From: David Given <dg@cowlark.com>
Date: Sat, 1 Oct 2016 21:41:35 +0000 (+0200)
Subject: Fix edge case where leftover pushes would occasionally cause infinite loops in
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=65e75be42d22f05f2b151219d66d11c50a251543;p=ack.git

Fix edge case where leftover pushes would occasionally cause infinite loops in
the analysis.
---

diff --git a/mach/proto/mcg/pass_convertstackops.c b/mach/proto/mcg/pass_convertstackops.c
index c34eddf16..f5764484a 100644
--- a/mach/proto/mcg/pass_convertstackops.c
+++ b/mach/proto/mcg/pass_convertstackops.c
@@ -107,6 +107,11 @@ static void convert_block(struct procedure* proc, struct basicblock* bb)
             }
         }
 
+        /* If we didn't actually find anything, give up. */
+
+        if ((pushes.count == 0) || (pops.count == 0))
+            return;
+            
         /* Okay, now we can wire them all up. */
 
         for (i=0; i<pushes.count; i++)