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sv: fix size cast clipping expression width

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Zachary Snow 2021-12-30 00:01:30 -07:00 • committed by Zachary Snow
parent cb17eeaf50
commit 8c509a5659
3 changed files with 11 additions and 1 deletions
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2
CHANGELOG
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@ -16,6 +16,8 @@ Yosys 0.11 .. Yosys 0.12
- Support parameters using struct as a wiretype - Support parameters using struct as a wiretype
- Fixed regression preventing the use array querying functions in case - Fixed regression preventing the use array querying functions in case
expressions and case item expressions expressions and case item expressions
- Fixed static size casts inadvertently limiting the result width of binary
operations
* New commands and options * New commands and options
- Added "-genlib" option to "abc" pass - Added "-genlib" option to "abc" pass

3
frontends/ast/genrtlil.cc
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@ -932,7 +932,8 @@ void AstNode::detectSignWidthWorker(int &width_hint, bool &sign_hint, bool *foun
if (children.at(0)->type != AST_CONSTANT) if (children.at(0)->type != AST_CONSTANT)
log_file_error(filename, location.first_line, "Static cast with non constant expression!\n"); log_file_error(filename, location.first_line, "Static cast with non constant expression!\n");
children.at(1)->detectSignWidthWorker(width_hint, sign_hint); children.at(1)->detectSignWidthWorker(width_hint, sign_hint);
width_hint = children.at(0)->bitsAsConst().as_int(); this_width = children.at(0)->bitsAsConst().as_int();
width_hint = max(width_hint, this_width);
if (width_hint <= 0) if (width_hint <= 0)
log_file_error(filename, location.first_line, "Static cast with zero or negative size!\n"); log_file_error(filename, location.first_line, "Static cast with zero or negative size!\n");
break; break;

7
tests/simple/lesser_size_cast.sv Normal file
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@ -0,0 +1,7 @@
module top (
input signed [1:0] a,
input signed [2:0] b,
output signed [4:0] c
);
assign c = 2'(a) * b;
endmodule