target-alpha: Avoid gcc 6.1 werror for linux-user

Using gcc 6.1 for alpha-linux-user target we see the following build error:

.../target-alpha/translate.c: In function ‘in_superpage’:
.../target-alpha/translate.c:454:52: error: self-comparison always evaluates to true [-Werror=tautological-compare]
             && addr >> TARGET_VIRT_ADDR_SPACE_BITS == addr >> 63);

Reported-by: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-id: 1466192793-2559-1-git-send-email-rth@twiddle.net
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/target-alpha/translate.c b/target-alpha/translate.c
index 243567b..0ea0e6e 100644 (file)
--- a/target-alpha/translate.c
+++ b/target-alpha/translate.c
@@ -449,10 +449,13 @@ static ExitStatus gen_store_conditional(DisasContext *ctx, int ra, int rb,
 
 static bool in_superpage(DisasContext *ctx, int64_t addr)
 {
+#ifndef CONFIG_USER_ONLY
     return ((ctx->tb->flags & TB_FLAGS_USER_MODE) == 0
-            && addr < 0
-            && ((addr >> 41) & 3) == 2
-            && addr >> TARGET_VIRT_ADDR_SPACE_BITS == addr >> 63);
+            && addr >> TARGET_VIRT_ADDR_SPACE_BITS == -1
+            && ((addr >> 41) & 3) == 2);
+#else
+    return false;
+#endif
 }
 
 static bool use_goto_tb(DisasContext *ctx, uint64_t dest)