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Add read_verilog $changed support 

Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Dan Gisselquist 2018-10-01 19:41:35 +02:00 committed by Jim Lawson
parent ae8637cd63
commit d3be61b9dc
1 changed files with 4 additions and 1 deletions
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5
frontends/ast/simplify.cc
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@ -1836,7 +1836,7 @@ skip_dynamic_range_lvalue_expansion:;
goto apply_newNode;
}
if (str == "\\$stable" || str == "\\$rose" || str == "\\$fell")
if (str == "\\$stable" || str == "\\$rose" || str == "\\$fell" || str == "\\$changed")
{
if (GetSize(children) != 1)
log_file_error(filename, linenum, "System function %s got %d arguments, expected 1.\n",
@ -1853,6 +1853,9 @@ skip_dynamic_range_lvalue_expansion:;
if (str == "\\$stable")
newNode = new AstNode(AST_EQ, past, present);
else if (str == "\\$changed")
newNode = new AstNode(AST_NE, past, present);
else if (str == "\\$rose")
newNode = new AstNode(AST_LOGIC_AND, new AstNode(AST_LOGIC_NOT, past), present);