From d8c79805148871aeee4314093f693a9a5351c80c Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Tue, 6 Jan 2009 11:23:58 -0800
Subject: [PATCH] comment sudoaddable; remove unused second parameter.

R=ken
OCL=22126
CL=22126
---
 src/cmd/6g/cgen.c  |  6 +++---
 src/cmd/6g/gen.c   |  6 +++---
 src/cmd/6g/gg.h    |  2 +-
 src/cmd/6g/gsubr.c | 16 ++++++++++++++--
 4 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/src/cmd/6g/cgen.c b/src/cmd/6g/cgen.c
index bddbfb3979..0ab1be5c10 100644
--- a/src/cmd/6g/cgen.c
+++ b/src/cmd/6g/cgen.c
@@ -66,7 +66,7 @@ cgen(Node *n, Node *res)
 			break;
 		}
 
-		if(sudoaddable(res, n->type, &addr)) {
+		if(sudoaddable(res, &addr)) {
 			a = optoas(OAS, res->type);
 			if(f) {
 				regalloc(&n2, res->type, N);
@@ -104,7 +104,7 @@ cgen(Node *n, Node *res)
 		goto ret;
 	}
 
-	if(sudoaddable(n, res->type, &addr)) {
+	if(sudoaddable(n, &addr)) {
 		a = optoas(OAS, n->type);
 		if(res->op == OREGISTER) {
 			p1 = gins(a, N, res);
@@ -340,7 +340,7 @@ abop:	// asymmetric binary
 		regalloc(&n1, nl->type, res);
 		cgen(nl, &n1);
 
-		if(sudoaddable(nr, nl->type, &addr)) {
+		if(sudoaddable(nr, &addr)) {
 			p1 = gins(a, N, &n1);
 			p1->from = addr;
 			gmove(&n1, res);
diff --git a/src/cmd/6g/gen.c b/src/cmd/6g/gen.c
index 0d0a647d93..12e5a11bd3 100644
--- a/src/cmd/6g/gen.c
+++ b/src/cmd/6g/gen.c
@@ -987,7 +987,7 @@ cgen_asop(Node *n)
 				gins(optoas(OINC, nl->type), N, nl);
 				goto ret;
 			}
-			if(sudoaddable(nl, nr->type, &addr)) {
+			if(sudoaddable(nl, &addr)) {
 				p1 = gins(optoas(OINC, nl->type), N, N);
 				p1->to = addr;
 				sudoclean();
@@ -1003,7 +1003,7 @@ cgen_asop(Node *n)
 				gins(optoas(ODEC, nl->type), N, nl);
 				goto ret;
 			}
-			if(sudoaddable(nl, nr->type, &addr)) {
+			if(sudoaddable(nl, &addr)) {
 				p1 = gins(optoas(ODEC, nl->type), N, N);
 				p1->to = addr;
 				sudoclean();
@@ -1031,7 +1031,7 @@ cgen_asop(Node *n)
 			goto ret;
 		}
 		if(nr->ullman < UINF)
-		if(sudoaddable(nl, nr->type, &addr)) {
+		if(sudoaddable(nl, &addr)) {
 			if(smallintconst(nr)) {
 				p1 = gins(optoas(n->etype, nl->type), nr, N);
 				p1->to = addr;
diff --git a/src/cmd/6g/gg.h b/src/cmd/6g/gg.h
index bd6f2a96af..a01e5b6e55 100644
--- a/src/cmd/6g/gg.h
+++ b/src/cmd/6g/gg.h
@@ -215,7 +215,7 @@ Plist*	newplist(void);
 int	isfat(Type*);
 void	setmaxarg(Type*);
 void	sudoclean(void);
-int	sudoaddable(Node*, Type*, Addr*);
+int	sudoaddable(Node*, Addr*);
 
 /*
  * list.c
diff --git a/src/cmd/6g/gsubr.c b/src/cmd/6g/gsubr.c
index a4cb8cb05c..3902a47c4f 100644
--- a/src/cmd/6g/gsubr.c
+++ b/src/cmd/6g/gsubr.c
@@ -1857,8 +1857,19 @@ sudoclean(void)
 	cleani -= 2;
 }
 
+/*
+ * generate code to compute address of n,
+ * a reference to a (perhaps nested) field inside
+ * an array or struct.  
+ * return 0 on failure, 1 on success.
+ * on success, leaves usable address in a.
+ *
+ * caller is responsible for calling sudoclean
+ * after successful sudoaddable,
+ * to release the register used for a.
+ */
 int
-sudoaddable(Node *n, Type *t, Addr *a)
+sudoaddable(Node *n, Addr *a)
 {
 	int o, i, w;
 	int oary[10];
@@ -1866,8 +1877,9 @@ sudoaddable(Node *n, Type *t, Addr *a)
 	Node n1, n2, *nn, *l, *r;
 	Node *reg, *reg1;
 	Prog *p1;
+	Type *t;
 
-	if(n->type == T || t == T)
+	if(n->type == T)
 		return 0;
 
 	switch(n->op) {
-- 
2.48.1