zero vector usagee (Was: Re: RFA: gcc.dg/simd-1.c fix for x86)

[Aldy Hernandez]

>>>>> "Joern" == Joern Rennecke <joern.rennecke@superh.com> writes:

 > zero.  We need to decide if using the zero vector is just optional,

No.  It's not optional.  Zeros must always be equivalent to
CONST0_RTX[MODE].  This is true across the board in gcc.  Vector
constants are no different.

 > I've used gen_rtx_CONST_VECTOR in some cases where it might
 > generate a zero.

Uhh, your patches might be causing Daniel's problems.

Aldy