From: cuz <cuz@b7a2c559-68d2-44c3-8de9-860c34a00d81>
Date: Mon, 4 Dec 2000 20:38:45 +0000 (+0000)
Subject: 65C02 optimizations
X-Git-Tag: V2.12.0~2992
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=e131b6e43286a0a0e4f1639236aa68c51962bf8d;p=cc65

65C02 optimizations


git-svn-id: svn://svn.cc65.org/cc65/trunk@548 b7a2c559-68d2-44c3-8de9-860c34a00d81
---

diff --git a/src/cc65/optimize.c b/src/cc65/optimize.c
index 4421a9bb6..8889e4fb8 100644
--- a/src/cc65/optimize.c
+++ b/src/cc65/optimize.c
@@ -4106,10 +4106,18 @@ static Line* OptOneBlock (Line* L)
 	     	Delete = 1;
 	    } else if (LineMatch (L, "\tlda\t(")) {
 	     	if (IsXAddrMode (L)) {
-	     	    /* lda (zp,x) - if Y and X are both zero, replace by
-		     * load indirect y and save one cycle in some cases.
+	     	    /* lda (zp,x). */
+		    /* If X is zero and we have a 65C02 cpu, replace it by
+		     * an indirect load.
 		     */
-	    	    if (X == 0 && Y == 0) {
+		    if (X == 0 && CPU == CPU_65C02) { 
+			unsigned Len = strlen (L->Line);
+			L->Line [Len-3] = ')';
+			L->Line [Len-2] = '\0';
+       	       	    /* If Y and X are both zero, replace by load indirect
+		     * y and save one cycle in some cases.
+		     */
+	    	    } else if (X == 0 && Y == 0) {
 		    	char Buf [256];
 		    	const char* S = L->Line + 6;
 		    	char* T = Buf + 6;
@@ -4123,6 +4131,15 @@ static Line* OptOneBlock (Line* L)
 	    	    	*T   = '\0';
 		    	L = ReplaceLine (L, Buf);
 		    }
+		} else if (IsYAddrMode (L)) {
+		    /* lda (zp),y. If Y is zero and we have a 65C02 CPU,
+		     * replace it by an indirect load.
+		     */
+		    if (Y == 0 && CPU == CPU_65C02) {
+			unsigned Len = strlen (L->Line);
+			L->Line [Len-3] = ')';
+			L->Line [Len-2] = '\0';
+		    }
 		}
 		/* In any case invalidate A */
 	    	A = -1;