ilo: replace cmd by dw0 in GPE

With e3c251071b0c9396c3ec76d1cf943c60ae297281, the magic values are gone.  We
no longer need "cmd" to hide them.  Replace it by dw0.
ilo: fix bound check for 3DSTATE_URB_VS

Fix max/min entries on GEN7.5 GT2/GT3.
ilo: set INTEL_RELOC_GGTT only on GEN6

We asked MI commands to use GGTT only on GEN6.
i965: Use unreachable() to silence warning.

brw_meta_fast_clear.c:211:17: warning: 'x_scaledown' may be used
uninitialized in this function [-Wmaybe-uninitialized]
    unsigned int x_scaledown, y_scaledown;

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
i965/vec4: Update register coalescing test.

In commit 04895f5c I added support for reswizzling writemasks. This test
was checking that we didn't support this.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=82881
i965: Add 2x MSAA support to Broadwell fast clear code.

According to the cited documentation section (but in the newer docs),
x_scaledown is the same for 2x and 4x MSAA.

+47 piglits.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=83081
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Cc: "10.3" <mesa-stable@lists.freedesktop.org>
i965/vec4: inline generate_vec4_instruction() within generate_code()

Suggested by Matt. This patch combines and moves back the code-generation
functions from generate_vec4_instruction() into generate_code(). Makes
generate_code() a bit larger, but helps us to count loops in a
straightforward manner.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
i965/vec4/fs: Count loops in shader debug

Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
glsl: Add ir_unop_saturate

Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
glsl: Add constant evaluation of ir_unop_saturate

v2: Use CLAMP macro (Ian Romanick)

Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
glsl: Add a pass to lower ir_unop_saturate to clamp(x, 0, 1)

Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
ir_to_mesa, glsl_to_tgsi: lower ir_unop_saturate

Needed when vertex programs doesn't allow saturate

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
ir_to_mesa, glsl_to_tgsi: Add support for ir_unop_saturate

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
i965/fs: Add support for ir_unop_saturate

Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
yi965/vec4: Add support for ir_unop_saturate

Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
glsl: Implement saturate as ir_unop_saturate

Now that we have the ir_unop_saturate implemented as a single
instruction, generate the correct simplified expression.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
glsl: Optimize clamp(x, 0, 1) as saturate(x)

v2: - Check that the base type is float (Ian Romanick)
v3: - Make sure comments reflect that we are doing a commutative operation
    - Add missing condition where the inner constant is 1.0 and outer constant is 0.0
    - Make indexing of operands easier to read (Matt Turner)

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
glsl: Optimize clamp(x, 0.0, b), where b < 1.0 as min(saturate(x),b)

v2: - Output min(saturate(x),b) instead of saturate(min(x,b)) suggested by Ilia Mirkin
    - Make sure we do component-wise comparison for vectors (Ian Romanick)
v3: - Add missing condition where the outer constant value is zero and
      inner constant is < 1
    - Fix comments to reflect we are doing a commutative operation (Matt Turner)

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
glsl: Optimize clamp(x, b, 1.0), where b > 0.0 as max(saturate(x),b)

v2: - Output max(saturate(x),b) instead of saturate(max(x,b))
    - Make sure we do component-wise comparison for vectors (Ian Romanick)
v3: - Add missing condition where the outer constant value is > 0.0 and
      inner constant is 1.0.
    - Fix comments to show that the optimization is a commutative operation
      (Matt Turner)

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
i965/fs: Allow propagation of instructions with saturate flag to sel

When sel conditon is bounded within 0 and 1.0. This allows code as:
	mov.sat a b
	sel.ge  dst a 0.25F

To be propagated as:
	sel.ge.sat dst b 0.25F

v3: Syntax clarifications in inst->saturate assignment (Matt Turner)

Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>