diff --git a/src/compiler/isaspec/isa.py b/src/compiler/isaspec/isa.py
index dda0b7c84b0..e208e776ecb 100644
--- a/src/compiler/isaspec/isa.py
+++ b/src/compiler/isaspec/isa.py
@@ -561,7 +561,7 @@ class ISA(object):
 
         # Validate that all bitset fields have valid types, and in
         # the case of bitset type, the sizes match:
-        builtin_types = ['branch', 'absbranch', 'int', 'uint', 'hex', 'offset', 'uoffset', 'float', 'bool', 'enum', 'custom']
+        builtin_types = ['branch', 'absbranch', 'int', 'uint', 'hex', 'offset', 'uoffset', 'float', 'bool', 'bool_inv', 'enum', 'custom']
         for bitset_name, bitset in self.bitsets.items():
             if bitset.extends is not None:
                 assert bitset.extends in self.bitsets, "{} extends invalid type: {}".format(
diff --git a/src/compiler/isaspec/isaspec_decode_decl.h b/src/compiler/isaspec/isaspec_decode_decl.h
index 1c6794c4d37..968163e7212 100644
--- a/src/compiler/isaspec/isaspec_decode_decl.h
+++ b/src/compiler/isaspec/isaspec_decode_decl.h
@@ -102,6 +102,7 @@ struct isa_field {
 		TYPE_UOFFSET,  /* Like UINT but formated with + or omitted if ==0 */
 		TYPE_FLOAT,
 		TYPE_BOOL,
+		TYPE_BOOL_INV, /* Like BOOL but inverted */
 		TYPE_ENUM,
 
 		/* For fields that must be printed via a user-provided callback */
diff --git a/src/compiler/isaspec/isaspec_decode_impl.c b/src/compiler/isaspec/isaspec_decode_impl.c
index 61bbd971eb7..5a7afc94c90 100644
--- a/src/compiler/isaspec/isaspec_decode_impl.c
+++ b/src/compiler/isaspec/isaspec_decode_impl.c
@@ -686,6 +686,16 @@ display_field(struct decode_scope *scope, const char *field_name)
 			isa_print(print, "%u", (unsigned)val);
 		}
 		break;
+	case TYPE_BOOL_INV: {
+		if (field->display) {
+			if (!val) {
+				isa_print(print, "%s", field->display);
+			}
+		} else {
+			isa_print(print, "%u", (unsigned)!val);
+		}
+		break;
+	}
 	case TYPE_ENUM:
 		display_enum_field(scope, field, v);
 		break;