Mesa (master): panfrost/midgard: Add perspective division opcodes

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Module: Mesa
Branch: master
Commit: fc472007e7a2d2f33fbf9692355d4b6ece73b49a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=fc472007e7a2d2f33fbf9692355d4b6ece73b49a

Author: Alyssa Rosenzweig <alyssa.rosenzweig at collabora.com>
Date:   Mon Jun 10 11:05:40 2019 -0700

panfrost/midgard: Add perspective division opcodes

...on the load/store unit, not the ALUs. Looks goofy but hey.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig at collabora.com>

---

 src/gallium/drivers/panfrost/midgard/midgard.h     | 7 +++++++
 src/gallium/drivers/panfrost/midgard/midgard_ops.c | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/src/gallium/drivers/panfrost/midgard/midgard.h b/src/gallium/drivers/panfrost/midgard/midgard.h
index 68e969ccf9c..980a968cbe9 100644
--- a/src/gallium/drivers/panfrost/midgard/midgard.h
+++ b/src/gallium/drivers/panfrost/midgard/midgard.h
@@ -371,6 +371,13 @@ typedef enum {
         /* Used in OpenCL. Probably can ld other things as well */
         midgard_op_ld_global_id = 0x10,
 
+        /* The L/S unit can do perspective division a clock faster than the ALU
+         * if you're lucky. Put the vec4 in r27, and call with 0x24 as the
+         * unknown state; the output will be <x/w, y/w, z/w, 1>. Replace w with
+         * z for the z version */
+        midgard_op_ldst_perspective_division_z = 0x12,
+        midgard_op_ldst_perspective_division_w = 0x13,
+
         /* val in r27.y, address embedded, outputs result to argument. Invert val for sub. Let val = +-1 for inc/dec. */
         midgard_op_atomic_add = 0x40,
         midgard_op_atomic_and = 0x44,
diff --git a/src/gallium/drivers/panfrost/midgard/midgard_ops.c b/src/gallium/drivers/panfrost/midgard/midgard_ops.c
index 693fb56124d..85981dbef5b 100644
--- a/src/gallium/drivers/panfrost/midgard/midgard_ops.c
+++ b/src/gallium/drivers/panfrost/midgard/midgard_ops.c
@@ -153,6 +153,8 @@ struct mir_op_props alu_opcode_props[256] = {
 const char *load_store_opcode_names[256] = {
         [midgard_op_st_cubemap_coords] = "st_cubemap_coords",
         [midgard_op_ld_global_id] = "ld_global_id",
+        [midgard_op_ldst_perspective_division_z] = "ldst_perspective_division_z",
+        [midgard_op_ldst_perspective_division_w] = "ldst_perspective_division_w",
 
         [midgard_op_atomic_add] = "atomic_add",
         [midgard_op_atomic_and] = "atomic_and",