nir: Define AGX intrinsics for local pixel access

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19871>

src/compiler/nir/nir_intrinsics.py

@@ -1549,6 +1549,48 @@ store("tlb_sample_color_v3d", [1], [BASE, COMPONENT, SRC_TYPE], [])
 # the target framebuffer
 intrinsic("load_fb_layers_v3d", dest_comp=1, flags=[CAN_ELIMINATE, CAN_REORDER])
 
+# Load/store a pixel in local memory. This operation is formatted, with
+# conversion between the specified format and the implied register format of the
+# source/destination (for store/loads respectively). This mostly matters for
+# converting between floating-point registers and normalized memory formats.
+#
+# The format is the pipe_format of the local memory (the source), see
+# agx_internal_formats.h for the supported list.
+#
+# Logically, this loads/stores a single sample. The sample to load is
+# specified by the bitfield sample mask source. However, for stores multiple
+# bits of the sample mask may be set, which will replicate the value. For
+# pixel rate shading, use 0xFF as the mask to store to all samples regardless of
+# the sample count.
+#
+# All calculations are relative to an immediate byte offset into local
+# memory, which acts relative to the start of the sample. These instructions
+# logically access:
+#
+#   (((((y * tile_width) + x) * nr_samples) + sample) * sample_stride) + offset
+#
+# src[] = { sample mask }
+# base = offset
+load("local_pixel_agx", [1], [BASE, FORMAT], [CAN_REORDER, CAN_ELIMINATE])
+# src[] = { value, sample mask }
+# base = offset
+store("local_pixel_agx", [1], [BASE, WRITE_MASK, FORMAT], [CAN_REORDER])
+
+# Store a block from local memory into a bound image. Used to write out render
+# targets within the end-of-tile shader, although it is valid in general compute
+# kernels.
+#
+# The format is the pipe_format of the local memory (the source), see
+# agx_internal_formats.h for the supported list. The image format is
+# specified in the PBE descriptor.
+#
+# The image dimension is used to distinguish multisampled images from
+# non-multisampled images. It must be 2D or MS.
+#
+# src[] = { image index, logical offset within shared memory }
+intrinsic("block_image_store_agx", [1, 1], bit_sizes=[32, 16],
+          indices=[FORMAT, IMAGE_DIM], flags=[CAN_REORDER])
+
 # Logical complement of load_front_face, mapping to an AGX system value
 system_value("back_face_agx", 1, bit_sizes=[1, 32])