[llvm] [RISCV][VLOPT] Add vfirst and vcpop to getOperandInfo (PR #122295)

[Michael Maitland via llvm-commits]

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@@ -488,6 +488,10 @@ getOperandLog2EEW(const MachineOperand &MO, const MachineRegisterInfo *MRI) {
   case RISCV::VFCVT_F_X_V:
   // Vector Floating-Point Merge Instruction
   case RISCV::VFMERGE_VFM:
+  // Vector count population in mask vcpop.m
+  // vfirst find-first-set mask bit
+  case RISCV::VCPOP_M:
+  case RISCV::VFIRST_M:
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michaelmaitland wrote:

>  Or is it the case that the MILog2SEW is guaranteed to be zero in this case?

That is correct. And since the source operand may not be vmv0, we need to handle it here.

https://github.com/llvm/llvm-project/pull/122295