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

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116166
--- Comment #18 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 58847
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58847&action=edit
reduced testcase

Reduced testcase that reproduces the issue on x86_64 with --param
logical-op-non-short-circuit=0

A release checking GCC 13 takes 38s and shows

 dominator optimization             :  37.47 ( 98%)   0.01 (  9%)  37.50 ( 98%)
 1959k (  6%)

GCC 14 is worse:

 dominator optimization             :  76.10 ( 99%)   0.01 (  8%)  76.13 ( 99%)
 1958k (  6%)

GCC 15 (with checking):

 dominator optimization             : 126.05 ( 99%)   0.04 ( 31%) 126.08 ( 98%)
 1958k (  6%)