also tried
-mcpu=em.  Can you confirm that this has been fixed for you (so we can close
the PR)?

[Bug target/83409] arc: "internal compiler error: in extract_constrain_insn" with -O3

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83409

Martin Liška  changed:

   What|Removed |Added

   Keywords|needs-bisection |
 Status|UNCONFIRMED |NEW
   Last reconfirmed||2018-10-09
 Ever confirmed|0   |1

--- Comment #2 from Martin Liška  ---
Looks very old, I see it also with GCC-5 branch.

[Bug target/83409] arc: "internal compiler error: in extract_constrain_insn" with -O3

[arnd at linaro dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83409

Arnd Bergmann  changed:

   What|Removed |Added

   Keywords|needs-reduction |

--- Comment #1 from Arnd Bergmann  ---
Reduced to:

$ arc-elf-gcc-7.2.1  -O2 -c scatterlist.i

struct scatterlist {
  long sg_magic;
  long page_link;
  int offset;
};
int a, b;
int fn2(void);
struct scatterlist g;
void fn1(void) {
  do {
struct scatterlist *c = 
a = 0;
for (; a < b; a++)
  c[a].sg_magic = 1;
if (fn2())
  while (10)
;
  } while (1);
}