RIP $safe_pmux

2 files changed, 4 insertions, 64 deletions

diff --git a/techlibs/common/simlib.v b/techlibs/common/simlib.v
index c2f6cb278..4b3317a76 100644
--- a/techlibs/common/simlib.v
+++ b/techlibs/common/simlib.v
@@ -938,39 +938,16 @@ input [S_WIDTH-1:0] S;
 output reg [WIDTH-1:0] Y;
 
 integer i;
+reg found_active_sel_bit;
 
 always @* begin
 	Y = A;
-	for (i = 0; i < S_WIDTH; i = i+1)
-		if (S[i])
-			Y = B >> (WIDTH*i);
-end
-
-endmodule
-
-// --------------------------------------------------------
-
-module \$safe_pmux (A, B, S, Y);
-
-parameter WIDTH = 0;
-parameter S_WIDTH = 0;
-
-input [WIDTH-1:0] A;
-input [WIDTH*S_WIDTH-1:0] B;
-input [S_WIDTH-1:0] S;
-output reg [WIDTH-1:0] Y;
-
-integer i, j;
-
-always @* begin
-	j = 0;
+	found_active_sel_bit = 0;
 	for (i = 0; i < S_WIDTH; i = i+1)
 		if (S[i]) begin
-			Y = B >> (WIDTH*i);
-			j = j + 1;
+			Y = found_active_sel_bit ? 'bx : B >> (WIDTH*i);
+			found_active_sel_bit = 1;
 		end
-	if (j != 1)
-		Y = A;
 end
 
 endmodule
diff --git a/techlibs/common/techmap.v b/techlibs/common/techmap.v
index 3670bd69f..e1d5bd82f 100644
--- a/techlibs/common/techmap.v
+++ b/techlibs/common/techmap.v
@@ -794,40 +794,3 @@ module \$pmux (A, B, S, Y);
 	assign Y = |S ? Y_B : A;
 endmodule
 
-module \$safe_pmux (A, B, S, Y);
-	parameter WIDTH = 1;
-	parameter S_WIDTH = 1;
-
-	input [WIDTH-1:0] A;
-	input [WIDTH*S_WIDTH-1:0] B;
-	input [S_WIDTH-1:0] S;
-	output [WIDTH-1:0] Y;
-
-	wire [S_WIDTH-1:0] status_found_first;
-	wire [S_WIDTH-1:0] status_found_second;
-
-	genvar i;
-	generate
-		for (i = 0; i < S_WIDTH; i = i + 1) begin:GEN1
-			wire pre_first;
-			if (i > 0) begin:GEN2
-				assign pre_first = status_found_first[i-1];
-			end:GEN2 else begin:GEN3
-				assign pre_first = 0;
-			end:GEN3
-			assign status_found_first[i] = pre_first | S[i];
-			assign status_found_second[i] = pre_first & S[i];
-		end:GEN1
-	endgenerate
-
-	\$pmux #(
-		.WIDTH(WIDTH),
-		.S_WIDTH(S_WIDTH)
-	) pmux_cell (
-		.A(A),
-		.B(B),
-		.S(S & {S_WIDTH{~|status_found_second}}),
-		.Y(Y)
-	);
-endmodule
-