PPC: Disable gcc generation of fmadd/fmsub in cctests.

test/cctest/cctest.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 261 matching lines @@
           'sources': [
             'test-platform-win32.cc',
           ],
           'msvs_settings': {
             'VCCLCompilerTool': {
               # MSVS wants this for gay-{precision,shortest}.cc.
               'AdditionalOptions': ['/bigobj'],
             },
           },
         }],
+        ['v8_target_arch=="ppc" or v8_target_arch=="ppc64"', {
+          # disable fmadd/fmsub so that expected results match generated code in
+          # RunFloat64MulAndFloat64Add1 and friends.
+          'cflags': ['-ffp-contract=off'],
+        }],
         ['OS=="aix"', {
           'ldflags': [ '-Wl,-bbigtoc' ],
         }],
         ['component=="shared_library"', {
           # cctest can't be built against a shared library, so we need to
           # depend on the underlying static target in that case.
           'dependencies': ['../../tools/gyp/v8.gyp:v8_maybe_snapshot'],
         }, {
           'dependencies': ['../../tools/gyp/v8.gyp:v8'],
         }],
@@ skipping 53 matching lines @@
             '../../build/isolate.gypi',
           ],
           'sources': [
             'cctest.isolate',
           ],
         },
       ],
     }],
   ],
 }