commit 6142addcff4f2b3b588ad488f377ac8dcd7326f9
author Yaowu Xu <yaowu@yaowu-macbookpro.roam.corp.google.com> Sat Mar 03 10:30:50 2018 -0800
committer Yaowu Xu <yaowu@google.com> Sun Mar 04 01:00:54 2018 +0000
tree 235563599596e8f4ee3c2a213a4f159a45af2a00
parent 4138740bd5dc75ecdcf656f3d477e7af4c30ca2a

Add error checking to avoid invalid clamp

Change-Id: I427b78588aaa6836744f385b03151723374b8d0e

av1/common/av1_inv_txfm1d.h

diff --git a/av1/common/av1_inv_txfm1d.h b/av1/common/av1_inv_txfm1d.h
index 6a4c07c..efc80c4 100644
--- a/av1/common/av1_inv_txfm1d.h
+++ b/av1/common/av1_inv_txfm1d.h
@@ -19,6 +19,7 @@
 #endif
 
 static INLINE int32_t clamp_value(int32_t value, int8_t bit) {
+  if (bit <= 0) return value;  // Do nothing for invalid clamp bit.
   const int64_t max_value = (1LL << (bit - 1)) - 1;
   const int64_t min_value = -(1LL << (bit - 1));
   return (int32_t)clamp64(value, min_value, max_value);