disas: nanoMIPS: Rename the decoder of 'gpr4' gpr encoding type

Rename the decoder of 'gpr4' gpr encoding type in nanoMIPS
disassembler.
Reviewed-by: NAleksandar Rikalo <arikalo@wavecomp.com>
Signed-off-by: NAleksandar Markovic <amarkovic@wavecomp.com>

disas/nanomips.cpp

@@ -406,7 +406,7 @@ uint64 NMD::encode_gpr4_zero(uint64 d)
 }
 
 
-uint64 NMD::encode_gpr4(uint64 d)
+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 };
@@ -2363,8 +2363,8 @@ std::string NMD::ADDU_4X4_(uint64 instruction)
     uint64 rt4_value = extract_rt4_9_7_6_5(instruction);
     uint64 rs4_value = extract_rs4_4_2_1_0(instruction);
 
-    std::string rs4 = GPR(encode_gpr4(rs4_value));
-    std::string rt4 = GPR(encode_gpr4(rt4_value));
+    std::string rs4 = GPR(decode_gpr_gpr4(rs4_value));
+    std::string rt4 = GPR(decode_gpr_gpr4(rt4_value));
 
     return img::format("ADDU %s, %s", rs4, rt4);
 }
@@ -9046,9 +9046,9 @@ std::string NMD::LW_4X4_(uint64 instruction)
     uint64 rs4_value = extract_rs4_4_2_1_0(instruction);
     uint64 u_value = extract_u_3_8__s2(instruction);
 
-    std::string rt4 = GPR(encode_gpr4(rt4_value));
+    std::string rt4 = GPR(decode_gpr_gpr4(rt4_value));
     std::string u = IMMEDIATE(copy(u_value));
-    std::string rs4 = GPR(encode_gpr4(rs4_value));
+    std::string rs4 = GPR(decode_gpr_gpr4(rs4_value));
 
     return img::format("LW %s, %s(%s)", rt4, u, rs4);
 }
@@ -10419,8 +10419,8 @@ std::string NMD::MOVEP_REV_(uint64 instruction)
     uint64 rd2_value = extract_rd2_3_8(instruction);
     uint64 rs4_value = extract_rs4_4_2_1_0(instruction);
 
-    std::string rs4 = GPR(encode_gpr4(rs4_value));
-    std::string rt4 = GPR(encode_gpr4(rt4_value));
+    std::string rs4 = GPR(decode_gpr_gpr4(rs4_value));
+    std::string rt4 = GPR(decode_gpr_gpr4(rt4_value));
     std::string rd2 = GPR(encode_rd2_reg1(rd2_value));
     std::string rs2 = GPR(encode_rd2_reg2(rd2_value));
     /* !!!!!!!!!! - no conversion function */
@@ -10985,8 +10985,8 @@ std::string NMD::MUL_4X4_(uint64 instruction)
     uint64 rt4_value = extract_rt4_9_7_6_5(instruction);
     uint64 rs4_value = extract_rs4_4_2_1_0(instruction);
 
-    std::string rs4 = GPR(encode_gpr4(rs4_value));
-    std::string rt4 = GPR(encode_gpr4(rt4_value));
+    std::string rs4 = GPR(decode_gpr_gpr4(rs4_value));
+    std::string rt4 = GPR(decode_gpr_gpr4(rt4_value));
 
     return img::format("MUL %s, %s", rs4, rt4);
 }
@@ -15264,7 +15264,7 @@ std::string NMD::SW_4X4_(uint64 instruction)
 
     std::string rtz4 = GPR(encode_gpr4_zero(rtz4_value));
     std::string u = IMMEDIATE(copy(u_value));
-    std::string rs4 = GPR(encode_gpr4(rs4_value));
+    std::string rs4 = GPR(decode_gpr_gpr4(rs4_value));
 
     return img::format("SW %s, %s(%s)", rtz4, u, rs4);
 }

disas/nanomips.h

@@ -109,7 +109,7 @@ private:
     uint64 decode_gpr_gpr3_src_store(uint64 d);
     uint64 encode_rd1_from_rd(uint64 d);
     uint64 encode_gpr4_zero(uint64 d);
-    uint64 encode_gpr4(uint64 d);
+    uint64 decode_gpr_gpr4(uint64 d);
     uint64 encode_rd2_reg1(uint64 d);
     uint64 encode_rd2_reg2(uint64 d);