... arm64-cpu-detect -I../../third_party/libaom/source/libaom -march=armv8.2-a+dotprod+i8mm -fno-delete-null-pointer-checks -fno-ident -fno ....

ADD (immediate) 将Xn 与imm 相加，结果赋值给Xd，imm 是无符号数，范围为0 - 4095。 shift 是对imm 进行移位，shift 为0 的时候，表示左移.. Application Program Status Register (APSR). The N , Z , C , V flags (just like in AArch64).. An AArch64 state R-profile feature is enabled by default or optional depending on whether the feature is enabled by default or optional in the Armv8.4-A ....

i8mm, simd, Enable the Int8 Matrix Multiply extension. ite, Enable the TRCIT instruction.

jscvt, fp, Enable the fjcvtzs JavaScript conversion instruction. lor ....