C++11 does not allow narrowing a constant expression value to a type that can't fully represent it. So when char is considered unsigned, we can't store -1 in it. Explicitly using signed char fixes it. Change-Id: I5c0e9fe0025659e06291655a12220ab589d5f5bd Reviewed-on: https://swiftshader-review.googlesource.com/9630Reviewed-by: Corentin Wallez <cwallez@google.com> Reviewed-by: Nicolas Capens <capn@google.com> Tested-by: Nicolas Capens <capn@google.com>
