6995e5dae7
This patch adds the necessary infrastructure to convert instructions that take two register operands to those that take a register and immediate if the necessary operand is produced by a load-immediate. Furthermore, it uses this infrastructure to perform such conversions twice - first at MachineSSA and then pre-emit. There are a number of reasons we may end up with opportunities for this transformation, including but not limited to: - X-Form instructions chosen since the exact offset isn't available at ISEL time - Atomic instructions with constant operands (we will add patterns for this in the future) - Tail duplication may duplicate code where one block contains this redundancy - When emitting compare-free code in PPCDAGToDAGISel, we don't handle constant comparands specially Furthermore, this patch moves the initialization of PPCMIPeepholePass so that it can be used for MIR tests. llvm-svn: 320791
Low Level Virtual Machine (LLVM)
This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.