qbe

commit bcc90d074e91c8e5d65876225d0b9f2c91c4248d
parent b15a6d47dc666d660c9cb5b7b75337492896902c
Author: Quentin Carbonneaux <quentin@c9x.me>
Date:   Sat,  9 Mar 2019 22:35:09 +0100

make sure phis are temporaries in rega

In fact, after spilling, a phi
can be a temporary or a slot.

I am now pondering whether this
is a good idea or not because
it causes annoying mem->mem
movs after register allocation.

Diffstat:
M
rega.c
 | 
4
++--

1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/rega.c b/rega.c
@@ -562,8 +562,8 @@ rega(Fn *fn)
 		 * predecessor, we have to find the
 		 * corresponding argument */
 		for (p=s->phi; p; p=p->link) {
-			r = rfind(m, p->to.val);
-			if (r == -1)
+			if (rtype(p->to) != RTmp
+			|| (r=rfind(m, p->to.val)) == -1)
 				continue;
 			for (u=0; u<p->narg; u++) {
 				b = p->blk[u];