From 0618d38cdd3925f0d682ba0a76cd91e330cc1627 Mon Sep 17 00:00:00 2001
From: FeralChild64 <you@example.com>
Date: Fri, 26 Mar 2021 16:45:06 +0100
Subject: [PATCH] 65C02 code size optimization (22 bytes saved) in IEC code

---
 src/kernal/iec/iec_pull_release.s | 87 +++++++++++++++++++++++++++++--
 1 file changed, 83 insertions(+), 4 deletions(-)

diff --git a/src/kernal/iec/iec_pull_release.s b/src/kernal/iec/iec_pull_release.s
index 67b67ce2..8deb834f 100644
--- a/src/kernal/iec/iec_pull_release.s
+++ b/src/kernal/iec/iec_pull_release.s
@@ -14,6 +14,8 @@
 
 !ifdef CONFIG_IEC {
 
+!ifndef HAS_OPCODES_65C02 {
+
 
 iec_pull_atn_clk_release_data:
 
@@ -34,7 +36,7 @@ iec_pull_clk_release_data:
 iec_pull_clk_release_data_1:
 
 	and #$FF - BIT_CIA2_PRA_DAT_OUT    ; release
-	bne iec_pull_release_end           ; branch always
+	bne iec__pull_release_end          ; branch always
 
 iec_pull_clk_release_data_oneshot:
 
@@ -56,7 +58,7 @@ iec_release_clk_data:
 	and #$FF - BIT_CIA2_PRA_DAT_OUT    ; release
 	sta CIA2_PRA
 	and #$FF - BIT_CIA2_PRA_CLK_OUT    ; release
-	jmp iec_pull_release_end
+	+bra iec__pull_release_end
 	
 iec_release_clk_pull_data:
 
@@ -64,7 +66,7 @@ iec_release_clk_pull_data:
 	ora #BIT_CIA2_PRA_DAT_OUT          ; pull
 	sta CIA2_PRA
 	and #$FF - BIT_CIA2_PRA_CLK_OUT    ; release
-	bne iec_pull_release_end           ; branch always
+	bne iec__pull_release_end          ; branch always
 
 iec_pull_data_release_atn_clk:
 
@@ -83,8 +85,85 @@ iec_release_atn:
 
 	; FALLTROUGH
 
-iec_pull_release_end:
+iec__pull_release_end:
 
 	sta CIA2_PRA
 	rts
+
+
+} else {
+
+
+	; 65C02 version
+
+iec_pull_atn_clk_release_data:
+
+	lda #BIT_CIA2_PRA_ATN_OUT
+	tsb CIA2_PRA
+
+	; FALLTROUGH
+
+iec_pull_clk_release_data:
+
+	lda #BIT_CIA2_PRA_CLK_OUT
+	tsb CIA2_PRA
+	lda #BIT_CIA2_PRA_DAT_OUT
+	bra iec__pull_release_trb
+
+iec_pull_clk_release_data_oneshot:
+
+	lda CIA2_PRA
+	ora #BIT_CIA2_PRA_CLK_OUT          ; pull
+	and #$FF - BIT_CIA2_PRA_DAT_OUT    ; release
+	sta CIA2_PRA
+	rts
+
+iec_release_atn_clk_data:
+
+	lda #BIT_CIA2_PRA_ATN_OUT
+	trb CIA2_PRA
+
+	; FALLTROUGH
+
+iec_release_clk_data:
+
+	lda #BIT_CIA2_PRA_DAT_OUT
+	trb CIA2_PRA
+	bra iec__release_clk
+
+iec_release_clk_pull_data:
+
+	lda #BIT_CIA2_PRA_DAT_OUT
+	tsb CIA2_PRA
+
+	; FALLTROUGH
+
+iec__release_clk:
+
+	lda #BIT_CIA2_PRA_CLK_OUT
+	bra iec__pull_release_trb
+
+iec_pull_data_release_atn_clk:
+
+	lda #BIT_CIA2_PRA_DAT_OUT
+	tsb CIA2_PRA
+	lda #(BIT_CIA2_PRA_CLK_OUT + BIT_CIA2_PRA_ATN_OUT)
+	+skip_2_bytes_trash_nvz
+
+	; FALLTROUGH
+
+iec_release_atn:
+
+	lda #BIT_CIA2_PRA_ATN_OUT
+
+	; FALLTROUGH
+
+iec__pull_release_trb:
+
+	trb CIA2_PRA
+	rts
+
+
+}
+
 }