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* doc/c-arm.texi: Add documentation for .dn/.qn directives.
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@ -1,3 +1,7 @@
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2007-03-26 Julian Brown <julian@codesourcery.com>
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* doc/c-arm.texi: Add documentation for .dn/.qn directives.
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2007-03-26 Alan Modra <amodra@bigpond.net.au>
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* doc/as.texinfo (Reloc): Document.
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@ -391,7 +391,7 @@ example:
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@cindex @code{unreq} directive, ARM
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@item .unreq @var{alias-name}
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This undefines a register alias which was previously defined using the
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@code{req} directive. For example:
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@code{req}, @code{dn} or @code{qn} directives. For example:
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@smallexample
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foo .req r0
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@ -402,6 +402,36 @@ An error occurs if the name is undefined. Note - this pseudo op can
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be used to delete builtin in register name aliases (eg 'r0'). This
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should only be done if it is really necessary.
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@cindex @code{dn} and @code{qn} directives, ARM
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@item @var{name} .dn @var{register name} [@var{.type}] [@var{[index]}]
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@item @var{name} .qn @var{register name} [@var{.type}] [@var{[index]}]
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The @code{dn} and @code{qn} directives are used to create typed
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and/or indexed register aliases for use in Advanced SIMD Extension
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(Neon) instructions. The former should be used to create aliases
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of double-precision registers, and the latter to create aliases of
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quad-precision registers.
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If these directives are used to create typed aliases, those aliases can
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be used in Neon instructions instead of writing types after the mnemonic
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or after each operand. For example:
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@smallexample
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x .dn d2.f32
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y .dn d3.f32
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z .dn d4.f32[1]
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vmul x,y,z
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@end smallexample
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This is equivalent to writing the following:
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@smallexample
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vmul.f32 d2,d3,d4[1]
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@end smallexample
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Aliases created using @code{dn} or @code{qn} can be destroyed using
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@code{unreq}.
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@cindex @code{code} directive, ARM
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@item .code @code{[16|32]}
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This directive selects the instruction set being generated. The value 16
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