fix #5

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "customasm"
-version = "0.9.1"
+version = "0.9.2"
 authors = ["Henrique Lorenzi <[email protected]>"]
 
 [lib]

src/expr/eval.rs

@@ -384,10 +384,10 @@ where F: Fn(u8, u8) -> u8
 	let mut rhs_bytes = rhs.to_signed_bytes_le();
 	let mut rhs_sign = rhs.sign();
 
-	if lhs_sign != Sign::Minus && (lhs_bytes[0] & 0x80) != 0
+	if lhs_sign != Sign::Minus
 		{ lhs_bytes.push(0); }
 
-	if rhs_sign != Sign::Minus && (rhs_bytes[0] & 0x80) != 0
+	if rhs_sign != Sign::Minus
 		{ rhs_bytes.push(0); }
 
 	if rhs_bytes.len() > lhs_bytes.len()

src/test/expr.rs

@@ -241,6 +241,10 @@ fn test_ops_concat()
 	test("4'0x0 @ 4'0x0 @ 4'0x8 @ 4'0x9", Pass(ExpressionValue::Integer(BigInt::from(0x89))));
 	test("0x1 @ (4'0x0 @ 4'0x0 @ 4'0x8 @ 4'0x9)", Pass(ExpressionValue::Integer(BigInt::from(0x10089))));
 
+	test("0x0 @ 0x8000[19:0]", Pass(ExpressionValue::Integer(BigInt::from(0x8000))));
+	test("0x1 @ 0x8000[19:0]", Pass(ExpressionValue::Integer(BigInt::from(0x108000))));
+	test("0x1 @ 0x9000[19:0]", Pass(ExpressionValue::Integer(BigInt::from(0x109000))));
+
 	test("  0 @   0", Fail(("test", 1, "known width")));
 	test("8'0 @   0", Fail(("test", 1, "known width")));
 	test("  0 @ 8'0", Fail(("test", 1, "known width")));