Subzero: Use the memset inline threshold for memset.

src/IceTargetLoweringX8664Traits.h

 //===- subzero/src/IceTargetLoweringX8664Traits.h - x86-64 traits -*- C++ -*-=//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 744 matching lines @@
   static const uint32_t X86_STACK_ALIGNMENT_BYTES;
   /// Size of the return address on the stack
   static constexpr uint32_t X86_RET_IP_SIZE_BYTES = 8;
   /// The number of different NOP instructions
   static constexpr uint32_t X86_NUM_NOP_VARIANTS = 5;
 
   /// \name Limits for unrolling memory intrinsics.
   /// @{
   static constexpr uint32_t MEMCPY_UNROLL_LIMIT = 8;
   static constexpr uint32_t MEMMOVE_UNROLL_LIMIT = 8;
-  static constexpr uint32_t MEMSET_UNROLL_LIMIT = 16;
+  static constexpr uint32_t MEMSET_UNROLL_LIMIT = 8;
   /// @}
 
   /// Value is in bytes. Return Value adjusted to the next highest multiple of
   /// the stack alignment.
   static uint32_t applyStackAlignment(uint32_t Value) {
     return Utils::applyAlignment(Value, X86_STACK_ALIGNMENT_BYTES);
   }
 
   /// Return the type which the elements of the vector have in the X86
   /// representation of the vector.
@@ skipping 225 matching lines @@
     const char *FldString;    // s, l, or <blank>
   } TypeAttributes[];
 };
 
 using Traits = ::Ice::X8664::TargetX8664Traits;
 } // end of namespace X8664
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX8664TRAITS_H