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Re: Help with RTL expand and a builtins
On 07/18/2017 04:49 PM, Segher Boessenkool wrote:
On Tue, Jul 18, 2017 at 12:49:06PM +0200, Martin Liška wrote:
Solved, tail call was responsible for dead RTL instructions.
This seems similar to https://gcc.gnu.org/ml/gcc-patches/2017-07/msg00362.html
then. Is it?
There are many cases where we generated dead code during expand on
purpose (some just laziness, some to avoid code complications).
Because of this it is hard to detect where we generate dead code that
is just plain wrong (should not be dead). And such things aren't
trivial to debug :-(
Yep, exactly. It was really hard to debug! I tried many different approaches how to
generate sequence of RTL instructions and nothing :) Maybe writing to a dump_file
that RTL insns are eliminated will be handy?