[Bug rtl-optimization/60763] [4.9 Regression] ICE in extract_insn starting with rev 208984

[dje at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60763

--- Comment #10 from David Edelsohn <dje at gcc dot gnu.org> ---
I'm not questioning the analysis, I'm questioning the solution. Directly
generating a register and jamming in the REGNO in this pattern seems sort of
crude.

gen_rtx_REG (DImode, REGNO (op0));

I don't doubt that this is the RTL that eventually is produced, I am surprised
that there is no existing wrapper function in simplify-rtx.c or rtlanal.c that
can be used.

If this is the necessary implementation, I think it deserves some, brief
comment.