[Bug tree-optimization/116166] risc-v (last) insn-emit-nn.c build takes hours

[mark at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116166

--- Comment #12 from Mark Wielaard <mark at gcc dot gnu.org> ---
(In reply to Andreas Schwab from comment #11)
> You can add target-specific flags like this:
> 
> $(INSNEMIT_SEQ_O): ALL_COMPILERFLAGS += -fno-tree-dominator-opts

Thanks. With "$(GIMPLE_MATCH_PD_SEQ_O) $(INSNEMIT_SEQ_O) insn-opinit.o
insn-recog.o: ALL_COMPILERFLAGS += -O1 -fno-tree-dominator-opts" a make -j64
drops from 8 hours to 3.5 hours:

real    202m25.031s
user    2209m7.176s
sys     108m49.102s

Now insn-recog.cc (even though it is included in the workaround) takes the
longest time (~1 hour) to compile.