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diff z80.cpu @ 1719:fb5ae8c20b85

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Fix cp instruction in new Z80 core and implement its DD/FD prefixes
author Michael Pavone <pavone@retrodev.com>
date Wed, 30 Jan 2019 21:47:35 -0800
parents c7d18b8ec29a
children 1648c685083a
line wrap: on
line diff
--- a/z80.cpu	Wed Jan 30 18:55:58 2019 -0800
+++ b/z80.cpu	Wed Jan 30 21:47:35 2019 -0800
@@ -879,18 +879,53 @@
 	update_flags SZYH0PXN0C0
 
 10111RRR cp_reg
+	mov main.R last_flag_result
 	cmp main.R a
-	update_flags SZYHVXN1C
+	update_flags SZHVN1C
+	
+dd 10111100 cp_ixh
+	lsr ix 8 last_flag_result
+	cmp last_flag_result a
+	update_flags SZHVN1C
+	
+dd 10111101 cp_ixl
+	mov ix last_flag_result
+	cmp last_flag_result a
+	update_flags SZHVN1C
+	
+fd 10111100 cp_iyh
+	lsr iy 8 last_flag_result
+	cmp last_flag_result a
+	update_flags SZHVN1C
+	
+fd 10111101 cp_iyl
+	mov iy last_flag_result
+	cmp last_flag_result a
+	update_flags SZHVN1C
 	
 10111110 cp_hl
 	z80_fetch_hl
+	mov scratch1 last_flag_result
 	cmp scratch1 a
-	update_flags SZYHVXN1C
+	update_flags SZHVN1C
+	
+dd 10111110 cp_ixd
+	z80_fetch_index ix
+	mov scratch1 last_flag_result
+	cmp scratch1 a
+	update_flags SZHVN1C
+	
+fd 10111110 cp_iyd
+	z80_fetch_index iy
+	mov scratch1 last_flag_result
+	cmp scratch1 a
+	update_flags SZHVN1C
 
 11111110 cp_immed
 	z80_fetch_immed
+	mov scratch1 last_flag_result
 	cmp scratch1 a
-	update_flags SZYHVXN1C
+	update_flags SZHVN1C
 
 00RRR100 inc_reg
 	add 1 main.R main.R