Add POPCOUNT function (#2166)

src/asm/lexer.cpp

@@ -173,6 +173,7 @@ static UpperMap<int> const keywords{
     {"ISCONST",       T_(OP_ISCONST)       },
 
     {"BITWIDTH",      T_(OP_BITWIDTH)      },
+    {"POPCOUNT",      T_(OP_POPCOUNT)      },
     {"TZCOUNT",       T_(OP_TZCOUNT)       },
 
     {"BYTELEN",       T_(OP_BYTELEN)       },

src/asm/parser.y

@@ -286,6 +286,7 @@
 %token OP_ISCONST "ISCONST"
 %token OP_LOG "LOG"
 %token OP_LOW "LOW"
+%token OP_POPCOUNT "POPCOUNT"
 %token OP_POW "POW"
 %token OP_READFILE "READFILE"
 %token OP_REVCHAR "REVCHAR"
@@ -1396,6 +1397,9 @@ relocexpr_no_str:
 	| OP_BITWIDTH LPAREN relocexpr RPAREN {
 		$$.makeUnaryOp(RPN_BITWIDTH, std::move($3));
 	}
+	| OP_POPCOUNT LPAREN relocexpr RPAREN {
+		$$.makeUnaryOp(RPN_POPCOUNT, std::move($3));
+	}
 	| OP_TZCOUNT LPAREN relocexpr RPAREN {
 		$$.makeUnaryOp(RPN_TZCOUNT, std::move($3));
 	}

src/asm/rpn.cpp

@@ -279,6 +279,9 @@ void Expression::makeUnaryOp(RPNCommand op, Expression &&src) {
 		case RPN_TZCOUNT:
 			data = op_tzcount(val);
 			break;
+		case RPN_POPCOUNT:
+			data = op_popcount(val);
+			break;
 		// LCOV_EXCL_START
 		default:
 			// `makeUnaryOp` should never be called with a non-unary operator!

src/link/patch.cpp

@@ -182,6 +182,9 @@ static int32_t computeRPNExpr(Patch const &patch, std::vector<Symbol> const &fil
 		case RPN_TZCOUNT:
 			value = op_tzcount(popRPN(patch));
 			break;
+		case RPN_POPCOUNT:
+			value = op_popcount(popRPN(patch));
+			break;
 
 		case RPN_OR:
 			value = popRPN(patch) | popRPN(patch);

src/opmath.cpp

@@ -141,3 +141,7 @@ int32_t op_bitwidth(int32_t value) {
 int32_t op_tzcount(int32_t value) {
 	return value != 0 ? ctz(static_cast<uint32_t>(value)) : 32;
 }
+
+int32_t op_popcount(int32_t value) {
+	return popcount(static_cast<uint32_t>(value));
+}