[wasm] Backoff implementation for F64Trunc using std::trunc.

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 16 matching lines @@
 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // The original source code covered by the above license above has been
 // modified significantly by Google Inc.
 // Copyright 2012 the V8 project authors. All rights reserved.
 
 #include "src/assembler.h"
 
+#include <math.h>
 #include <cmath>
 #include "src/api.h"
 #include "src/base/cpu.h"
 #include "src/base/functional.h"
 #include "src/base/lazy-instance.h"
 #include "src/base/platform/platform.h"
 #include "src/base/utils/random-number-generator.h"
 #include "src/builtins.h"
 #include "src/codegen.h"
 #include "src/counters.h"
@@ skipping 1077 matching lines @@
       Redirect(isolate, FUNCTION_ADDR(Deoptimizer::New)));
 }
 
 
 ExternalReference ExternalReference::compute_output_frames_function(
     Isolate* isolate) {
   return ExternalReference(
       Redirect(isolate, FUNCTION_ADDR(Deoptimizer::ComputeOutputFrames)));
 }
 
+static void trunc64_wrapper(double* param) { *param = trunc(*param); }

[ahaas, 2016/02/01 12:04:02]

std::trunc caused problems on android.

+
+ExternalReference ExternalReference::trunc64_wrapper_function(
+    Isolate* isolate) {
+  return ExternalReference(Redirect(isolate, FUNCTION_ADDR(trunc64_wrapper)));
+}
 
 ExternalReference ExternalReference::log_enter_external_function(
     Isolate* isolate) {
   return ExternalReference(
       Redirect(isolate, FUNCTION_ADDR(Logger::EnterExternal)));
 }
 
 
 ExternalReference ExternalReference::log_leave_external_function(
     Isolate* isolate) {
@@ skipping 721 matching lines @@
 
 
 void Assembler::DataAlign(int m) {
   DCHECK(m >= 2 && base::bits::IsPowerOfTwo32(m));
   while ((pc_offset() & (m - 1)) != 0) {
     db(0);
   }
 }
 }  // namespace internal
 }  // namespace v8