[Bug target/94591] New: [8/9/10 Regression] Assembler messages: Error: operand mismatch -- `rev64 v0.2d,v0.2d'

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94591

            Bug ID: 94591
           Summary: [8/9/10 Regression] Assembler messages: Error: operand
                    mismatch -- `rev64 v0.2d,v0.2d'
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: assemble-failure
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: aarch64-unknown-linux-gnu

Created attachment 48266
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48266&action=edit
reduced testcase

Compiler output:
$ aarch64-unknown-linux-gnu-gcc testcase.c
/tmp/ccPr88U5.s: Assembler messages:
/tmp/ccPr88U5.s:13: Error: operand mismatch -- `rev64 v0.2d,v0.2d'
/tmp/ccPr88U5.s:13: Info:    did you mean this?
/tmp/ccPr88U5.s:13: Info:       rev64 v0.8b, v0.8b
/tmp/ccPr88U5.s:13: Info:    other valid variant(s):
/tmp/ccPr88U5.s:13: Info:       rev64 v0.16b, v0.16b
/tmp/ccPr88U5.s:13: Info:       rev64 v0.4h, v0.4h
/tmp/ccPr88U5.s:13: Info:       rev64 v0.8h, v0.8h
/tmp/ccPr88U5.s:13: Info:       rev64 v0.2s, v0.2s
/tmp/ccPr88U5.s:13: Info:       rev64 v0.4s, v0.4s

According to
https://developer.arm.com/docs/dui0801/latest/a64-simd-vector-instructions/rev64-vector
, the operand is invalid.

$ aarch64-unknown-linux-gnu-gcc -v        
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-aarch64/bin/aarch64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r10-7709-20200413231231-g7eee265e6bd-checking-yes-rtl-df-extra-aarch64/bin/../libexec/gcc/aarch64-unknown-linux-gnu/10.0.1/lto-wrapper
Target: aarch64-unknown-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-cloog --with-ppl --with-isl
--with-sysroot=/usr/aarch64-unknown-linux-gnu --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=aarch64-unknown-linux-gnu
--with-ld=/usr/bin/aarch64-unknown-linux-gnu-ld
--with-as=/usr/bin/aarch64-unknown-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r10-7709-20200413231231-g7eee265e6bd-checking-yes-rtl-df-extra-aarch64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.1 20200414 (experimental) (GCC)