diff --git a/src/arch/sparcv9/CodeGen.zig b/src/arch/sparcv9/CodeGen.zig
index de7c786096..7de035bc5c 100644
--- a/src/arch/sparcv9/CodeGen.zig
+++ b/src/arch/sparcv9/CodeGen.zig
@@ -475,6 +475,7 @@ fn genBody(self: *Self, body: []const Air.Inst.Index) InnerError!void {
             .cmp_gt  => @panic("TODO try self.airCmp(inst, .gt)"),
             .cmp_neq => @panic("TODO try self.airCmp(inst, .neq)"),
             .cmp_vector => @panic("TODO try self.airCmpVector(inst)"),
+            .cmp_lt_errors_len => @panic("TODO try self.airCmpLtErrorsLen(inst)"),
 
             .bool_and        => @panic("TODO try self.airBoolOp(inst)"),
             .bool_or         => @panic("TODO try self.airBoolOp(inst)"),
@@ -647,10 +648,12 @@ fn airAsm(self: *Self, inst: Air.Inst.Index) !void {
         } else null;
 
         for (inputs) |input| {
-            const constraint = std.mem.sliceTo(std.mem.sliceAsBytes(self.air.extra[extra_i..]), 0);
+            const input_bytes = std.mem.sliceAsBytes(self.air.extra[extra_i..]);
+            const constraint = std.mem.sliceTo(input_bytes, 0);
+            const input_name = std.mem.sliceTo(input_bytes[constraint.len + 1 ..], 0);
             // This equation accounts for the fact that even if we have exactly 4 bytes
             // for the string, we still use the next u32 for the null terminator.
-            extra_i += constraint.len / 4 + 1;
+            extra_i += (constraint.len + input_name.len + 1) / 4 + 1;
 
             if (constraint.len < 3 or constraint[0] != '{' or constraint[constraint.len - 1] != '}') {
                 return self.fail("unrecognized asm input constraint: '{s}'", .{constraint});