i965/fs: recognize writes with a subreg_offset > 0 as partial

Usually, writes to a subreg_offset > 0 would also have a stride > 1
and we would recognize them as partial, however, there is one case
where this does not happen, that is when we generate code for 64-bit
imemdiates in gen7, where we produce something like this:

mov(8) vgrf10:UD, <low 32-bit>
mov(8) vgrf10+0.4:UD, <high 32-bit>

and then we use the result with a stride of 0, as in:

mov(8) vgrf13:DF, vgrf10<0>:DF

Although we could try to avoid this issue by producing different code
for this by using writes with a stride of 2, that runs into other
problems affecting gen7 and the fact is that any instruction that
writes to a subreg_offset > 0 is a partial write so we should really
recognize them as such.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/i965/brw_fs.cpp

@@ -700,7 +700,8 @@ fs_inst::is_partial_write() const
 {
    return ((this->predicate && this->opcode != BRW_OPCODE_SEL) ||
            (this->exec_size * type_sz(this->dst.type)) < 32 ||
-           !this->dst.is_contiguous());
+           !this->dst.is_contiguous() ||
+           this->dst.subreg_offset > 0);
 }
 
 unsigned