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| author | Chris Lattner <sabre@nondot.org> | 2011-02-13 22:25:43 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2011-02-13 22:25:43 +0000 |
| commit | 0a9481f44fe4fc76e59109992940a76b2a3f9b3b (patch) | |
| tree | 58e330925b67825f38c827f416eb9dc2e5d9ee1e /lib/CodeGen/PHIElimination.cpp | |
| parent | eafbe659f8cd88584bef5f7ad2500b42227d02ab (diff) | |
Enhance ComputeMaskedBits to know that aligned frameindexes
have their low bits set to zero. This allows us to optimize
out explicit stack alignment code like in stack-align.ll:test4 when
it is redundant.
Doing this causes the code generator to start turning FI+cst into
FI|cst all over the place, which is general goodness (that is the
canonical form) except that various pieces of the code generator
don't handle OR aggressively. Fix this by introducing a new
SelectionDAG::isBaseWithConstantOffset predicate, and using it
in places that are looking for ADD(X,CST). The ARM backend in
particular was missing a lot of addressing mode folding opportunities
around OR.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125470 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/PHIElimination.cpp')
0 files changed, 0 insertions, 0 deletions