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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 llvm-svn: 212321
Low Level Virtual Machine (LLVM) ================================ This directory and its subdirectories contain source code for the Low Level Virtual Machine, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the documentation provided in docs/ for further assistance with LLVM, and in particular docs/GettingStarted.rst for getting started with LLVM and docs/README.txt for an overview of LLVM's documentation setup. If you're writing a package for LLVM, see docs/Packaging.rst for our suggestions.