Mesa (master): nir: add nir_instr_is_first() and nir_instr_is_last() helpers

[Connor Abbott]

Module: Mesa
Branch: master
Commit: 8eea091747c9b12b21688b738145632b90d923cb
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=8eea091747c9b12b21688b738145632b90d923cb

Author: Connor Abbott <connor.w.abbott at intel.com>
Date:   Wed Jul 15 12:00:47 2015 -0700

nir: add nir_instr_is_first() and nir_instr_is_last() helpers

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Jason Ekstrand <jason.ekstrand at intel.com>
Signed-off-by: Connor Abbott <connor.w.abbott at intel.com>

---

 src/glsl/nir/nir.h |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h
index e9a506c..0db1fc3 100644
--- a/src/glsl/nir/nir.h
+++ b/src/glsl/nir/nir.h
@@ -443,6 +443,18 @@ nir_instr_prev(nir_instr *instr)
       return exec_node_data(nir_instr, prev, node);
 }
 
+static inline bool
+nir_instr_is_first(nir_instr *instr)
+{
+   return exec_node_is_head_sentinel(exec_node_get_prev(&instr->node));
+}
+
+static inline bool
+nir_instr_is_last(nir_instr *instr)
+{
+   return exec_node_is_tail_sentinel(exec_node_get_next(&instr->node));
+}
+
 typedef struct {
    /** for debugging only, can be NULL */
    const char* name;