From: uz <uz@b7a2c559-68d2-44c3-8de9-860c34a00d81>
Date: Thu, 27 Aug 2009 16:59:26 +0000 (+0000)
Subject: Try to generate more predicable code. clc always before adc or sbc.
X-Git-Tag: V2.13.0rc1~200
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=55e8f67640d1bac23945d064fcea41986a0c3e79;p=cc65

Try to generate more predicable code. clc always before adc or sbc.


git-svn-id: svn://svn.cc65.org/cc65/trunk@4056 b7a2c559-68d2-44c3-8de9-860c34a00d81
---

diff --git a/src/cc65/codegen.c b/src/cc65/codegen.c
index 6527e76d1..a905e7128 100644
--- a/src/cc65/codegen.c
+++ b/src/cc65/codegen.c
@@ -3235,13 +3235,18 @@ void g_inc (unsigned flags, unsigned long val)
                     if (val >= 0x300) {
                        	AddCodeLine ("inx");
                     }
-                } else {
+                } else if ((val & 0xFF) != 0) {
                     AddCodeLine ("clc");
-                    if ((val & 0xFF) != 0) {
-             	       	AddCodeLine ("adc #$%02X", (unsigned char) val);
-                    }
+                    AddCodeLine ("adc #$%02X", (unsigned char) val);
+                    AddCodeLine ("pha");
+                    AddCodeLine ("txa");
+                    AddCodeLine ("adc #$%02X", (unsigned char) (val >> 8));
+                    AddCodeLine ("tax");
+                    AddCodeLine ("pla");
+                } else {
                     AddCodeLine ("pha");
                     AddCodeLine ("txa");
+                    AddCodeLine ("clc");
                     AddCodeLine ("adc #$%02X", (unsigned char) (val >> 8));
                     AddCodeLine ("tax");
                     AddCodeLine ("pla");