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With python -m asmjit "vfmadd213sd {src:double:x}, {src:double:x}, {srcdst:double:x}" -vvv, you can see that the first instruction in throughput mode has multiple different input registers, even though they could be combined to a single register.

Tested on different hardware platforms, running asmbench (as stated in the --help example) without a comma in between the operands, e.g., add {src:i32:r} {srcdst:i32:r}, leads to following error message:

$ asmbench -l 4 "vaddsd {src:double:x} {src:double:x} {dst:double:x}"
python: /root/miniconda2/conda-bld/llvmdev_1559156562364/work/include/llvm/Support/Casting.h:255: typename llvm::cast_retty<X, Y*>::ret_type llvm::cast(Y*) [with X = llvm::MCTargetExpr; Y = const llvm::MCExpr; typename llvm::cast_retty<X, Y*>::ret_type = const llvm::MCTargetExpr*]: Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
Aborted (core dumped)

Please either implement adding commas while parsing the instruction string, some kind of error handling pointing out the missing commas or fix the example in the help text.