From 7cf2bffe8254de6808202d866598ec4c9afe1a51 Mon Sep 17 00:00:00 2001
From: Ilia Mirkin <imirkin@alum.mit.edu>
Date: Sat, 21 Feb 2015 03:12:54 -0500
Subject: [PATCH] nvc0/ir: patch vertex count is stored in the upper bits

---
 src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
index 56dbb5134d1..85dd05d5267 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
@@ -1525,6 +1525,10 @@ NVC0LoweringPass::handleRDSV(Instruction *i)
          i->op = OP_MOV;
          i->setSrc(0, bld.mkImm((sv == SV_NTID || sv == SV_NCTAID) ? 1 : 0));
       }
+      if (sv == SV_VERTEX_COUNT) {
+         bld.setPosition(i, true);
+         bld.mkOp2(OP_EXTBF, TYPE_U32, i->getDef(0), i->getDef(0), bld.mkImm(0x808));
+      }
       return true;
    }