[Bug c/71889] New: [5.4 Regression] [MIPS] python: "insn does not satisfy its constraints"

[kabel at blackhole dot sk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71889

            Bug ID: 71889
           Summary: [5.4 Regression] [MIPS] python: "insn does not satisfy
                    its constraints"
           Product: gcc
           Version: 5.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kabel at blackhole dot sk
  Target Milestone: ---

Created attachment 38909
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38909&action=edit
_codecs_cn.preprocessed.c

Compiling Python-2.7.11/Modules/cjkcodecs/_codecs_cn.c with gcc-5.4.0 on MIPS
with -O2 results in "insn does not satisfy its constraints" error (full in
attachment).

When instead of -O2 I try all the -f flags that are specified by manpage to be
implied by -O2 (and -O1), compilation is successful - I thus think that there
are some more -f options implied (which are not in the manpage) or there is
some other error.

I am 98% sure that this was an error in 5.3.0 as well.

Attached preprocessed _codecs_cn.c and also commands used for both
compilations.