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path: root/lib/CodeGen/MachineCopyPropagation.cpp
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2012-02-20Fix machine-cp by having it to check sub-register indicies. e.g.Evan Cheng
ecx = mov eax al = mov ch The second copy is not a nop because the sub-indices of ecx,ch is not the same of that of eax/al. Re-enabled machine-cp. PR11940 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151002 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-09Erase dead copies that are clobbered by a call.Jakob Stoklund Olesen
This does make a difference, at least when using RABasic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150118 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-08Handle register masks in MachineCopyPropagation.Jakob Stoklund Olesen
For simplicity, treat calls with register masks as basic block boundaries. This means we can't copy propagate callee-saved registers across calls, but I don't think that is a big deal. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150108 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-08Codegen pass definition cleanup. No functionality.Andrew Trick
Moving toward a uniform style of pass definition to allow easier target configuration. Globally declare Pass ID. Globally declare pass initializer. Use INITIALIZE_PASS consistently. Add a call to the initializer from CodeGen.cpp. Remove redundant "createPass" functions and "getPassName" methods. While cleaning up declarations, cleaned up comments (sorry for large diff). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150100 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-08whitespaceAndrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150094 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-26Clear kill flags before propagating a copy.Jakob Stoklund Olesen
The live range of the source register may be extended when a redundant copy is eliminated. Make sure any kill flags between the two copies are cleared. This fixes PR11765. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149069 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-08Avoid eraseing copies from a reserved register unless the definition can beEvan Cheng
safely proven not to have been clobbered. No small test case possible. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147751 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-07Added a late machine instruction copy propagation pass. This catchesEvan Cheng
opportunities that only present themselves after late optimizations such as tail duplication .e.g. ## BB#1: movl %eax, %ecx movl %ecx, %eax ret The register allocator also leaves some of them around (due to false dep between copies from phi-elimination, etc.) This required some changes in codegen passes. Post-ra scheduler and the pseudo-instruction expansion passes have been moved after branch folding and tail merging. They were before branch folding before because it did not always update block livein's. That's fixed now. The pass change makes independently since we want to properly schedule instructions after branch folding / tail duplication. rdar://10428165 rdar://10640363 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147716 91177308-0d34-0410-b5e6-96231b3b80d8