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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-06-04 04:11:37 +0000 |
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| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-06-04 04:11:37 +0000 |
| commit | 1de99829b6bebe3310682efac8be2a9a95323220 (patch) | |
| tree | 3c7002ad1d2f0b8dd9c00a9280063415bb5f42b3 /include | |
| parent | 404b53e38ca7a77c6e86596ace68f3167cd33922 (diff) | |
| download | llvm-1de99829b6bebe3310682efac8be2a9a95323220.tar.gz llvm-1de99829b6bebe3310682efac8be2a9a95323220.tar.bz2 llvm-1de99829b6bebe3310682efac8be2a9a95323220.tar.xz | |
Teach TableGen to evaluate DAG expressions as set operations.
A TableGen backend can define how certain classes can be expanded into
ordered sets of defs, typically by evaluating a specific field in the
record. The SetTheory class can then evaluate DAG expressions that refer
to these named sets.
A number of standard set and list operations are predefined, and the
backend can add more specialized operators if needed. The -print-sets
backend is used by SetTheory.td to provide examples.
This is intended to simplify how register classes are defined:
def GR32_NOSP : RegisterClass<"X86", [i32], 32, (sub GR32, ESP)>;
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132621 91177308-0d34-0410-b5e6-96231b3b80d8
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