From: Joshua Wise <joshua@rebirth.joshuawise.com>
Date: Sun, 11 May 2008 11:04:03 +0000 (-0400)
Subject: Fix some carry-related bugs and a typo in insn_alu_a.
X-Git-Url: http://git.joshuawise.com/fpgaboy.git/commitdiff_plain/25f4912ce5d2a6c70a9f604502303a17359b19ec?hp=207251ed32471a6c5fba766d7f73e92a8d86b7cf

Fix some carry-related bugs and a typo in insn_alu_a.
---

diff --git a/core/insn_add_hl.v b/core/insn_add_hl.v
index 0d85f95..bfd6880 100644
--- a/core/insn_add_hl.v
+++ b/core/insn_add_hl.v
@@ -25,7 +25,7 @@
 				`_F <=	{ /* Z */ `_F[7],
 					  /* N */ 1'b0,
 					  /* H */ (({`_HL} + {tmp,tmp2}) & 16'h1000) ? 1'b1 : 1'b0,
-					  /* C */ (({1'b0,`_HL} + {1'b0,tmp,tmp2}) >> 16 == 1) ? 1'b1 : 1'b0,
+					  /* C */ (({1'b0,`_HL} + {1'b0,tmp,tmp2}) & 17'h10000) ? 1'b1 : 1'b0,
 					  `_F[3:0]
 					};
 				`_HL <= {tmp, tmp2};
diff --git a/core/insn_alu8.v b/core/insn_alu8.v
index 1283a9c..26fc77e 100644
--- a/core/insn_alu8.v
+++ b/core/insn_alu8.v
@@ -69,21 +69,21 @@
 			end
 			`INSN_alu_AND: begin
 				`_A <= `_A & tmp;
-				`_F <=	{ /* Z */ ((`_A & tmp) == 0) ? 1'b1 : 1'b0,
+				`_F <=	{ /* Z */ ((`_A & tmp) == 8'b0) ? 1'b1 : 1'b0,
 					  3'b010,
 					  `_F[3:0]
 					};
 			end
 			`INSN_alu_OR: begin
 				`_A <= `_A | tmp;
-				`_F <=	{ /* Z */ ((`_A | tmp) == 0) ? 1'b1 : 1'b0,
+				`_F <=	{ /* Z */ ((`_A | tmp) == 8'b0) ? 1'b1 : 1'b0,
 					  3'b000,
 					  `_F[3:0]
 					};
 			end
 			`INSN_alu_XOR: begin
 				`_A <= `_A ^ tmp;
-				`_F <=	{ /* Z */ ((`_A ^ tmp) == 0) ? 1'b1 : 1'b0,
+				`_F <=	{ /* Z */ ((`_A ^ tmp) == 8'b0) ? 1'b1 : 1'b0,
 					  3'b000,
 					  `_F[3:0]
 					};
diff --git a/core/insn_alu_a.v b/core/insn_alu_a.v
index 14ccd76..a5e1c1c 100644
--- a/core/insn_alu_a.v
+++ b/core/insn_alu_a.v
@@ -32,7 +32,7 @@
 			`_F <= {`_F[7:5],`_A[7],`_F[3:0]};
 		end
 		`INSN_alu_RRA: begin
-			`_A <= {`_A[4],`_A[7:1]};
+			`_A <= {`_F[4],`_A[7:1]};
 			`_F <= {`_F[7:5],`_A[0],`_F[3:0]};
 		end
 		`INSN_alu_CPL: begin