Contribution of PowerPC port (continuation of 422063005) - AIX Common1

src/codegen.cc

Index: src/codegen.cc
diff --git a/src/codegen.cc b/src/codegen.cc
index 627e8362e67c551641174d7b161d45b27bb7761d..5193843407fa22e3b7e96532c86bf5cec342c709 100644
--- a/src/codegen.cc
+++ b/src/codegen.cc
@@ -2,6 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#if defined(_AIX)
+#include <fenv.h>
+#endif
+
 #include "src/v8.h"
 
 #include "src/bootstrapper.h"
@@ -48,7 +52,17 @@ double modulo(double x, double y) {
 #else  // POSIX
 
 double modulo(double x, double y) {
+#if defined(_AIX)
+  // AIX raises an underflow exception for (Number.MIN_VALUE % Number.MAX_VALUE)
+  double result;

[Sven Panne, 2015/01/27 11:47:05]

Don't use a declaration without initialization here and below, we're in C++
land.

[michael_dawson, 2015/01/29 00:08:29]

Will do 

+  int exception;
+  feclearexcept(FE_ALL_EXCEPT);
+  result = std::fmod(x, y);
+  exception = fetestexcept(FE_UNDERFLOW);
+  return (exception ? x : result);
+#else
   return std::fmod(x, y);
+#endif
 }
 #endif  // defined(_WIN64)