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

src/ia32/codegen-ia32.cc

Index: src/ia32/codegen-ia32.cc
===================================================================
--- src/ia32/codegen-ia32.cc	(revision 4871)
+++ src/ia32/codegen-ia32.cc	(working copy)
@@ -10293,15 +10293,15 @@
   // ST[0] == double value
   // ebx = low 32 bits of double value
   // edx = 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);
   __ mov(ecx, ebx);
   __ xor_(ecx, Operand(edx));
   __ mov(eax, ecx);
-  __ shr(eax, 16);
+  __ sar(eax, 16);
   __ xor_(ecx, Operand(eax));
   __ mov(eax, ecx);
-  __ shr(eax, 8);
+  __ sar(eax, 8);
   __ xor_(ecx, Operand(eax));
   ASSERT(IsPowerOf2(TranscendentalCache::kCacheSize));
   __ and_(Operand(ecx), Immediate(TranscendentalCache::kCacheSize - 1));