Dan Gohman 3b46030375 Pool-allocation for MachineInstrs, MachineBasicBlocks, and ...

MachineMemOperands. The pools are owned by MachineFunctions.

This drastically reduces the number of calls to malloc/free made
during the "Emit" phase of scheduling, as well as later phases
in CodeGen. Combined with other changes, this speeds up the
"instruction selection" phase of CodeGen by 10% in some cases.

llvm-svn: 53212

2008-07-07 23:14:23 +00:00

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