[llvm-commits] [PATCH] Allow reversed operand order in Tablegen tied-operand constraints.

[Lang Hames]

When specifying tied operand constraints ("$src = $dst") in tablegen the
order of the operands currently matters. If the operands are specified in
reverse order ("$dst = $src") tablegen barfs with an opaque "Illegal format
for tied-to constraint" error.

Does anyone know if there's any reason to prohibit the commuted form? If
there's not I'll apply this patch, which will allow the commuted form to be
parsed.

- Lang.
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