disas: nanoMIPS: Reorder declarations and definitions of gpr decoders

Reorder declarations and definitions of gpr decoders by number of
input bits of corresponding encoding type.

Reviewed-by: Aleksandar Rikalo <arikalo@wavecomp.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>

2 files changed, 104 insertions, 103 deletions

diff --git a/disas/nanomips.cpp b/disas/nanomips.cpp
index 23556b4..d6632bb 100644
--- a/disas/nanomips.cpp
+++ b/disas/nanomips.cpp
@@ -292,6 +292,77 @@ uint64 NMD::renumber_registers(uint64 index, uint64 *register_list,
 
 
 /*
+ * NMD::decode_gpr_gpr4() - decoder for 'gpr4' gpr encoding type
+ *
+ *   Map a 4-bit code to the 5-bit register space according to this pattern:
+ *
+ *                              1                   0
+ *                    5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
+ *                    | | | | | | | | | | | | | | | |
+ *                    | | | | | | | | | | | | | | | |
+ *                    | | | | | | | | | | | └---------------┐
+ *                    | | | | | | | | | | └---------------┐ |
+ *                    | | | | | | | | | └---------------┐ | |
+ *                    | | | | | | | | └---------------┐ | | |
+ *                    | | | | | | | |         | | | | | | | |
+ *                    | | | | | | | |         | | | | | | | |
+ *    1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
+ *      3                   2                   1                   0
+ *
+ *   Used in handling following instructions:
+ *
+ *     - ADDU[4X4]
+ *     - LW[4X4]
+ *     - MOVEP[REV]
+ *     - MUL[4X4]
+ *     - SW[4X4]
+ */
+uint64 NMD::decode_gpr_gpr4(uint64 d)
+{
+    static uint64 register_list[] = {  8,  9, 10, 11,  4,  5,  6,  7,
+                                      16, 17, 18, 19, 20, 21, 22, 23 };
+    return renumber_registers(d, register_list,
+               sizeof(register_list) / sizeof(register_list[0]));
+}
+
+
+/*
+ * NMD::decode_gpr_gpr4_zero() - decoder for 'gpr4.zero' gpr encoding type
+ *
+ *   Map a 4-bit code to the 5-bit register space according to this pattern:
+ *
+ *                              1                   0
+ *                    5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
+ *                    | | | | | | | | | | | | | | | |
+ *                    | | | | | | | | | | | | └---------------------┐
+ *                    | | | | | | | | | | | └---------------┐       |
+ *                    | | | | | | | | | | └---------------┐ |       |
+ *                    | | | | | | | | | └---------------┐ | |       |
+ *                    | | | | | | | | └---------------┐ | | |       |
+ *                    | | | | | | | |           | | | | | | |       |
+ *                    | | | | | | | |           | | | | | | |       |
+ *    1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
+ *      3                   2                   1                   0
+ *
+ *   This pattern is the same one used for 'gpr4' gpr encoding type, except for
+ * the input value 3, that is mapped to the output value 0 instead of 11.
+ *
+ *   Used in handling following instructions:
+ *
+ *     - MOVE.BALC
+ *     - MOVEP
+ *     - SW[4X4]
+ */
+uint64 NMD::decode_gpr_gpr4_zero(uint64 d)
+{
+    static uint64 register_list[] = {  8,  9, 10,  0,  4,  5,  6,  7,
+                                      16, 17, 18, 19, 20, 21, 22, 23 };
+    return renumber_registers(d, register_list,
+               sizeof(register_list) / sizeof(register_list[0]));
+}
+
+
+/*
  * NMD::decode_gpr_gpr3() - decoder for 'gpr3' gpr encoding type
  *
  *   Map a 3-bit code to the 5-bit register space according to this pattern:
@@ -390,106 +461,6 @@ uint64 NMD::decode_gpr_gpr3_src_store(uint64 d)
 
