[Bug gas/20318] x86 Intel mode accepts invalid instructions

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20318

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
----
        .text
        phadddb %xmm0, %xmm1
        phadddd %xmm0, %xmm1
        phadddl %xmm0, %xmm1
        phadddld %xmm0, %xmm1
        phadddq %xmm0, %xmm1
        phaddds %xmm0, %xmm1
        phadddw %xmm0, %xmm1
        .intel_syntax noprefix
        phadddb xmm0, xmm1
        phadddd xmm0, xmm1
        phadddl xmm0, xmm1
        phadddld xmm0, xmm1
        phadddq xmm0, xmm1
        phaddds xmm0, xmm1
        phadddw xmm0, xmm1
----

I got

y.s: Assembler messages:
y.s:2: Error: invalid instruction suffix for `phaddd'
y.s:3: Error: no such instruction: `phadddd %xmm0,%xmm1'
y.s:4: Error: invalid instruction suffix for `phaddd'
y.s:5: Error: no such instruction: `phadddld %xmm0,%xmm1'
y.s:6: Error: invalid instruction suffix for `phaddd'
y.s:7: Error: invalid instruction suffix for `phaddd'
y.s:8: Error: invalid instruction suffix for `phaddd'
y.s:12: Error: no such instruction: `phadddl xmm0,xmm1'
y.s:13: Error: no such instruction: `phadddld xmm0,xmm1'
y.s:15: Error: no such instruction: `phaddds xmm0,xmm1'

They fail under AT&T syntax with different error messages.

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