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Typically people resort to hard-coding the involved registers, thus being able to express things via .byte. To overcome this limitation (to a sufficient degree at least), introduce .insn. This allows users to specify operands in their "normal" shape (possibly in slightly altered order). Peculiarities require two small syntax extensions; see the implementation or documentation for details. In order to re-use sufficiently much of the functionality md_assemble() already uses, some adjustments to existing code were necessary. The one item to call out here is the partial re-write of build_modrm_byte() (patch 7), which actually turned out to simplify things. Subsequently possible further tidying is carried out right away (patches 8 and 9), even if not strictly related to the .insn work. I'm pretty sure there are still corner cases which aren't taken care of correctly. It's also quite possible that I've overlooked further places in pre-existing code which need tweaking for .insn. People taking a close look and/or playing with the new functionality would be much appreciated. The last patch in the series is strictly RFC, as I'm uncertain whether we actually want this kind of a testcase. 01: introduce .insn directive 02: parse VEX and alike specifiers for .insn 03: parse special opcode modifiers for .insn 04: use set_rex_vrex() also for short-form handling 05: move more disp processing out of md_assemble() 06: adjust REX-prefix part of SSE2AVX test 07: re-work build_modrm_byte()'s register assignment 08: VexVVVV is now merely a boolean 09: drop "shimm" special case template expansions 10: AT&T: restrict recognition of the "absolute branch" prefix character 11: process instruction operands for .insn 12: decouple broadcast type and bytes fields 13: handle EVEX Disp8 for .insn 14: allow for multiple immediates in output_disp() 15: handle immediate operands for .insn 16: document .insn 17: convert testcases to use .insn 18: .insn example - VEX-encoded instructions of original Xeon Phi Jan