[Bug rtl-optimization/104914] [MIPS] wrong comparison with scrabbled int value

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104914

--- Comment #23 from YunQiang Su <syq at gcc dot gnu.org> ---
I guess, we should drop TRULY_NOOP_TRUNCATION_MODES_P and
TARGET_MODE_REP_EXTENDED for MIPS. In fact, it will only effect MIPS64 SI->DI.

Then it may reduce the maintain workload for MIPS64.

Let's have a try and run some benchmark.