Mesa (master): i965/vec4: Add is_null() method to dst_reg.

[Matt Turner]

Module: Mesa
Branch: master
Commit: 10dd6eca89951e0cb40e21c3b53caa33d8fcb383
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=10dd6eca89951e0cb40e21c3b53caa33d8fcb383

Author: Matt Turner <mattst88 at gmail.com>
Date:   Thu Mar 13 11:21:36 2014 -0700

i965/vec4: Add is_null() method to dst_reg.

Reviewed-by: Eric Anholt <eric at anholt.net>

---

 src/mesa/drivers/dri/i965/brw_vec4.cpp |    8 ++++++++
 src/mesa/drivers/dri/i965/brw_vec4.h   |    2 ++
 2 files changed, 10 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp b/src/mesa/drivers/dri/i965/brw_vec4.cpp
index 702b182..62c2314 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
@@ -213,6 +213,14 @@ dst_reg::dst_reg(src_reg reg)
 }
 
 bool
+dst_reg::is_null() const
+{
+   return file == HW_REG &&
+          fixed_hw_reg.file == BRW_ARCHITECTURE_REGISTER_FILE &&
+          fixed_hw_reg.nr == BRW_ARF_NULL;
+}
+
+bool
 vec4_instruction::is_send_from_grf()
 {
    switch (opcode) {
diff --git a/src/mesa/drivers/dri/i965/brw_vec4.h b/src/mesa/drivers/dri/i965/brw_vec4.h
index 5e5ef03..159a5bd 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.h
+++ b/src/mesa/drivers/dri/i965/brw_vec4.h
@@ -194,6 +194,8 @@ public:
 
    explicit dst_reg(src_reg reg);
 
+   bool is_null() const;
+
    int writemask; /**< Bitfield of WRITEMASK_[XYZW] */
 
    src_reg *reladdr;