[Bug gas/21176] New: [Aarch64]

[ashwinyes at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21176

            Bug ID: 21176
           Summary: [Aarch64]
           Product: binutils
           Version: 2.26
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: ashwinyes at gmail dot com
  Target Milestone: ---

Following syntax is wrong as per Aarch64 specification for vector by element
operations, but is accepted without any warnings/errors. 

fmul    v16.4s, v0.4s, v8.4s[0]
fmla    v20.4s, v0.4s, v8.2s[1]
fmla    v0.2d, v1.2d, v2.2d[0]

Correct syntax should be.

fmul    v16.4s, v0.4s, v8.s[0]
fmla    v20.4s, v0.4s, v8.s[1]
fmla    v0.2d, v1.2d, v2.d[0]


References:
https://github.com/xianyi/OpenBLAS/commit/278511ad2d1727a7ed74c38e3664b5e51b04adc6
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0802b/FMLA_advsimd_elt_vector.html

Thanks,
Ashwin

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