[Bug target/124349] New: assemble failure "operand size mismatch for `vcomisbf16'" with -masm=intel

[zsojka at seznam dot cz via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124349

            Bug ID: 124349
           Summary: assemble failure "operand size mismatch for
                    `vcomisbf16'" with -masm=intel
           Product: gcc
           Version: 16.0
            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: x86_64-pc-linux-gnu

Created attachment 63816
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63816&action=edit
reduced testcase

Output:
$ gcc -mavx10.2 -masm=intel testcase.c                     
/tmp/ccUglaxO.s: Assembler messages:
/tmp/ccUglaxO.s:35: Error: operand size mismatch for `vcomisbf16'


The assembly is accepted when changed:
-       vcomisbf16      xmm0, XMMWORD PTR [rbp-16]
+       vcomisbf16      xmm0, WORD PTR [rbp-16]
the instruction compares only the first vector element.

This can be observed even with current binutils HEAD:
$ as -v
GNU assembler version 2.46.50 (x86_64-pc-linux-gnu) using BFD version (Gentoo
9999 p1) 2.46.50.20260302