8000 Wrong evaluation of unsized constant when used in operation with sized constant · Issue #3979 · chipsalliance/Surelog · GitHub
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Wrong evaluation of unsized constant when used in operation with sized constant #3979

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kamilrakoczy opened this issue Aug 7, 2024 · 0 comments
Open

Wrong evaluation of unsized constant when used in operation with sized constant #3979

kamilrakoczy opened this issue Aug 7, 2024 · 0 comments
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@kamilrakoczy
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Test:

module top();
	initial $display($bits('hff & 10'hf));
endmodule

Executing Surelog with -parse -elabuhdm gives following tree:

|uhdmallModules:
\_module_inst: work@top (work@top), file:dut.sv, line:1:1, endln:3:10
  |vpiParent:
  \_design: (work@top)
  |vpiFullName:work@top
  |vpiDefName:work@top
  |vpiProcess:
  \_initial: , line:2:2, endln:2:33
    |vpiParent:
    \_module_inst: work@top (work@top), file:dut.sv, line:1:1, endln:3:10
    |vpiStmt:
    \_sys_func_call: ($display), line:2:10, endln:2:32
      |vpiParent:
      \_initial: , line:2:2, endln:2:33
      |vpiArgument:
      \_operation: , line:2:19, endln:2:31
        |vpiParent:
        \_sys_func_call: ($display), line:2:10, endln:2:32
        |vpiOpType:28
        |vpiOperand:
        \_constant: , line:2:19, endln:2:23
          |vpiParent:
          \_operation: , line:2:19, endln:2:31
          |vpiDecompile:'hff
          |vpiSize:-1
          |HEX:ff
          |vpiConstType:5
        |vpiOperand:
        \_constant: , line:2:26, endln:2:31
          |vpiParent:
          \_operation: , line:2:19, endln:2:31
          |vpiDecompile:10'hf
          |vpiSize:10
          |HEX:f
          |vpiConstType:5
      |vpiName:$display
|uhdmtopModules:
\_module_inst: work@top (work@top), file:dut.sv, line:1:1, endln:3:10
  |vpiName:work@top
  |vpiDefName:work@top
  |vpiTop:1
  |vpiTopModule:1
  |vpiProcess:
  \_initial: , line:2:2, endln:2:33
    |vpiParent:
    \_module_inst: work@top (work@top), file:dut.sv, line:1:1, endln:3:10
    |vpiStmt:
    \_sys_func_call: ($display), line:2:10, endln:2:32
      |vpiParent:
      \_initial: , line:2:2, endln:2:33
      |vpiArgument:
      \_operation: , line:2:19, endln:2:31
        |vpiParent:
        \_sys_func_call: ($display), line:2:10, endln:2:32
        |vpiOpType:28
        |vpiOperand:
        \_constant: , line:2:19, endln:2:23
          |vpiDecompile:'hff
          |vpiSize:10
          |HEX:ff
          |vpiConstType:5
        |vpiOperand:
        \_constant: , line:2:26, endln:2:31
      |vpiName:$display

According to standard (11.6.1 Rules for expression bit lengths) such expression should have max size of both operands, where size of unsized constant should equal to size of integer.

In uhdmallModules, 'hff is unsized (|vpiSize:-1), but in uhdmtopModules it have size |vpiSize:10 instead of size of integer (in case of Surelog, I think it should be 64)

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