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Silvermont can only decode one instruction per cycle if the instruction exceeds 8 bytes. Also in Silvermont instructions with more than 3 prefixes will cause 3 cycle penalty. Maximum nop length is limited to 7 bytes when used for padding on Silvermont. For other x86 processors max nop length remains unchanged 15 bytes. Differential Revision: http://reviews.llvm.org/D4374 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212321 91177308-0d34-0410-b5e6-96231b3b80d8
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