implement bclr, bclri, bexti

Author: c1570

README.md

@@ -57,9 +57,6 @@ amomin.w
 amominu.w
 amoswap.w
 amoxor.w
-bclr
-bclri
-bexti
 binv
 binvi
 brev8
@@ -134,7 +131,10 @@ auipc
 amoor.w
 beq
 beqz
+bclr
+bclri
 bext
+bexti
 bge
 bgeu
 bgez

src/riscv/cpu.ts

@@ -325,6 +325,9 @@ const opcode0x13func3Table: FuncTable<I_Type> = new Map([
     } else if (func7 === 0x14) { // bseti (Zbb)
       const result = rs1Value | ( 1 << shamt);
       registerSet.setRegister(rd, result);
+    } else if (func7 === 0x24) { // bclri (Zbs)
+      const result = rs1Value & ~(1 << shamt);
+      registerSet.setRegister(rd, result);
     } else if (immU === 0b011000000001) { // ctz (Zbb)
       let tmp = rs1Value >>> 0;
       if (tmp === 0) {
@@ -392,6 +395,10 @@ const opcode0x13func3Table: FuncTable<I_Type> = new Map([
       const result = rs1Value >> shamt;
       registerSet.setRegister(rd, result);
 
+    } else if (func7 === 0x24) { // bexti (Zbs)
+      const result = (rs1Value >>> shamt) & 1;
+      registerSet.setRegister(rd, result);
+
     } else throw Error(`Unknown instruction, func7: 0x${func7.toString(16)}`);
   }],
 
@@ -508,6 +515,10 @@ const opcode0x33func3Table: FuncTable<R_Type> = new Map([
       const index = rs2Value & 31;
       const result = rs1Value | (1 << index);
       registerSet.setRegister(rd, result);
+    } else if(func7 === 0x24) { // bclr (Zbs)
+      const index = rs2Value & 31;
+      const result = rs1Value & ~(1 << index);
+      registerSet.setRegister(rd, result);
     } else throw Error(`Unknown instruction, func7: 0x${func7.toString(16)}`);
   }],