v8: upgrade to 3.20.17

[platform/upstream/nodejs.git] / deps / v8 / src / ia32 / stub-cache-ia32.cc

diff --git a/deps/v8/src/ia32/stub-cache-ia32.cc b/deps/v8/src/ia32/stub-cache-ia32.cc
index b7828b8..df7ad44 100644 (file)
--- a/deps/v8/src/ia32/stub-cache-ia32.cc
+++ b/deps/v8/src/ia32/stub-cache-ia32.cc
@@ -2479,6 +2479,8 @@ Handle<Code> CallStubCompiler::CompileMathAbsCall(
   STATIC_ASSERT(kSmiTag == 0);
   __ JumpIfNotSmi(eax, &not_smi);
 
+  // Branchless abs implementation, refer to below:
+  // http://graphics.stanford.edu/~seander/bithacks.html#IntegerAbs
   // Set ebx to 1...1 (== -1) if the argument is negative, or to 0...0
   // otherwise.
   __ mov(ebx, eax);