diff --git a/src-self-hosted/Module.zig b/src-self-hosted/Module.zig
index 0c80803fc7..f4d65ab7c0 100644
--- a/src-self-hosted/Module.zig
+++ b/src-self-hosted/Module.zig
@@ -1297,10 +1297,28 @@ fn astGenExpr(self: *Module, scope: *Scope, ast_node: *ast.Node) InnerError!*zir
         .Unreachable => return self.astGenUnreachable(scope, @fieldParentPtr(ast.Node.Unreachable, "base", ast_node)),
         .ControlFlowExpression => return self.astGenControlFlowExpression(scope, @fieldParentPtr(ast.Node.ControlFlowExpression, "base", ast_node)),
         .If => return self.astGenIf(scope, @fieldParentPtr(ast.Node.If, "base", ast_node)),
+        .InfixOp => return self.astGenInfixOp(scope, @fieldParentPtr(ast.Node.InfixOp, "base", ast_node)),
         else => return self.failNode(scope, ast_node, "TODO implement astGenExpr for {}", .{@tagName(ast_node.id)}),
     }
 }
 
+fn astGenInfixOp(self: *Module, scope: *Scope, infix_node: *ast.Node.InfixOp) InnerError!*zir.Inst {
+    switch (infix_node.op) {
+        .Add => {
+            const lhs = try self.astGenExpr(scope, infix_node.lhs);
+            const rhs = try self.astGenExpr(scope, infix_node.rhs);
+
+            const tree = scope.tree();
+            const src = tree.token_locs[infix_node.op_token].start;
+
+            return self.addZIRInst(scope, src, zir.Inst.Add, .{ .lhs = lhs, .rhs = rhs }, .{});
+        },
+        else => |op| {
+            return self.failNode(scope, &infix_node.base, "TODO implement infix operator {}", .{op});
+        },
+    }
+}
+
 fn astGenIf(self: *Module, scope: *Scope, if_node: *ast.Node.If) InnerError!*zir.Inst {
     if (if_node.payload) |payload| {
         return self.failNode(scope, payload, "TODO implement astGenIf for optionals", .{});
@@ -1496,7 +1514,12 @@ fn astGenBuiltinCall(self: *Module, scope: *Scope, call: *ast.Node.BuiltinCall)
             const arg_count: ?usize = if (positionals.fields[0].field_type == []*zir.Inst) null else positionals.fields.len;
             if (arg_count) |some| {
                 if (call.params_len != some) {
-                    return self.failTok(scope, call.builtin_token, "expected {} parameter, found {}", .{ some, call.params_len });
+                    return self.failTok(
+                        scope,
+                        call.builtin_token,
+                        "expected {} parameter{}, found {}",
+                        .{ some, if (some == 1) "" else "s", call.params_len },
+                    );
                 }
                 const params = call.params();
                 inline for (positionals.fields) |p, i| {
@@ -2902,7 +2925,9 @@ fn analyzeInstAdd(self: *Module, scope: *Scope, inst: *zir.Inst.Add) InnerError!
     const lhs = try self.resolveInst(scope, inst.positionals.lhs);
     const rhs = try self.resolveInst(scope, inst.positionals.rhs);
 
-    if (lhs.ty.zigTypeTag() == .Int and rhs.ty.zigTypeTag() == .Int) {
+    if ((lhs.ty.zigTypeTag() == .Int or lhs.ty.zigTypeTag() == .ComptimeInt) and
+        (rhs.ty.zigTypeTag() == .Int or rhs.ty.zigTypeTag() == .ComptimeInt))
+    {
         if (!lhs.ty.eql(rhs.ty)) {
             return self.fail(scope, inst.base.src, "TODO implement peer type resolution", .{});
         }
@@ -2946,8 +2971,7 @@ fn analyzeInstAdd(self: *Module, scope: *Scope, inst: *zir.Inst.Add) InnerError!
             .rhs = rhs,
         });
     }
-
-    return self.fail(scope, inst.base.src, "TODO implement more analyze add", .{});
+    return self.fail(scope, inst.base.src, "TODO analyze add for {} + {}", .{ lhs.ty.zigTypeTag(), rhs.ty.zigTypeTag() });
 }
 
 fn analyzeInstDeref(self: *Module, scope: *Scope, deref: *zir.Inst.Deref) InnerError!*Inst {
diff --git a/src-self-hosted/zir.zig b/src-self-hosted/zir.zig
index 7dceaaea1b..95548657a9 100644
--- a/src-self-hosted/zir.zig
+++ b/src-self-hosted/zir.zig
@@ -290,6 +290,7 @@ pub const Inst = struct {
 
     pub const As = struct {
         pub const base_tag = Tag.as;
+        pub const builtin_name = "@as";
         base: Inst,
 
         positionals: struct {
diff --git a/test/stage2/compare_output.zig b/test/stage2/compare_output.zig
index d49f16876e..1f2853707a 100644
--- a/test/stage2/compare_output.zig
+++ b/test/stage2/compare_output.zig
@@ -118,4 +118,29 @@ pub fn addCases(ctx: *TestContext) !void {
             \\
         );
     }
+
+    {
+        var case = ctx.exe("adding numbers", linux_x64);
+        case.addCompareOutput(
+            \\export fn _start() noreturn {
+            \\    asm volatile ("syscall"
+            \\        :
+            \\        : [number] "{rax}" (1),
+            \\          [arg1] "{rdi}" (1),
+            \\          [arg2] "{rsi}" (@ptrToInt("Hello, World!\n")),
+            \\          [arg3] "{rdx}" (10 + 4)
+            \\        : "rcx", "r11", "memory"
+            \\    );
+            \\    asm volatile ("syscall"
+            \\        :
+            \\        : [number] "{rax}" (@as(usize, 230) + @as(usize, 1)),
+            \\          [arg1] "{rdi}" (0)
+            \\        : "rcx", "r11", "memory"
+            \\    );
+            \\    unreachable;
+            \\}
+        ,
+            "Hello, World!\n",
+        );
+    }
 }