agx: Add phi pseudo instruction

For SSA.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16268>

diff --git a/src/asahi/compiler/agx_opcodes.py b/src/asahi/compiler/agx_opcodes.py
index da4b48b..cb98bf6 100644 (file)
--- a/src/asahi/compiler/agx_opcodes.py
+++ b/src/asahi/compiler/agx_opcodes.py
@@ -255,3 +255,7 @@ op("or", _, srcs = 2)
 op("p_combine", _, srcs = 4)
 op("p_split", _, srcs = 1, dests = 4)
 op("p_extract", _, srcs = 1, imms = [COMPONENT])
+
+# Phis are special-cased in the IR as they (uniquely) can take an unbounded
+# number of source.
+op("phi", _, srcs = 0)