From c685aa11b5012c00f032c3f03c7589513270fd77 Mon Sep 17 00:00:00 2001
From: em <none@none>
Date: Tue, 9 Sep 1986 13:10:15 +0000
Subject: [PATCH] set limit on optimization passes to prevent loop in optimizer
 in case of bad table.

---
 util/opt/peephole.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/util/opt/peephole.c b/util/opt/peephole.c
index 1a52beea7..3b013cb44 100644
--- a/util/opt/peephole.c
+++ b/util/opt/peephole.c
@@ -609,7 +609,9 @@ basicblock(alpp) line_p *alpp; {
 	register byte *bp;
 	int i;
 	short index;
+	int npasses;
 
+	npasses = 0;
 	do {	/* make pass over basicblock */
 	    lpp = alpp; madeopt = FALSE;
 	    while ((*lpp) != (line_p) 0 && ((*lpp)->l_instr&BMASK) != op_lab) {
@@ -648,5 +650,6 @@ basicblock(alpp) line_p *alpp; {
 		}
 		lpp = next;
 	    }
-	} while(madeopt);	/* as long as there is progress */
+	} while(madeopt && ++npasses<5000);	/* as long as there is progress */
+	assert(!madeopt);
 }
-- 
2.34.1