i965/vs/skl: Use vec4 datatypes for message header

We're using a SIMD4x2 sampler message, which has execsize 4, and so the
register width must be <= 4.  Use <4,4,1> regioning instead of <8,8,1>
regioning to access the same data but avoid tripping the assert.

Fixes the following piglit tests:
spec/glsl-1.20/compiler/structure-and-array-operations/array-selection.vert
spec/glsl-es-3.00/compiler/uniform_block/interface-name-basic.vert
spec/glsl-es-3.00/compiler/uniform_block/interface-name-field-clashes-with-struct.vert
spec/glsl-es-3.00/compiler/uniform_block/interface-name-field-clashes-with-function.vert
spec/glsl-es-3.00/compiler/uniform_block/interface-name-array.vert
glslparsertest/glsl2/condition-07.vert
spec/glsl-es-3.00/compiler/uniform_block/interface-name-field-clashes-with-variable.vert

v2: Better commit message courtesy of Ken.
I had a discussion with Ken, and we both question how we end up with a mov and
execsize 4. For now though, this fixes the piglit tests, so we can worry about
it later.

Signed-off-by: Ben Widawsky <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs_generator.cpp b/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
index 8cd36f8ea3e..f7b8771f04d 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
@@ -1024,13 +1024,13 @@ fs_generator::generate_uniform_pull_constant_load_gen7(fs_inst *inst,
 
    if (brw->gen >= 9) {
       /* Skylake requires a message header in order to use SIMD4x2 mode. */
-      src = retype(brw_vec8_grf(offset.nr - 1, 0), BRW_REGISTER_TYPE_UD);
+      src = retype(brw_vec4_grf(offset.nr - 1, 0), BRW_REGISTER_TYPE_UD);
       mlen = 2;
       header_present = true;
 
       brw_push_insn_state(p);
       brw_set_default_mask_control(p, BRW_MASK_DISABLE);
-      brw_MOV(p, src, retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UD));
+      brw_MOV(p, src, retype(brw_vec4_grf(0, 0), BRW_REGISTER_TYPE_UD));
       brw_set_default_access_mode(p, BRW_ALIGN_1);
 
       brw_MOV(p, get_element_ud(src, 2),