Merged r12086, r12478 into 3.8 branch.

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index c33df5cf770842d05d73095f8ad1c2e7ce67548f..1c49876cd0feeb307afa45f8f3ec6d9deebebd7f 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -3338,23 +3338,23 @@ void TranscendentalCacheStub::Generate(MacroAssembler* masm) {
         ExternalReference(RuntimeFunction(), masm->isolate());
     __ TailCallExternalReference(runtime_function, 1, 1);
   } else {
-    if (!CpuFeatures::IsSupported(VFP3)) UNREACHABLE();
+    ASSERT(CpuFeatures::IsSupported(VFP3));
     CpuFeatures::Scope scope(VFP3);
 
     Label no_update;
     Label skip_cache;
 
     // Call C function to calculate the result and update the cache.
-    // Register r0 holds precalculated cache entry address; preserve
-    // it on the stack and pop it into register cache_entry after the
-    // call.
-    __ push(cache_entry);
+    // r0: precalculated cache entry address.
+    // r2 and r3: parts of the double value.
+    // Store r0, r2 and r3 on stack for later before calling C function.
+    __ Push(r3, r2, cache_entry);
     GenerateCallCFunction(masm, scratch0);
     __ GetCFunctionDoubleResult(d2);
 
     // Try to update the cache. If we cannot allocate a
     // heap number, we return the result without updating.
-    __ pop(cache_entry);
+    __ Pop(r3, r2, cache_entry);
     __ LoadRoot(r5, Heap::kHeapNumberMapRootIndex);
     __ AllocateHeapNumber(r6, scratch0, scratch1, r5, &no_update);
     __ vstr(d2, FieldMemOperand(r6, HeapNumber::kValueOffset));