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Merge pull request #2476 from zachjs/const-arg-width 

Fix constants bound to single bit arguments (fixes #2383)
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whitequark 2020-12-23 23:15:30 +00:00 committed by GitHub
parent 832f6aa777 8206546c45
commit 8ef6b77dc3
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2 changed files with 18 additions and 0 deletions
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8
frontends/ast/simplify.cc
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@ -3342,6 +3342,14 @@ skip_dynamic_range_lvalue_expansion:;
wire->type = AST_LOCALPARAM;
wire->attributes.erase(ID::nosync);
wire->children.insert(wire->children.begin(), arg->clone());
// args without a range implicitly have width 1
if (wire->children.back()->type != AST_RANGE) {
AstNode* range = new AstNode();
range->type = AST_RANGE;
wire->children.push_back(range);
range->children.push_back(mkconst_int(0, true));
range->children.push_back(mkconst_int(0, true));
}
continue;
}
AstNode *wire_id = new AstNode(AST_IDENTIFIER);

10
tests/various/const_arg_loop.v
View File

@ -44,6 +44,12 @@ module top;
end
endfunction
function automatic [16:0] operation4;
input [15:0] a;
input b;
operation4 = {a, b};
endfunction
wire [31:0] a;
assign a = 2;
@ -61,6 +67,9 @@ module top;
wire [31:0] x3;
assign x3 = operation3(A, a);
wire [16:0] x4;
assign x4 = operation4(a[15:0], 0);
// `define VERIFY
`ifdef VERIFY
assert property (a == 2);
@ -69,5 +78,6 @@ module top;
assert property (x1b == 16);
assert property (x2 == 4);
assert property (x3 == 16);
assert property (x4 == a << 1);
`endif
endmodule