From 3ef1d83866fa07a44cc6ff3908da3fb57de61142 Mon Sep 17 00:00:00 2001
From: Quentin Carbonneaux <quentin.carbonneaux@yale.edu>
Date: Tue, 22 Sep 2015 17:25:03 -0400
Subject: [PATCH] do not do dce on register assignments

---
 lisc/rega.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisc/rega.c b/lisc/rega.c
index e1f0a6d..ea42ad1 100644
--- a/lisc/rega.c
+++ b/lisc/rega.c
@@ -339,7 +339,7 @@ rega(Fn *fn)
 				if (!req(i->to, R)) {
 					assert(rtype(i->to) == RTmp);
 					r = rfree(&cur, i->to.val);
-					if (r == -1) {
+					if (r == -1 && !isreg(i->to)) {
 						*i = (Ins){.op = ONop};
 						continue;
 					}