[Bug rtl-optimization/63281] powerpc64le creates 64 bit constants from scratch instead of loading them

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63281

--- Comment #22 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> ---
On power10, loading constant only needs 1 instruction, like:
pld 9,.LC0@pcrel

And, as tests, it seems nearly as fast as using 1 instruction to build const.