[Bug rtl-optimization/81288] [5/6/7/8 Regression] ICE on 32-bit BE powerpc targets -w -misel -O2 (-O3, -Ofast, -Os)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81288

Jakub Jelinek  changed:

   What|Removed |Added

   Target Milestone|5.5 |6.5

--- Comment #2 from Jakub Jelinek  ---
GCC 5 branch is being closed

[Bug rtl-optimization/81288] [5/6/7/8 Regression] ICE on 32-bit BE powerpc targets -w -misel -O2 (-O3, -Ofast, -Os)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81288

Richard Biener  changed:

   What|Removed |Added

   Priority|P3  |P2

[Bug rtl-optimization/81288] [5/6/7/8 Regression] ICE on 32-bit BE powerpc targets -w -misel -O2 (-O3, -Ofast, -Os)

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81288

Segher Boessenkool  changed:

   What|Removed |Added

 Status|UNCONFIRMED |NEW
   Last reconfirmed||2017-07-10
 Ever confirmed|0   |1

--- Comment #1 from Segher Boessenkool  ---
It doesn't fail for me, -misel, either -m32 or -m64, either -O2, -Os, -O3,
not with trunk and also not with four weeks ago.

Ah.  With -mcpu=8548 it segfaults.

It is some unbounded recursion:

#62 0x1118bd14 in fold_rtx (x=0x3fffb6bf2130, insn=insn@entry=0x0)
at /home/segher/src/gcc/gcc/cse.c:3411

Joy, corrupted stack.  "x" seems to be some isel (no surprise really),
probably this one (because it's the only isel in the whole program):

(insn 22 21 23 5 (set (reg:SI 137)
(if_then_else:SI (eq (reg:CC 138)
(const_int 0 [0]))
(const_int 0 [0])
(reg:SI 139))) "81288.c":8 330 {isel_signed_si}
 (nil))

Anyway, confirmed.

[Bug rtl-optimization/81288] [5/6/7/8 Regression] ICE on 32-bit BE powerpc targets -w -misel -O2 (-O3, -Ofast, -Os)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81288

Richard Biener  changed:

   What|Removed |Added

   Target Milestone|--- |5.5