nir: Add atomic operations on variables

This allows us to first generate atomic operations for shared
variables using these opcodes, and then later we can lower those to
the shared atomics intrinsics with nir_lower_io.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>

diff --git a/src/glsl/nir/nir_intrinsics.h b/src/glsl/nir/nir_intrinsics.h
index 78c25707dc90caa526a5456e7ddc4f8909a51ab6..b6996ee3f4746727bdac809f0cd497a047f5eca7 100644 (file)
--- a/src/glsl/nir/nir_intrinsics.h
+++ b/src/glsl/nir/nir_intrinsics.h
@@ -194,6 +194,33 @@ INTRINSIC(image_samples, 0, ARR(), true, 1, 1, 0,
 INTRINSIC(vulkan_resource_index, 1, ARR(1), true, 1, 0, 3,
           NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
 
+/*
+ * variable atomic intrinsics
+ *
+ * All of these variable atomic memory operations read a value from memory,
+ * compute a new value using one of the operations below, write the new value
+ * to memory, and return the original value read.
+ *
+ * All operations take 1 source except CompSwap that takes 2. These sources
+ * represent:
+ *
+ * 0: The data parameter to the atomic function (i.e. the value to add
+ *    in shared_atomic_add, etc).
+ * 1: For CompSwap only: the second data parameter.
+ *
+ * All operations take 1 variable deref.
+ */
+INTRINSIC(var_atomic_add, 1, ARR(1), true, 1, 1, 0, 0)
+INTRINSIC(var_atomic_imin, 1, ARR(1), true, 1, 1, 0, 0)
+INTRINSIC(var_atomic_umin, 1, ARR(1), true, 1, 1, 0, 0)
+INTRINSIC(var_atomic_imax, 1, ARR(1), true, 1, 1, 0, 0)
+INTRINSIC(var_atomic_umax, 1, ARR(1), true, 1, 1, 0, 0)
+INTRINSIC(var_atomic_and, 1, ARR(1), true, 1, 1, 0, 0)
+INTRINSIC(var_atomic_or, 1, ARR(1), true, 1, 1, 0, 0)
+INTRINSIC(var_atomic_xor, 1, ARR(1), true, 1, 1, 0, 0)
+INTRINSIC(var_atomic_exchange, 1, ARR(1), true, 1, 1, 0, 0)
+INTRINSIC(var_atomic_comp_swap, 2, ARR(1, 1), true, 1, 1, 0, 0)
+
 /*
  * SSBO atomic intrinsics
  *