From 977d93dc6728c890b502bf45ad4bd854a5df2d65 Mon Sep 17 00:00:00 2001
From: ceriel <none@none>
Date: Fri, 1 Feb 1991 10:21:39 +0000
Subject: [PATCH] reduce memory usage (again)

---
 util/opt/line.h    | 1 -
 util/opt/process.c | 6 +++---
 util/opt/tes.c     | 7 ++-----
 3 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/util/opt/line.h b/util/opt/line.h
index f282e9e4b..502467b25 100644
--- a/util/opt/line.h
+++ b/util/opt/line.h
@@ -70,7 +70,6 @@ typedef union {
 
 struct line {
 	line_p		l_next;		/* maintains linked list */
-	line_p		l_prev;		/* for back referencing loc's */
 	byte		l_instr;	/* instruction number */
 	byte		l_optyp;	/* specifies what follows */
 	un_l_a		l_a;
diff --git a/util/opt/process.c b/util/opt/process.c
index 9f860f0d9..ce3a6282f 100644
--- a/util/opt/process.c
+++ b/util/opt/process.c
@@ -191,14 +191,14 @@ symvalue() {
 
 do_tes()
 {
-	register line_p insptr = instrs, oldlin = NULL;
+	register line_p insptr = instrs, oldlin = NULL, oldlin2 = NULL;
 
 	init_state();
 	tes_pseudos();
 	while (insptr != NULL) {
-		insptr->l_prev = oldlin;
+		tes_instr(insptr, oldlin, oldlin2);
+		oldlin2 = oldlin;
 		oldlin = insptr;
-		tes_instr(insptr);
 		insptr = insptr->l_next;
 	}
 }
diff --git a/util/opt/tes.c b/util/opt/tes.c
index 355042a51..6e484f0bd 100644
--- a/util/opt/tes.c
+++ b/util/opt/tes.c
@@ -30,7 +30,6 @@ extern char flow_tab[];
 
 #define INSTR(lnp)      (lnp->l_instr & BMASK)
 #define TYPE(lnp)       lnp->l_optyp
-#define PREV(lnp)       lnp->l_prev
 #define SHORT(lnp)      lnp->l_a.la_short
 #define MINI(lnp)	((lnp->l_optyp & BMASK) - Z_OPMINI)
 
@@ -69,14 +68,12 @@ tes_pseudos()
 	}
 }
 
-tes_instr(lnp)
-line_p lnp;
+tes_instr(lnp, x, y)
+line_p lnp, x, y;
 {
 	char *s;
 	register instr = INSTR(lnp);
 	register int arg, argdef;
-	line_p x = PREV(lnp);
-	line_p y = (x == (line_p) 0 ? (line_p) 0 : PREV(x));
 	int neg = 0;
 
 	if (instr == op_lab) {
-- 
2.34.1