i965/vec4: Ignore swizzle of VGRF for use by var_range_end().

var_range_end(v, n) loops over the n components of variable number v and
finds the maximum value, giving the last use of any component of v.
Therefore it expects v to correspond to the variable associated with the
.x channel of the VGRF.

var_from_reg() however returns the variable for the first channel of the
VGRF, post-swizzle.

So, if the last register had a swizzle with y, z, or w in the swizzle
component, we would read out of bounds. For any other register, we would
read liveness information from the next register.

The fix is to convert the src_reg to a dst_reg in order to call the
dst_reg version of var_from_reg() that doesn't consider the swizzle.

Cc: [email protected]
Reviewed-by: Francisco Jerez <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

0 files changed, 0 insertions, 0 deletions