From 9a3a60cb138ea9a7fb29368c8c8efe614a7d80fe Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Mon, 26 Jan 2015 14:37:42 -0800
Subject: [PATCH] nir: Don't try to to-SSA ALU instructions that are already
 SSA.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
---
 src/glsl/nir/nir_to_ssa.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/glsl/nir/nir_to_ssa.c b/src/glsl/nir/nir_to_ssa.c
index 9c577fa9924..dbe1699c54c 100644
--- a/src/glsl/nir/nir_to_ssa.c
+++ b/src/glsl/nir/nir_to_ssa.c
@@ -239,6 +239,9 @@ rewrite_alu_instr_forward(nir_alu_instr *instr, rewrite_state *state)
 
    nir_foreach_src(&instr->instr, rewrite_use, state);
 
+   if (instr->dest.dest.is_ssa)
+      return;
+
    nir_register *reg = instr->dest.dest.reg.reg;
    unsigned index = reg->index;