Re: [PATCH 19/31] VAX: Add the `movmemhi' instruction

[Jeff Law via Gcc-patches]

On 11/19/20 8:35 PM, Maciej W. Rozycki wrote:
> The MOVC3 machine instruction has `memmove' semantics[1]:
>
> "The operation of the instruction is such that overlap of the source and
> destination strings does not affect the result."
>
> so use it to provide the `movmemhi' instruction as well.
>
> References:
>
> [1] DEC STD 032-0 "VAX Architecture Standard", Digital Equipment
>     Corporation, A-DS-EL-00032-00-0 Rev J, December 15, 1989, Section
>     3.10 "Character-String Instructions", p. 3-162
>
>       gcc/
>       * config/vax/vax.md (cpymemhi1): Rename insn to...
>       (movmemhi1): ... this.
>       (cpymemhi): Update accordingly.  Remove constraints.
>       (movmemhi): New expander.
>
>       gcc/testsuite/
>       * gcc.target/vax/movmem.c: New test.
OK
jeff