[Bug regression/59923] [4.9 Regression] ICE in maybe_record_trace_start, at dwarf2cfi.c:2239 with -mcpu=cortex-a15 -mthumb -O2 -fvisibility=hidden -g

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59923

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 31982
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31982&action=edit
gcc49-pr59923.patch

This isn't a dup of PR59575, here the problem is that ce3 pass creates
cond_exec insn to restore an unwind info important register and adjust stack
pointer.
dwarf2 EH info can't express conditional restore and expressing conditional CFA
adjustment would be quite ugly there.

Untested fix attached, can anyone with an ARM box bootstrap/regtest it?