exec.c: Use pow2floor() rather than hand-calculation

Use pow2floor() to round down to the nearest power of 2,
rather than an inline calculation.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1437741192-20955-5-git-send-email-peter.maydell@linaro.org

1 files changed, 1 insertions, 3 deletions

diff --git a/exec.c b/exec.c
index 54cd70a..31d2dc7 100644
--- a/exec.c
+++ b/exec.c
@@ -2374,9 +2374,7 @@ static int memory_access_size(MemoryRegion *mr, unsigned l, hwaddr addr)
     if (l > access_size_max) {
         l = access_size_max;
     }
-    if (l & (l - 1)) {
-        l = 1 << (qemu_fls(l) - 1);
-    }
+    l = pow2floor(l);
 
     return l;
 }