2 files changed, 9 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 5e95d3a4ce7..69340f0bc9f 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -467,6 +467,14 @@ fs_reg::is_one() const
 }
 
 bool
+fs_reg::is_null() const
+{
+   return file == HW_REG &&
+          fixed_hw_reg.file == BRW_ARCHITECTURE_REGISTER_FILE &&
+          fixed_hw_reg.nr == BRW_ARF_NULL;
+}
+
+bool
 fs_reg::is_valid_3src() const
 {
    return file == GRF || file == UNIFORM;
diff --git a/src/mesa/drivers/dri/i965/brw_fs.h b/src/mesa/drivers/dri/i965/brw_fs.h
index a3a4dc0f141..c9b0aa1773c 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -77,6 +77,7 @@ public:
    bool equals(const fs_reg &r) const;
    bool is_zero() const;
    bool is_one() const;
+   bool is_null() const;
    bool is_valid_3src() const;
    fs_reg retype(uint32_t type);