From 44987998225df5ee1ba2b2d32f89bb50204de5b7 Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Date: Mon, 18 Apr 2022 18:34:14 -0400
Subject: [PATCH] agx: Remove identity moves

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16268>
---
 src/asahi/compiler/agx_register_allocate.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/asahi/compiler/agx_register_allocate.c b/src/asahi/compiler/agx_register_allocate.c
index 29692c51510..fa5229a36d9 100644
--- a/src/asahi/compiler/agx_register_allocate.c
+++ b/src/asahi/compiler/agx_register_allocate.c
@@ -379,6 +379,14 @@ agx_ra(agx_context *ctx)
    agx_foreach_instr_global_safe(ctx, I) {
       if (I->op == AGX_OPCODE_PHI || I->op == AGX_OPCODE_P_LOGICAL_END)
          agx_remove_instruction(I);
+
+      /* Remove identity moves */
+      if (I->op == AGX_OPCODE_MOV && I->src[0].type == AGX_INDEX_REGISTER &&
+          I->dest[0].size == I->src[0].size && I->src[0].value == I->dest[0].value) {
+
+         assert(I->dest[0].type == AGX_INDEX_REGISTER);
+         agx_remove_instruction(I);
+      }
    }
 
    free(ssa_to_reg);