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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2009-12-16 18:55:53 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2009-12-16 18:55:53 +0000 |
| commit | 74215fc29fa748e006c0309671555d5873bac56a (patch) | |
| tree | 32d042de9167f3c098769bec680e3d3f83b11549 /lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | |
| parent | 4eeeb4767ca4e020e7d9aff1be671d2fc6f74b81 (diff) | |
Reuse lowered phi nodes.
Tail duplication produces lots of identical phi nodes in different basic
blocks. Teach PHIElimination to reuse the join registers when lowering a phi
node that is identical to an already lowered node. This saves virtual
registers, and more importantly it avoids creating copies the the coalescer
doesn't know how to eliminate.
Teach LiveIntervalAnalysis about the phi joins with multiple uses.
This patch significantly reduces code size produced by -pre-regalloc-taildup.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91549 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp')
0 files changed, 0 insertions, 0 deletions