http://llvm.org/bugs/show_bug.cgi?id=14267
Bug #: 14267
Summary: TargetLowering operation legality should be largely
inferred from .td files
Product: libraries
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
In a thread on llvm-commits, Chris made the comment, "I really regret not
having the TargetLowering operation legality tables not be inferred from the
.td files from the get-go." That got me thinking about it a bit, and that seems
a very doable refactorization.
Every target has a long list of setOperationAction() calls in the constructor
for the TargetLowering. The .td files have a lot of information about what
operations are legal for what types from the instruction selection patterns. If
a target only marked explicitly those actions which are required to be Custom,
everything else could default to Expand, and a lot of error-prone boilerplate
code in the constructor would go away.
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