 
 /*
- * NMD::decode_gpr_gpr1() - decoder for 'gpr1' gpr encoding type
- *
- *   Map a 1-bit code to the 5-bit register space according to this pattern:
- *
- *                                  1 0
- *                                  | |
- *                                  | |
- *                                  | └---------------------┐
- *                                  └---------------------┐ |
- *                                                        | |
- *                                                        | |
- *                                                        | |
- *                                                        | |
- *    1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
- *      3                   2                   1                   0
- *
- *   Used in handling following instruction:
- *
- *     - MOVE.BALC
- */
-uint64 NMD::decode_gpr_gpr1(uint64 d)
-{
-    static uint64 register_list[] = {  4,  5 };
-    return renumber_registers(d, register_list,
-               sizeof(register_list) / sizeof(register_list[0]));
-}
-
-
-/*
- * NMD::decode_gpr_gpr4_zero() - decoder for 'gpr4.zero' gpr encoding type
- *
- *   Map a 4-bit code to the 5-bit register space according to this pattern:
- *
- *                              1                   0
- *                    5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
- *                    | | | | | | | | | | | | | | | |
- *                    | | | | | | | | | | | | └---------------------┐
- *                    | | | | | | | | | | | └---------------┐       |
- *                    | | | | | | | | | | └---------------┐ |       |
- *                    | | | | | | | | | └---------------┐ | |       |
- *                    | | | | | | | | └---------------┐ | | |       |
- *                    | | | | | | | |           | | | | | | |       |
- *                    | | | | | | | |           | | | | | | |       |
- *    1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
- *      3                   2                   1                   0
- *
- *   This pattern is the same one used for 'gpr4' gpr encoding type, except for
- * the input value 3, that is mapped to the output value 0 instead of 11.
- *
- *   Used in handling following instructions:
- *
- *     - MOVE.BALC
- *     - MOVEP
- *     - SW[4X4]
- */
-uint64 NMD::decode_gpr_gpr4_zero(uint64 d)
-{
-    static uint64 register_list[] = {  8,  9, 10,  0,  4,  5,  6,  7,
-                                      16, 17, 18, 19, 20, 21, 22, 23 };
-    return renumber_registers(d, register_list,
-               sizeof(register_list) / sizeof(register_list[0]));
-}
-
-
-/*
- * NMD::decode_gpr_gpr4() - decoder for 'gpr4' gpr encoding type
- *
- *   Map a 4-bit code to the 5-bit register space according to this pattern:
- *
- *                              1                   0
- *                    5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
- *                    | | | | | | | | | | | | | | | |
- *                    | | | | | | | | | | | | | | | |
- *                    | | | | | | | | | | | └---------------┐
- *                    | | | | | | | | | | └---------------┐ |
- *                    | | | | | | | | | └---------------┐ | |
- *                    | | | | | | | | └---------------┐ | | |
- *                    | | | | | | | |         | | | | | | | |
- *                    | | | | | | | |         | | | | | | | |
- *    1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
- *      3                   2                   1                   0
- *
- *   Used in handling following instructions:
- *
- *     - ADDU[4X4]
- *     - LW[4X4]
- *     - MOVEP[REV]
- *     - MUL[4X4]
- *     - SW[4X4]
- */
-uint64 NMD::decode_gpr_gpr4(uint64 d)
-{
-    static uint64 register_list[] = {  8,  9, 10, 11,  4,  5,  6,  7,
-                                      16, 17, 18, 19, 20, 21, 22, 23 };
-    return renumber_registers(d, register_list,
-               sizeof(register_list) / sizeof(register_list[0]));
-}
-
-
-/*
  * NMD::decode_gpr_gpr2_reg1() - decoder for 'gpr2.reg1' gpr encoding type
  *
  *   Map a 2-bit code to the 5-bit register space according to this pattern:
@@ -549,6 +520,35 @@ uint64 NMD::decode_gpr_gpr2_reg2(uint64 d)
 }
 
 
+/*
+ * NMD::decode_gpr_gpr1() - decoder for 'gpr1' gpr encoding type
+ *
+ *   Map a 1-bit code to the 5-bit register space according to this pattern:
+ *
+ *                                  1 0
+ *                                  | |
+ *                                  | |
+ *                                  | └---------------------┐
+ *                                  └---------------------┐ |
+ *                                                        | |
+ *                                                        | |
+ *                                                        | |
+ *                                                        | |
+ *    1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
+ *      3                   2                   1                   0
+ *
+ *   Used in handling following instruction:
+ *
+ *     - MOVE.BALC
+ */
+uint64 NMD::decode_gpr_gpr1(uint64 d)
+{
+    static uint64 register_list[] = {  4,  5 };
+    return renumber_registers(d, register_list,
+               sizeof(register_list) / sizeof(register_list[0]));
+}
+
+
 uint64 NMD::copy(uint64 d)
 {
     return d;
diff --git a/disas/nanomips.h b/disas/nanomips.h
index d6a6e3f..6482eda 100644
--- a/disas/nanomips.h
+++ b/disas/nanomips.h
@@ -105,13 +105,14 @@ private:
 
     uint64 renumber_registers(uint64 index, uint64 *register_list,
                               size_t register_list_size);
+
+    uint64 decode_gpr_gpr4(uint64 d);
+    uint64 decode_gpr_gpr4_zero(uint64 d);
     uint64 decode_gpr_gpr3(uint64 d);
     uint64 decode_gpr_gpr3_src_store(uint64 d);
-    uint64 decode_gpr_gpr1(uint64 d);
-    uint64 decode_gpr_gpr4_zero(uint64 d);
-    uint64 decode_gpr_gpr4(uint64 d);
     uint64 decode_gpr_gpr2_reg1(uint64 d);
     uint64 decode_gpr_gpr2_reg2(uint64 d);
+    uint64 decode_gpr_gpr1(uint64 d);
 
     uint64 copy(uint64 d);
     int64 copy(int64 d);