From 7f6bd8b0030c94fb99fa0d1a2111f13ddcb3421e Mon Sep 17 00:00:00 2001
From: Georg Lehmann <dadschoorse@gmail.com>
Date: Fri, 5 Dec 2025 12:04:19 +0100
Subject: [PATCH] nir/peephole_select: allow mbcnt_amd

It's just alu, so handle it like alu.

Foz-DB Navi21:
Totals from 3 (0.00% of 97591) affected shaders:
Instrs: 433 -> 426 (-1.62%)
CodeSize: 2408 -> 2388 (-0.83%)
Latency: 7520 -> 7925 (+5.39%)
InvThroughput: 857 -> 1009 (+17.74%)
Copies: 55 -> 43 (-21.82%)
Branches: 21 -> 17 (-19.05%)
SALU: 79 -> 76 (-3.80%)

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38828>
---
 src/compiler/nir/nir_opt_peephole_select.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/compiler/nir/nir_opt_peephole_select.c b/src/compiler/nir/nir_opt_peephole_select.c
index c989e86956f..ac2d51bd147 100644
--- a/src/compiler/nir/nir_opt_peephole_select.c
+++ b/src/compiler/nir/nir_opt_peephole_select.c
@@ -202,6 +202,7 @@ block_check_for_allowed_instrs(nir_block *block, unsigned *count,
          case nir_intrinsic_load_const_ir3:
          case nir_intrinsic_ballot:
          case nir_intrinsic_ballot_relaxed:
+         case nir_intrinsic_mbcnt_amd:
             if (!alu_ok)
                return false;
             break;