qbe

commit 5668e93147563c824e693255de5e58fdc398a36b
parent c62b1754424046fea6abe3413f736a9483fa22a7
Author: Quentin Carbonneaux <quentin.carbonneaux@yale.edu>
Date:   Sun, 16 Aug 2015 19:18:40 -0400

refine the clobber code

It could very well be that the temporary we
assign already got assigned to the right
register!  Good things happen.

Diffstat:
M
lisc/rega.c
 | 
2
+-

1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lisc/rega.c b/lisc/rega.c
@@ -233,7 +233,7 @@ dopm(Blk *b, Ins *i, RMap *m)
 	else if (isreg(i->arg[0]))
 		for (;; i--) {
 			r = RBASE(i->arg[0].val);
-			if (BGET(m->b, r)) {
+			if (BGET(m->b, r) && rfind(m, i->to.val) != r) {
 				for (n=0; m->r[n] != r; n++)
 					assert(n+1 < m->n);
 				t = m->t[n];