[Bug gas/22179] New: [RISCV] fmv.w.x and fmv.x.w opcodes are not recognised

[asb at lowrisc dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=22179

            Bug ID: 22179
           Summary: [RISCV] fmv.w.x and fmv.x.w opcodes are not recognised
           Product: binutils
           Version: 2.30 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: asb at lowrisc dot org
  Target Milestone: ---

The RISC-V 2.2 user-level ISA specification renamed fmv.s.x and fmv.x.s to
fmv.w.x and fmv.x.w respectively. gas doesn't recognise these mnemonics.
Additionally, objdump should probably prefer to print the new names in
preference to the old.

$ cat f.s 
fmv.x.w a2, fs7
fmv.x.s a2, fs7
fmv.w.x ft1, a6
fmv.s.x ft1, a6

$ ./riscv32-unknown-elf-as -march=rv32if f.s 
f.s: Assembler messages:
f.s:1: Error: unrecognized opcode `fmv.x.w a2,fs7'
f.s:3: Error: unrecognized opcode `fmv.w.x ft1,a6'

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