Evan Cheng
7e66c0d43a
Find loop back edges only after empty blocks are eliminated.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61752 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-05 21:17:27 +00:00
Evan Cheng
ab63152871
- CodeGenPrepare does not split loop back edges but it only knows about back edges of single block loops. It now does a DFS walk to find loop back edges.
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- Use SplitBlockPredecessors to factor out common predecessors of the critical edge destination. This is disabled for now due to some regressions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61248 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-19 18:03:11 +00:00
Chris Lattner
6d235bb7a0
fix an over-reduced test.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60067 91177308-0d34-0410-b5e6-96231b3b80d8
2008-11-26 00:12:08 +00:00
Evan Cheng
9ef4ca2e81
If it's determined safe, remat MOV32r0 (i.e. xor r, r) and others as it is instead of using the longer MOV32ri instruction.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52670 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-24 07:10:51 +00:00
