Fix push of untagged value in type-recording unary op stub.

src/ia32/code-stubs-ia32.cc

 // Copyright 2011 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 728 matching lines @@
 
   // Tag the result as a smi and we're done.
   STATIC_ASSERT(kSmiTagSize == 1);
   __ lea(eax, Operand(ecx, times_2, kSmiTag));
   __ ret(0);
 
   // Try to store the result in a heap number.
   __ bind(&try_float);
   if (mode_ == UNARY_NO_OVERWRITE) {
     Label slow_allocate_heapnumber, heapnumber_allocated;
+    __ mov(ebx, eax);
     __ AllocateHeapNumber(eax, edx, edi, &slow_allocate_heapnumber);
     __ jmp(&heapnumber_allocated);
 
     __ bind(&slow_allocate_heapnumber);
     __ EnterInternalFrame();
-    __ push(ecx);
+    // Push the original HeapNumber on the stack. The integer value can't
+    // be stored since it's untagged and not in the smi range (so we can't
+    // smi-tag it). We'll recalculate the value after the GC instead.
+    __ push(ebx);
     __ CallRuntime(Runtime::kNumberAlloc, 0);
-    __ pop(ecx);
+    // New HeapNumber is in eax.
+    __ pop(edx);
     __ LeaveInternalFrame();
+    // IntegerConvert uses ebx and edi as scratch registers.
+    // This conversion won't go slow-case.
+    IntegerConvert(masm, edx, CpuFeatures::IsSupported(SSE3), slow);
+    __ not_(ecx);
 
     __ bind(&heapnumber_allocated);
   }
   if (CpuFeatures::IsSupported(SSE2)) {
     CpuFeatures::Scope use_sse2(SSE2);
     __ cvtsi2sd(xmm0, Operand(ecx));
     __ movdbl(FieldOperand(eax, HeapNumber::kValueOffset), xmm0);
   } else {
     __ push(ecx);
     __ fild_s(Operand(esp, 0));
@@ skipping 5384 matching lines @@
   __ Drop(1);
   __ ret(2 * kPointerSize);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32