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Re: [RS6000 PATCH] Improved popcount/parity intrinsics for Power6
On Tue, Feb 06, 2007 at 10:59:16PM -0800, Ian Lance Taylor wrote:
> Personally I prefer meaningful constraints in define_expand, as a
> comment, but I don't feel very strongly about it. If we prefer to not
> use the constraint strings with define_expand, then perhaps we should
> change the gen* programs to not require them.
AFAIK no gen* programs require constraint strings, not even empty ones,
in define_expand. I'm getting away with this:
(define_expand "mov<mode>"
[(set (match_operand:LE16 0 "nonimmediate_operand")
(match_operand:LE16 1 "general_operand"))]
""
{
if (MEM_P (operands[0]) && MEM_P (operands[1]))
operands[1] = force_reg (<MODE>mode, operands[1]);
})
--
Rask Ingemann Lambertsen