From af6623ebb86e796dfe4c122f03890e0788399af0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcelina=20Ko=C5=9Bcielnicka?= <mwk@0x04.net>
Date: Wed, 15 Jul 2020 00:58:07 +0200
Subject: Add opt_dff pass.

---
 tests/opt/opt_dff_const.ys | 49 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 tests/opt/opt_dff_const.ys

(limited to 'tests/opt/opt_dff_const.ys')

diff --git a/tests/opt/opt_dff_const.ys b/tests/opt/opt_dff_const.ys
new file mode 100644
index 000000000..6a7dec7fa
--- /dev/null
+++ b/tests/opt/opt_dff_const.ys
@@ -0,0 +1,49 @@
+### Replace FFs with a const.
+
+read_verilog -icells <<EOT
+
+module top(...);
+
+input CLK;
+input EN;
+(* init=84'haaaaaaaaaaaaaaaaaaaaa *)
+output [83:0] Q;
+input SRST;
+input ARST;
+input [3:0] CLR;
+input [3:0] SET;
+
+$dff #(.CLK_POLARITY(1'b1), .WIDTH(4)) ff0 (.CLK(CLK), .D(4'hc), .Q(Q[3:0]));
+$dffe #(.CLK_POLARITY(1'b1), .EN_POLARITY(1'b1), .WIDTH(4)) ff1 (.CLK(CLK), .EN(EN), .D(4'hc), .Q(Q[7:4]));
+$adff #(.CLK_POLARITY(1'b1), .ARST_POLARITY(1'b1), .ARST_VALUE(8'hf0), .WIDTH(8)) ff2 (.CLK(CLK), .ARST(ARST), .D(8'hcc), .Q(Q[15:8]));
+$adffe #(.CLK_POLARITY(1'b1), .EN_POLARITY(1'b0), .ARST_POLARITY(1'b1), .ARST_VALUE(8'hf0), .WIDTH(8)) ff3 (.CLK(CLK), .EN(EN), .ARST(ARST), .D(8'hcc), .Q(Q[23:16]));
+$sdff #(.CLK_POLARITY(1'b1), .SRST_POLARITY(1'b1), .SRST_VALUE(8'hf0), .WIDTH(8)) ff4 (.CLK(CLK), .SRST(SRST), .D(8'hcc), .Q(Q[31:24]));
+$sdffe #(.CLK_POLARITY(1'b1), .EN_POLARITY(1'b1), .SRST_POLARITY(1'b1), .SRST_VALUE(8'hf0), .WIDTH(8)) ff5 (.CLK(CLK), .EN(EN), .SRST(SRST), .D(8'hcc), .Q(Q[39:32]));
+$sdffce #(.CLK_POLARITY(1'b1), .EN_POLARITY(1'b1), .SRST_POLARITY(1'b1), .SRST_VALUE(8'hf0), .WIDTH(8)) ff6 (.CLK(CLK), .EN(EN), .SRST(SRST), .D(8'hcc), .Q(Q[47:40]));
+$dffsr #(.CLK_POLARITY(1'b1), .CLR_POLARITY(1'b1), .SET_POLARITY(1'b0), .WIDTH(8)) ff7 (.CLK(CLK), .SET({SET, 4'hf}), .CLR({4'h0, CLR}), .D(8'hcc), .Q(Q[55:48]));
+$dffsre #(.CLK_POLARITY(1'b1), .EN_POLARITY(1'b0), .CLR_POLARITY(1'b0), .SET_POLARITY(1'b1), .WIDTH(8)) ff8 (.CLK(CLK), .EN(EN), .SET({SET, 4'h0}), .CLR({4'hf, CLR}), .D(8'hcc), .Q(Q[63:56]));
+
+$dlatch #(.EN_POLARITY(1'b1), .WIDTH(4)) ff9 (.EN(EN), .D(4'hc), .Q(Q[67:64]));
+$adlatch #(.EN_POLARITY(1'b0), .ARST_POLARITY(1'b1), .ARST_VALUE(8'hf0), .WIDTH(8)) ff10 (.EN(EN), .ARST(ARST), .D(8'hcc), .Q(Q[75:68]));
+$dlatchsr #(.EN_POLARITY(1'b0), .CLR_POLARITY(1'b1), .SET_POLARITY(1'b1), .WIDTH(8)) ff11 (.EN(EN), .SET({SET, 4'h0}), .CLR({4'h0, CLR}), .D(8'hcc), .Q(Q[83:76]));
+
+endmodule
+
+EOT
+
+design -save orig
+
+equiv_opt -undef -assert -multiclock opt_dff
+design -load postopt
+select -assert-count 1 t:$dff r:WIDTH=2 %i
+select -assert-count 1 t:$dffe r:WIDTH=2 %i
+select -assert-count 1 t:$adff r:WIDTH=6 %i
+select -assert-count 1 t:$adffe r:WIDTH=6 %i
+select -assert-count 1 t:$sdff r:WIDTH=6 %i
+select -assert-count 1 t:$sdffe r:WIDTH=6 %i
+select -assert-count 1 t:$sdffce r:WIDTH=6 %i
+select -assert-count 1 t:$dffsr r:WIDTH=6 %i
+select -assert-count 1 t:$dffsre r:WIDTH=6 %i
+select -assert-count 1 t:$dlatch r:WIDTH=2 %i
+select -assert-count 1 t:$adlatch r:WIDTH=6 %i
+select -assert-count 1 t:$dlatchsr r:WIDTH=6 %i
-- 
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