From: Rob Clark <robclark@freedesktop.org>
Date: Mon, 11 Apr 2016 17:03:51 +0000 (-0400)
Subject: freedreno/ir3: hack to avoid getting stuck in a loop
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f68f6c0;p=mesa.git

freedreno/ir3: hack to avoid getting stuck in a loop

There are still some edge cases which result in a neighbor-loop.  Which
needs to be fixed, but this hack at least makes deqp tests finish.

Signed-off-by: Rob Clark <robclark@freedesktop.org>
---

diff --git a/src/gallium/drivers/freedreno/ir3/ir3.h b/src/gallium/drivers/freedreno/ir3/ir3.h
index 3859f6a39f3..f68275e568c 100644
--- a/src/gallium/drivers/freedreno/ir3/ir3.h
+++ b/src/gallium/drivers/freedreno/ir3/ir3.h
@@ -308,8 +308,14 @@ struct ir3_instruction {
 static inline struct ir3_instruction *
 ir3_neighbor_first(struct ir3_instruction *instr)
 {
-	while (instr->cp.left)
+	int cnt = 0;
+	while (instr->cp.left) {
 		instr = instr->cp.left;
+		if (++cnt > 0xffff) {
+			debug_assert(0);
+			break;
+		}
+	}
 	return instr;
 }
 
@@ -322,6 +328,10 @@ static inline int ir3_neighbor_count(struct ir3_instruction *instr)
 	while (instr->cp.right) {
 		num++;
 		instr = instr->cp.right;
+		if (num > 0xffff) {
+			debug_assert(0);
+			break;
+		}
 	}
 
 	return num;