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* Don't update physical register def.Evan Cheng2010-03-061-2/+3
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97861 91177308-0d34-0410-b5e6-96231b3b80d8
* Avoid cse load instructions unless they are known to be invariant loads.Evan Cheng2010-03-041-10/+36
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97747 91177308-0d34-0410-b5e6-96231b3b80d8
* Look ahead a bit to determine if a physical register def that is not marked ↵Evan Cheng2010-03-041-6/+61
| | | | | | dead is really alive. This is necessary to catch a lot of common cse opportunities for targets like x86. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97706 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix a logic error. An instruction that has a live physical register def ↵Evan Cheng2010-03-031-2/+5
| | | | | | cannot be CSE'ed, but it *can* be used to replace a common subexpression. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97688 91177308-0d34-0410-b5e6-96231b3b80d8
* Re-apply r97667 but with a little bit of thought put into the patch. This ↵Evan Cheng2010-03-031-65/+3
| | | | | | implements a special DenseMapInfo trait for DenseMap<MachineInstr*> that compare the value of the MachineInstr rather than the pointer value. Since the hashing and equality test functions ignore defs it's useful for doing CSE kind optimization. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97678 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert 97667. It broke a bunch of tests.Dan Gohman2010-03-031-0/+63
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97673 91177308-0d34-0410-b5e6-96231b3b80d8
* Move DenseMapInfo for MachineInstr* to MachineInstr.hEvan Cheng2010-03-031-63/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97667 91177308-0d34-0410-b5e6-96231b3b80d8
* Machine CSE work in progress. It's doing some CSE now. But implicit def of ↵Evan Cheng2010-03-031-24/+61
| | | | | | physical registers are getting in the way. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97664 91177308-0d34-0410-b5e6-96231b3b80d8
* Work in progress. Finding some cse now.Evan Cheng2010-03-031-4/+88
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97635 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix typo.Evan Cheng2010-03-021-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97577 91177308-0d34-0410-b5e6-96231b3b80d8
* Add skeleton of a machine level cse pass.Evan Cheng2010-03-021-0/+124
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97543 91177308-0d34-0410-b5e6-96231b3b80d8
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