llvm/test/CodeGen/X86/code_placement.ll, branch release_27

Eliminate uses of %prcontext.

2009-09-05T11:35:16Z

- I'd appreciate it if someone else eyeballs my changes to make sure I captured the intent of the test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81083 91177308-0d34-0410-b5e6-96231b3b80d8

Enable loop bb placement optimization.

2009-05-08T23:35:49Z

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71291 91177308-0d34-0410-b5e6-96231b3b80d8

Optimize code placement in loop to eliminate unconditional branches or move unconditional branch to the outside of the loop. e.g.

2009-05-08T06:34:09Z

/// A: /// ... /// /// /// B: --> loop header /// ... /// jcc C, [exit] /// /// C: /// ... /// jmp B /// /// ==> /// /// A: /// ... /// jmp B /// /// C: --> new loop header /// ... /// /// /// B: /// ... /// jcc C, [exit] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71209 91177308-0d34-0410-b5e6-96231b3b80d8