From 589338e8fcf097b19a3595b265823d0f7e3baabe Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Date: Tue, 6 Feb 2024 22:18:42 -0400
Subject: [PATCH] agx: sink wait_pix

No reason not to, noticed when poking at the earlier parts of the series.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27616>
---
 src/asahi/compiler/agx_pressure_schedule.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/asahi/compiler/agx_pressure_schedule.c b/src/asahi/compiler/agx_pressure_schedule.c
index 443bddcc9bb..82c2b81b5c0 100644
--- a/src/asahi/compiler/agx_pressure_schedule.c
+++ b/src/asahi/compiler/agx_pressure_schedule.c
@@ -179,6 +179,12 @@ choose_instr(struct sched_ctx *s)
          continue;
       }
 
+      /* Heuristic: sink wait_pix to increase parallelism. Since wait_pix does
+       * not read or write registers, this has no effect on pressure.
+       */
+      if (n->instr->op == AGX_OPCODE_WAIT_PIX)
+         return n;
+
       int32_t delta = calculate_pressure_delta(n->instr, s->live);
 
       if (delta < min_delta) {