From: Alan Cox <alan@linux.intel.com>
Date: Thu, 14 Dec 2017 13:43:52 +0000 (+0000)
Subject: 6502/65c816: introduce a regptr hint
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=b4bec8ffb2503b1eeca408b8334e0ab0240511d7;p=FUZIX.git

6502/65c816: introduce a regptr hint

We need this because cc65 writes *far* better code if you tell it to mark
key structure pointers as register so it can then use zp based offset addressing
on them
---

diff --git a/Kernel/cpu-6502/cpu.h b/Kernel/cpu-6502/cpu.h
index 009ad946..9c3ce28d 100644
--- a/Kernel/cpu-6502/cpu.h
+++ b/Kernel/cpu-6502/cpu.h
@@ -62,3 +62,6 @@ typedef union {            /* this structure is endian dependent */
 #define ntohs(x)	((((x) & 0xFF) << 8) | (((x) & 0xFF00) >> 8))
 
 #define CPUTYPE	CPUTYPE_6502
+
+/* cc65 really wants register tags on struct pointers used repeatedly */
+#define regptr	register
diff --git a/Kernel/cpu-65c816/cpu.h b/Kernel/cpu-65c816/cpu.h
index de24ec4d..e5820046 100644
--- a/Kernel/cpu-65c816/cpu.h
+++ b/Kernel/cpu-65c816/cpu.h
@@ -75,3 +75,6 @@ typedef union {            /* this structure is endian dependent */
 #define ntohs(x)	((((x) & 0xFF) << 8) | (((x) & 0xFF00) >> 8))
 
 #define CPUTYPE	CPUTYPE_65C816
+
+/* cc65 really wants structs used repeatedly to be marked register */
+#define regptr	register