Merge pull request #1930 from YosysHQ/claire/fix1876

Fix handling of ternary with constant condition

1 files changed, 60 insertions, 0 deletions

diff --git a/tests/various/bug1876.ys b/tests/various/bug1876.ys
new file mode 100644
index 000000000..7995eedcf
--- /dev/null
+++ b/tests/various/bug1876.ys
@@ -0,0 +1,60 @@
+read_verilog <<EOT
+module expression_00032(b5, y15);
+  input signed [5:0] b5;
+  output [3:0] y15;
+  assign y15 = (0 ? b5 : b5) > 0;
+endmodule
+EOT
+
+
+design -reset
+read_verilog <<EOT
+module expression_00057(a0, a1, a2, a3, a4, a5, b0, b1, b2, b3, b4, b5, y8);
+  input [3:0] a0;
+  input [4:0] a1;
+  input [5:0] a2;
+  input signed [3:0] a3;
+  input signed [4:0] a4;
+  input signed [5:0] a5;
+
+  input [3:0] b0;
+  input [4:0] b1;
+  input [5:0] b2;
+  input signed [3:0] b3;
+  input signed [4:0] b4;
+  input signed [5:0] b5;
+
+  output [5:0] y8;
+
+  localparam signed [4:0] p4 = ((2'd3)||(-4'sd1));
+  localparam signed [3:0] p9 = {3{(((2'sd0)^~(5'd20))>((-3'sd0)>>(4'sd2)))}};
+
+  assign y8 = (-(!($signed({3{p9}})<(p4?b4:b5))));
+endmodule
+EOT
+
+
+design -reset
+read_verilog <<EOT
+module expression_00354(a0, a1, a2, a3, a4, a5, b0, b1, b2, b3, b4, b5, y4);
+  input [3:0] a0;
+  input [4:0] a1;
+  input [5:0] a2;
+  input signed [3:0] a3;
+  input signed [4:0] a4;
+  input signed [5:0] a5;
+
+  input [3:0] b0;
+  input [4:0] b1;
+  input [5:0] b2;
+  input signed [3:0] b3;
+  input signed [4:0] b4;
+  input signed [5:0] b5;
+
+  output wire signed [4:0] y4;
+
+  localparam signed [4:0] p10 = ((3'd0)?(2'd1):(-2'sd1));
+
+  assign y4 = ((p10?a4:b4)&$signed(b3));
+endmodule
+EOT