add signed mul and div instrs

Author: vytdev

impl.h

@@ -113,4 +113,30 @@ DEF(modi) {
   vmnext;
 }
 
+DEF(muls) {
+  rgA = (rvm_i64)rgB * (rvm_i64)rgC;
+  vmnext;
+}
+
+DEF(mulsi) {
+  rgA = (rvm_i64)rgB * (rvm_i64)imm15s;
+  vmnext;
+}
+
+DEF(divs) {
+  if (rgC == 0) {
+    vmbrk -RVM_EDIVZ;
+  }
+  rgA = (rvm_i64)rgB / (rvm_i64)rgC;
+  vmnext;
+}
+
+DEF(divsi) {
+  if (imm15u == 0) {
+    vmbrk -RVM_EDIVZ;
+  }
+  rgA = (rvm_i64)rgB / (rvm_i64)imm15s;
+  vmnext;
+}
+
 #endif /* impl.h */

opcodes.h

@@ -41,5 +41,9 @@ DEF(div,    19)   /* [R] rgA = rgB / rgC */
 DEF(divi,   20)   /* [I] rgA = rgB / zxt(func15) */
 DEF(mod,    21)   /* [R] rgA = rgB % rgC */
 DEF(modi,   22)   /* [I] rgA = rgB % zxt(func15) */
+DEF(muls,   23)   /* [R] rgA = s(rgB) * s(rgC) */
+DEF(mulsi,  24)   /* [I] rgA = s(rgB) * sxt(func15) */
+DEF(divs,   25)   /* [R] rgA = s(rgB) / s(rgC) */
+DEF(divsi,  26)   /* [I] rgA = s(rgB) / sxt(func15) */
 
 #endif /* opcodes.h */