Mesa (main): pan/bi: Add bi_{start, exit}_block helpers

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Module: Mesa
Branch: main
Commit: 75406a561fa11c2dcaa7b00dae40f68d806cd55c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=75406a561fa11c2dcaa7b00dae40f68d806cd55c

Author: Alyssa Rosenzweig <alyssa at collabora.com>
Date:   Thu Dec 23 11:06:59 2021 -0500

pan/bi: Add bi_{start, exit}_block helpers

Useful for data flow analysis.

Signed-off-by: Alyssa Rosenzweig <alyssa at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14298>

---

 src/panfrost/bifrost/compiler.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/panfrost/bifrost/compiler.h b/src/panfrost/bifrost/compiler.h
index fddc5217e9c..88cb252a520 100644
--- a/src/panfrost/bifrost/compiler.h
+++ b/src/panfrost/bifrost/compiler.h
@@ -647,6 +647,22 @@ typedef struct bi_block {
         uint8_t pass_flags;
 } bi_block;
 
+static inline bi_block *
+bi_start_block(struct list_head *blocks)
+{
+        bi_block *first = list_first_entry(blocks, bi_block, link);
+        assert(first->predecessors->entries == 0);
+        return first;
+}
+
+static inline bi_block *
+bi_exit_block(struct list_head *blocks)
+{
+        bi_block *last = list_last_entry(blocks, bi_block, link);
+        assert(!last->successors[0] && !last->successors[1]);
+        return last;
+}
+
 /* Subset of pan_shader_info needed per-variant, in order to support IDVS */
 struct bi_shader_info {
         struct panfrost_ubo_push *push;