On Mon, Jun 12, 2017 at 11:40:17AM -0700, Carl E. Love wrote:
> OK, so sounds like I should stick to the general wa register constraint.
> The third field of the define_expand I have what I believe is called the
> "condition string" as "TARGET_VSX". Is that the appropriate condition
> string? I see conditions string "VECTOR_UNIT_VSX_P (V4SFmode)" also
> used. Segher is thinking that this string would have the same effect as
> "TARGET_VSX"??
rs6000.c has
if (TARGET_VSX)
{
rs6000_vector_unit[V4SFmode] = VECTOR_VSX;
which makes VECTOR_UNIT_VSX_P (V4SFmode) the same as TARGET_VSX.
> How does one select the correct condition string based
> on the register constraint?
You don't: you decide both of those based on what you need for the
insn at hand.
Segher
