What deliberately has no direct equivalent

Do not hunt indefinitely for single-instruction matches to these x86 features:

• implicit flags and condition-code consumers;
• general memory operands on arithmetic instructions;
• push and pop;
• loop and jrcxz-style specialised branches;
• rep string operations;
• multi-component effective addresses in a load/store;
• variable-length prefix-driven instruction variants;
• a hardware-maintained return address on the ordinary stack.

Some optional RISC-V extensions add higher-level operations, but the base translation is usually a short, explicit sequence.