[RV64_DYNAREC] Added more opcodes and some fixes (#619)

* [RV64_DYNAREC] Fixed SUB opcode

* [RV64_DYNAREC] Added F6 /4 MUL opcode

* [RV64_DYNAREC] Added 66 21 AND opcode

3 files changed, 31 insertions, 12 deletions

diff --git a/src/dynarec/rv64/dynarec_rv64_00.c b/src/dynarec/rv64/dynarec_rv64_00.c
index 630666e7..98d5439f 100644
--- a/src/dynarec/rv64/dynarec_rv64_00.c
+++ b/src/dynarec/rv64/dynarec_rv64_00.c
@@ -1262,6 +1262,20 @@ uintptr_t dynarec64_00(dynarec_rv64_t* dyn, uintptr_t addr, uintptr_t ip, int ni
                     MOV32w(x2, u8);
                     emit_test8(dyn, ninst, x1, x2, x3, x4, x5);
                     break;
+                case 4:
+                    INST_NAME("MUL AL, Ed");
+                    SETFLAGS(X_ALL, SF_PENDING);
+                    UFLAG_DF(x1, d_mul8);
+                    GETEB(x1, 0);
+                    ANDI(x2, xRAX, 0xff);
+                    MULW(x1, x2, x1);
+                    UFLAG_RES(x1);
+                    LUI(x2, 0xffff0);
+                    AND(xRAX, xRAX, x2);
+                    SLLI(x1, x1, 48);
+                    SRLI(x1, x1, 48);
+                    OR(xRAX, xRAX, x1);
+                    break;
                 default:
                     DEFAULT;
             }
diff --git a/src/dynarec/rv64/dynarec_rv64_66.c b/src/dynarec/rv64/dynarec_rv64_66.c
index cef86d4d..222cb60c 100644
--- a/src/dynarec/rv64/dynarec_rv64_66.c
+++ b/src/dynarec/rv64/dynarec_rv64_66.c
@@ -65,6 +65,15 @@ uintptr_t dynarec64_66(dynarec_rv64_t* dyn, uintptr_t addr, uintptr_t ip, int ni
         case 0x0F:
             addr = dynarec64_660F(dyn, addr, ip, ninst, rex, ok, need_epilog);
             break;
+        case 0x21:
+            INST_NAME("AND Ew, Gw");
+            SETFLAGS(X_ALL, SF_SET_PENDING);
+            nextop = F8;
+            GETGW(x2);
+            GETEW(x1, 0);
+            emit_and16(dyn, ninst, x1, x2, x4, x5);
+            EWBACK;
+            break;
         case 0x25:
             INST_NAME("AND AX, Iw");
             SETFLAGS(X_ALL, SF_SET_PENDING);
diff --git a/src/dynarec/rv64/dynarec_rv64_emit_math.c b/src/dynarec/rv64/dynarec_rv64_emit_math.c
index 91cece12..7d8ed89a 100644
--- a/src/dynarec/rv64/dynarec_rv64_emit_math.c
+++ b/src/dynarec/rv64/dynarec_rv64_emit_math.c
@@ -321,10 +321,7 @@ void emit_sub8c(dynarec_rv64_t* dyn, int ninst, int s1, int c, int s2, int s3, i
 {
     CLEAR_FLAGS();
 
-    IFX(X_ALL|X_PEND) {
-        MOV32w(s5, c&0xff);
-    }
-
+    MOV32w(s5, c&0xff);
     IFX(X_PEND) {
         SB(s1, xEmu, offsetof(x64emu_t, op1));
         SB(s5, xEmu, offsetof(x64emu_t, op2));
@@ -335,20 +332,19 @@ void emit_sub8c(dynarec_rv64_t* dyn, int ninst, int s1, int c, int s2, int s3, i
 
     IFX(X_AF | X_CF | X_OF) {
         // for later flag calculation
-        NOT(s5, s1);
+        NOT(s2, s1);
     }
 
-    SUBW(s1, s1, s3);
-    ANDI(s1, s1, 0xff);
-
-    IFX(X_PEND) {
-        SB(s1, xEmu, offsetof(x64emu_t, res));
-    }
+    SUB(s1, s1, s5);
     IFX(X_SF) {
         BGE(s1, xZR, 8);
         ORI(xFlags, xFlags, 1 << F_SF);
     }
-    CALC_SUB_FLAGS(s5, s2, s1, s3, s4, 8);
+    ANDI(s1, s1, 0xff);
+    IFX(X_PEND) {
+        SB(s1, xEmu, offsetof(x64emu_t, res));
+    }
+    CALC_SUB_FLAGS(s2, s5, s1, s3, s4, 8);
     IFX(X_ZF) {
         BNEZ(s1, 8);
         ORI(xFlags, xFlags, 1 << F_ZF);