Add rudimentary constant folding.

2 files changed, 3 insertions, 0 deletions

diff --git a/opt/Makefile b/opt/Makefile
index 636140a..3dacc1d 100644
--- a/opt/Makefile
+++ b/opt/Makefile
@@ -1,5 +1,6 @@
 LIB=libopt.a
 OBJ=cfg.o \
+    fold.o \
     df.o \
 
 DEPS=../parse/libparse.a
diff --git a/opt/opt.h b/opt/opt.h
index 745dea1..dcdfc62 100644
--- a/opt/opt.h
+++ b/opt/opt.h
@@ -24,6 +24,8 @@ struct Bb {
     Bitset *succ;
 };
 
+/* expression folding */
+Node *fold(Node *n);
 /* Takes a reduced block, and returns a flow graph. */
 Cfg *mkcfg(Node **nl, size_t nn);
 void dumpcfg(Cfg *c, FILE *fd);