https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63281
--- Comment #19 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> --- (In reply to Segher Boessenkool from comment #18) Thanks for your clarify! > Yes, it is slow. Five sequential dependent integer instructions instead of > one load instruction. Depending on how you benchmark this you possibly won't Yes, it depends on how the cases are benchmarked. There are some factors that affect the runtime. This is really the point! In the above cases, a few std(s) and there is one spill on r31 are all affect the runtime and would hide the instructions on const building. Focusing on the sequence to build a const, the 5 insns sequence is faster a lot than the sequence of 1 insns.
