decodetree: Fix comparison of Field

Typo comparing the sign of the field, twice, instead of also comparing
the mask of the field (which itself encodes both position and length).

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20190604154225.26992-1-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/scripts/decodetree.py b/scripts/decodetree.py
index 81874e22cc..d7a59d63ac 100755
--- a/scripts/decodetree.py
+++ b/scripts/decodetree.py
@@ -184,7 +184,7 @@ class Field:
         return '{0}(insn, {1}, {2})'.format(extr, self.pos, self.len)
 
     def __eq__(self, other):
-        return self.sign == other.sign and self.sign == other.sign
+        return self.sign == other.sign and self.mask == other.mask
 
     def __ne__(self, other):
         return not self.__eq__(other)