The VOP1, VOP2 and VOPC SDWA and DPP decoders read the modifier word at
wordIndex + 1 before SetRdnaRawWords checked that it exists, so a code
span ending at such an instruction was read one word past its end.
AddressSanitizer reports a heap-buffer-overflow in decodeVop2Sdwa on a
synthetic program. The six decoders now throw "truncated <encoding>
instruction" first, as DecodeRdnaVop3 and DecodeRdnaVop3p already do.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01R5WJS4ZdQynAJesCZKH5hb
Alberto Ruiz