https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104914
--- Comment #20 from YunQiang Su <syq at gcc dot gnu.org> ---
This patch has 2 problems:
1. We may need some more steps to add
gcc_assert (outprec < inprec)
Now, I met some ICE with it.
2. It doesn't solve the this problem:
In combine.cc, jump_insn eats truncate and sign_extend.
In fact that is the real problem: How to tell combine.cc:
don't eat it; this truncate/sign_extend is really needed by us.
