diff options
| -rw-r--r-- | passes/pmgen/peepopt_dffmux.pmg | 29 | ||||
| -rw-r--r-- | tests/various/peepopt.ys | 39 |
2 files changed, 64 insertions, 4 deletions
diff --git a/passes/pmgen/peepopt_dffmux.pmg b/passes/pmgen/peepopt_dffmux.pmg index 9b4fef76f..60a708616 100644 --- a/passes/pmgen/peepopt_dffmux.pmg +++ b/passes/pmgen/peepopt_dffmux.pmg @@ -1,16 +1,34 @@ pattern dffmux -state <IdString> cemuxAB +state <IdString> cemuxAB rstmuxBA +state <SigSpec> sigD match dff select dff->type == $dff select GetSize(port(dff, \D)) > 1 endmatch +match rstmux + select rstmux->type == $mux + select GetSize(port(rstmux, \Y)) > 1 + index <SigSpec> port(rstmux, \Y) === port(dff, \D) + choice <IdString> BA {\B, \A} + select port(rstmux, BA).is_fully_const() + set rstmuxBA BA + optional +endmatch + +code sigD + if (rstmux) + sigD = port(rstmux, rstmuxBA == \B ? \A : \B); + else + sigD = port(dff, \D); +endcode + match cemux select cemux->type == $mux select GetSize(port(cemux, \Y)) > 1 - index <SigSpec> port(cemux, \Y) === port(dff, \D) + index <SigSpec> port(cemux, \Y) === sigD choice <IdString> AB {\A, \B} index <SigSpec> port(cemux, AB) === port(dff, \Q) set cemuxAB AB @@ -19,6 +37,9 @@ endmatch code SigSpec &D = cemux->connections_.at(cemuxAB == \A ? \B : \A); SigSpec &Q = dff->connections_.at(\Q); + Const rst; + if (rstmux) + rst = port(rstmux, rstmuxBA).as_const(); int width = GetSize(D); if (D[width-1] == D[width-2]) { @@ -30,12 +51,12 @@ code for (i = width-1; i >= 2; i--) { if (!is_signed) { module->connect(Q[i], sign); - if (D[i-1] != sign) + if (D[i-1] != sign || (rst.size() && rst[i-1] != rst[width-1])) break; } else { module->connect(Q[i], Q[i-1]); - if (D[i-2] != sign) + if (D[i-2] != sign || (rst.size() && rst[i-1] != rst[width-1])) break; } } diff --git a/tests/various/peepopt.ys b/tests/various/peepopt.ys index 8dce679ff..886c8cd9d 100644 --- a/tests/various/peepopt.ys +++ b/tests/various/peepopt.ys @@ -110,3 +110,42 @@ design -load postopt select -assert-count 1 t:$dff r:WIDTH=5 %i select -assert-count 1 t:$mux r:WIDTH=5 %i select -assert-count 0 t:$dff t:$mux %% t:* %D + +#################### + +design -reset +read_verilog <<EOT +module peepopt_dffmuxext_unsigned_rst(input clk, ce, rst, input [1:0] i, output reg [3:0] o); + always @(posedge clk) if (rst) o <= 0; else if (ce) o <= i; +endmodule +EOT + +proc +equiv_opt -assert peepopt +design -load postopt +wreduce +select -assert-count 1 t:$dff r:WIDTH=2 %i +select -assert-count 2 t:$mux +select -assert-count 2 t:$mux r:WIDTH=2 %i +select -assert-count 0 t:$dff t:$mux %% t:* %D + +#################### + +design -reset +read_verilog <<EOT +module peepopt_dffmuxext_signed_rst(input clk, ce, rstn, input signed [1:0] i, output reg signed [3:0] o); + always @(posedge clk) begin + if (ce) o <= i; + if (!rstn) o <= 4'b1111; + end +endmodule +EOT + +proc +equiv_opt -assert peepopt +design -load postopt +wreduce +select -assert-count 1 t:$dff r:WIDTH=2 %i +select -assert-count 2 t:$mux +select -assert-count 2 t:$mux r:WIDTH=2 %i +select -assert-count 0 t:$logic_not t:$dff t:$mux %% t:* %D |