[llvm-bugs] [Bug 41958] New: TableGen foreach does not support non-literal ranges

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41958

            Bug ID: 41958
           Summary: TableGen foreach does not support non-literal ranges
           Product: tools
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: TableGen
          Assignee: unassignedbugs at nondot.org
          Reporter: Matthew.Arsenault at amd.com
                CC: llvm-bugs at lists.llvm.org

I want to avoid repeating the same constant in multiple places, but TableGen
does not support nontrivial foreach bounds:

class RegisterLimitsImpl {
  int MaxSGPR = 105;
  int MaxVGPR = 255;
}

def RegisterLimits : RegisterLimitsImpl;

foreach Index = 0-RegisterLimits.MaxVGPR in {

}

$ llvm-tblgen foreach-variable-range.td    
foreach-variable-range.td:9:19: error: expected integer value as end of range
foreach Index = 0-RegisterLimits.MaxVGPR in {
                  ^
foreach-variable-range.td:9:19: error: expected declaration in for
foreach Index = 0-RegisterLimits.MaxVGPR in {

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