commit 532d6f09b1e7bfe995c1dba6594d1fc2c1ea77cf
author Nick Kralevich <nnk@google.com> Thu May 02 14:31:51 2013 -0700
committer Nick Kralevich <nnk@google.com> Thu May 02 14:31:51 2013 -0700
tree b44f5c27070a9284e33a24b7ddc099c3140af827
parent e4ac8feb58ed1f963db9a1f32fa74a06a1f594f2

Use __predict_false on some fortify methods.

Give the compiler some hints that these error conditions
are unlikely to occur in practice.

Change-Id: Ifaf7322a12120ef663c8315c1a18c2dcbe4bda23

libc/bionic/__vsnprintf_chk.cpp

diff --git a/libc/bionic/__vsnprintf_chk.cpp b/libc/bionic/__vsnprintf_chk.cpp
index 0fdda3e..2d3a81e 100644
--- a/libc/bionic/__vsnprintf_chk.cpp
+++ b/libc/bionic/__vsnprintf_chk.cpp
@@ -50,7 +50,7 @@
         const char *format,
         va_list va)
 {
-    if (supplied_size > dest_len_from_compiler) {
+    if (__predict_false(supplied_size > dest_len_from_compiler)) {
         __fortify_chk_fail("vsnprintf buffer overflow", 0);
     }