[llvm] [RISCV][VLOPT] Add masked load to isSupported and getOperandInfo (PR #122030)

[Craig Topper via llvm-commits]

topperc wrote:

masked -> mask. "Masked load" would be load with of a vector with some elements masked. "Mask load" loads a memory location containing a mask.

https://github.com/llvm/llvm-project/pull/122030