Change hash computation for transcendental cache to use arithmetic...

src/arm/codegen-arm.cc

 // Copyright 2010 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 8286 matching lines @@
                 Heap::kHeapNumberMapRootIndex,
                 &runtime_call,
                 true);
     // Input is a HeapNumber. Load it to a double register and store the
     // low and high words into r2, r3.
     __ Ldrd(r2, r3, FieldMemOperand(r0, HeapNumber::kValueOffset));
 
     __ bind(&loaded);
     // r2 = low 32 bits of double value
     // r3 = high 32 bits of double value
-    // Compute hash:
+    // Compute hash (the shifts are arithmetic):
     //   h = (low ^ high); h ^= h >> 16; h ^= h >> 8; h = h & (cacheSize - 1);
     __ eor(r1, r2, Operand(r3));
-    __ eor(r1, r1, Operand(r1, LSR, 16));
-    __ eor(r1, r1, Operand(r1, LSR, 8));
+    __ eor(r1, r1, Operand(r1, ASR, 16));
+    __ eor(r1, r1, Operand(r1, ASR, 8));
     ASSERT(IsPowerOf2(TranscendentalCache::kCacheSize));
     __ And(r1, r1, Operand(TranscendentalCache::kCacheSize - 1));
 
     // r2 = low 32 bits of double value.
     // r3 = high 32 bits of double value.
     // r1 = TranscendentalCache::hash(double value).
     __ mov(r0,
            Operand(ExternalReference::transcendental_cache_array_address()));
     // r0 points to cache array.
     __ ldr(r0, MemOperand(r0, type_ * sizeof(TranscendentalCache::caches_[0])));
@@ skipping 2346 matching lines @@
   __ bind(&string_add_runtime);
   __ TailCallRuntime(Runtime::kStringAdd, 2, 1);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM