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-rw-r--r--CHANGELOG6
-rw-r--r--Makefile1
-rw-r--r--passes/opt/pmux2shiftx.cc14
-rw-r--r--passes/techmap/muxcover.cc31
-rw-r--r--techlibs/ecp5/synth_ecp5.cc12
-rw-r--r--techlibs/xilinx/synth_xilinx.cc49
-rwxr-xr-xtests/arch/run-test.sh18
-rw-r--r--tests/various/muxcover.ys320
-rw-r--r--tests/various/pmux2shiftx.v10
-rw-r--r--tests/various/pmux2shiftx.ys21
10 files changed, 447 insertions, 35 deletions
diff --git a/CHANGELOG b/CHANGELOG
index 8c88a7db8..4d0c31e28 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -16,12 +16,14 @@ Yosys 0.8 .. Yosys 0.8-dev
- Added "gate2lut.v" techmap rule
- Added "rename -src"
- Added "equiv_opt" pass
+ - Added "shregmap -tech xilinx"
- Added "read_aiger" frontend
- Added "muxcover -mux{4,8,16}=<cost>"
- Added "muxcover -dmux=<cost>"
- Added "muxcover -nopartial"
- Added "muxpack" pass
- - "synth_xilinx" to now infer hard shift registers, using new "shregmap -tech xilinx"
+ - Added "pmux2shiftx -norange"
+ - "synth_xilinx" to now infer hard shift registers (-nosrl to disable)
- Fixed sign extension of unsized constants with 'bx and 'bz MSB
@@ -45,7 +47,7 @@ Yosys 0.7 .. Yosys 0.8
- Added Verilog $rtoi and $itor support
- Added "check -initdrv"
- Added "read_blif -wideports"
- - Added support for systemVerilog "++" and "--" operators
+ - Added support for SystemVerilog "++" and "--" operators
- Added support for SystemVerilog unique, unique0, and priority case
- Added "write_edif" options for edif "flavors"
- Added support for resetall compiler directive
diff --git a/Makefile b/Makefile
index 76dac48a5..67bcb3d15 100644
--- a/Makefile
+++ b/Makefile
@@ -681,6 +681,7 @@ test: $(TARGETS) $(EXTRA_TARGETS)
+cd tests/svinterfaces && bash run-test.sh $(SEEDOPT)
+cd tests/opt && bash run-test.sh
+cd tests/aiger && bash run-test.sh
+ +cd tests/arch && bash run-test.sh
@echo ""
@echo " Passed \"make test\"."
@echo ""
diff --git a/passes/opt/pmux2shiftx.cc b/passes/opt/pmux2shiftx.cc
index 29870f510..65d8b8f32 100644
--- a/passes/opt/pmux2shiftx.cc
+++ b/passes/opt/pmux2shiftx.cc
@@ -221,6 +221,9 @@ struct Pmux2ShiftxPass : public Pass {
log(" select strategy for one-hot encoded control signals\n");
log(" default: pmux\n");
log("\n");
+ log(" -norange\n");
+ log(" disable $sub inference for \"range decoders\"\n");
+ log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
{
@@ -230,6 +233,7 @@ struct Pmux2ShiftxPass : public Pass {
bool optimize_onehot = true;
bool verbose = false;
bool verbose_onehot = false;
+ bool norange = false;
log_header(design, "Executing PMUX2SHIFTX pass.\n");
@@ -270,6 +274,10 @@ struct Pmux2ShiftxPass : public Pass {
verbose_onehot = true;
continue;
}
+ if (args[argidx] == "-norange") {
+ norange = true;
+ continue;
+ }
break;
}
extra_args(args, argidx, design);
@@ -559,7 +567,7 @@ struct Pmux2ShiftxPass : public Pass {
int this_inv_delta = this_maxval - this_minval;
bool this_inv = false;
- if (this_delta != this_inv_delta)
+ if (!norange && this_delta != this_inv_delta)
this_inv = this_inv_delta < this_delta;
else if (this_maxval != this_inv_maxval)
this_inv = this_inv_maxval < this_maxval;
@@ -574,7 +582,7 @@ struct Pmux2ShiftxPass : public Pass {
if (best_src_col < 0)
this_is_better = true;
- else if (this_delta != best_delta)
+ else if (!norange && this_delta != best_delta)
this_is_better = this_delta < best_delta;
else if (this_maxval != best_maxval)
this_is_better = this_maxval < best_maxval;
@@ -656,7 +664,7 @@ struct Pmux2ShiftxPass : public Pass {
// check density percentages
Const offset(State::S0, GetSize(sig));
- if (absolute_density < min_density && range_density >= min_density)
+ if (!norange && absolute_density < min_density && range_density >= min_density)
{
offset = Const(min_choice, GetSize(sig));
log(" offset: %s\n", log_signal(offset));
diff --git a/passes/techmap/muxcover.cc b/passes/techmap/muxcover.cc
index b0722134e..c84cfc39a 100644
--- a/passes/techmap/muxcover.cc
+++ b/passes/techmap/muxcover.cc
@@ -81,6 +81,23 @@ struct MuxcoverWorker
decode_mux_counter = 0;
}
+ bool xcmp(std::initializer_list<SigBit> list)
+ {
+ auto cursor = list.begin(), end = list.end();
+ log_assert(cursor != end);
+ SigBit tmp = *(cursor++);
+ while (cursor != end) {
+ SigBit bit = *(cursor++);
+ if (bit == State::Sx)
+ continue;
+ if (tmp == State::Sx)
+ tmp = bit;
+ if (bit != tmp)
+ return false;
+ }
+ return true;
+ }
+
void treeify()
{
pool<SigBit> roots;
@@ -144,6 +161,8 @@ struct MuxcoverWorker
if (tree.muxes.count(bit) == 0) {
if (first_layer || nopartial)
return false;
+ while (path[0] && path[1])
+ path++;
if (path[0] == 'S')
ret_bit = State::Sx;
else
@@ -280,7 +299,7 @@ struct MuxcoverWorker
ok = ok && follow_muxtree(S2, tree, bit, "BS");
if (nodecode)
- ok = ok && S1 == S2;
+ ok = ok && xcmp({S1, S2});
ok = ok && follow_muxtree(T1, tree, bit, "S");
@@ -330,13 +349,13 @@ struct MuxcoverWorker
ok = ok && follow_muxtree(S4, tree, bit, "BBS");
if (nodecode)
- ok = ok && S1 == S2 && S2 == S3 && S3 == S4;
+ ok = ok && xcmp({S1, S2, S3, S4});
ok = ok && follow_muxtree(T1, tree, bit, "AS");
ok = ok && follow_muxtree(T2, tree, bit, "BS");
if (nodecode)
- ok = ok && T1 == T2;
+ ok = ok && xcmp({T1, T2});
ok = ok && follow_muxtree(U1, tree, bit, "S");
@@ -407,7 +426,7 @@ struct MuxcoverWorker
ok = ok && follow_muxtree(S8, tree, bit, "BBBS");
if (nodecode)
- ok = ok && S1 == S2 && S2 == S3 && S3 == S4 && S4 == S5 && S5 == S6 && S6 == S7 && S7 == S8;
+ ok = ok && xcmp({S1, S2, S3, S4, S5, S6, S7, S8});
ok = ok && follow_muxtree(T1, tree, bit, "AAS");
ok = ok && follow_muxtree(T2, tree, bit, "ABS");
@@ -415,13 +434,13 @@ struct MuxcoverWorker
ok = ok && follow_muxtree(T4, tree, bit, "BBS");
if (nodecode)
- ok = ok && T1 == T2 && T2 == T3 && T3 == T4;
+ ok = ok && xcmp({T1, T2, T3, T4});
ok = ok && follow_muxtree(U1, tree, bit, "AS");
ok = ok && follow_muxtree(U2, tree, bit, "BS");
if (nodecode)
- ok = ok && U1 == U2;
+ ok = ok && xcmp({U1, U2});
ok = ok && follow_muxtree(V1, tree, bit, "S");
diff --git a/techlibs/ecp5/synth_ecp5.cc b/techlibs/ecp5/synth_ecp5.cc
index c6e12248e..01222e55c 100644
--- a/techlibs/ecp5/synth_ecp5.cc
+++ b/techlibs/ecp5/synth_ecp5.cc
@@ -76,7 +76,7 @@ struct SynthEcp5Pass : public ScriptPass
log(" -nodram\n");
log(" do not use distributed RAM cells in output netlist\n");
log("\n");
- log(" -nomux\n");
+ log(" -nowidelut\n");
log(" do not use PFU muxes to implement LUTs larger than LUT4s\n");
log("\n");
log(" -abc2\n");
@@ -93,7 +93,7 @@ struct SynthEcp5Pass : public ScriptPass
}
string top_opt, blif_file, edif_file, json_file;
- bool noccu2, nodffe, nobram, nodram, nomux, flatten, retime, abc2, vpr;
+ bool noccu2, nodffe, nobram, nodram, nowidelut, flatten, retime, abc2, vpr;
void clear_flags() YS_OVERRIDE
{
@@ -105,7 +105,7 @@ struct SynthEcp5Pass : public ScriptPass
nodffe = false;
nobram = false;
nodram = false;
- nomux = false;
+ nowidelut = false;
flatten = true;
retime = false;
abc2 = false;
@@ -172,8 +172,8 @@ struct SynthEcp5Pass : public ScriptPass
nodram = true;
continue;
}
- if (args[argidx] == "-nomux") {
- nomux = true;
+ if (args[argidx] == "-nowidelut" || args[argidx] == "-nomux") {
+ nowidelut = true;
continue;
}
if (args[argidx] == "-abc2") {
@@ -264,7 +264,7 @@ struct SynthEcp5Pass : public ScriptPass
run("abc", " (only if -abc2)");
}
run("techmap -map +/ecp5/latches_map.v");
- if (nomux)
+ if (nowidelut)
run("abc -lut 4 -dress");
else
run("abc -lut 4:7 -dress");
diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc
index a293081f1..7dc9915e9 100644
--- a/techlibs/xilinx/synth_xilinx.cc
+++ b/techlibs/xilinx/synth_xilinx.cc
@@ -42,8 +42,9 @@ struct SynthXilinxPass : public ScriptPass
log(" -top <module>\n");
log(" use the specified module as top module\n");
log("\n");
- log(" -arch {xcup|xcu|xc7|xc6s}\n");
+ log(" -family {xcup|xcu|xc7|xc6s}\n");
log(" run synthesis for the specified Xilinx architecture\n");
+ log(" generate the synthesis netlist for the specified family.\n");
log(" default: xc7\n");
log("\n");
log(" -edif <file>\n");
@@ -67,6 +68,12 @@ struct SynthXilinxPass : public ScriptPass
log(" -nosrl\n");
log(" disable inference of shift registers\n");
log("\n");
+ log(" -nocarry\n");
+ log(" do not use XORCY/MUXCY/CARRY4 cells in output netlist\n");
+ log("\n");
+ log(" -nowidelut\n");
+ log(" do not use MUXF[78] resources to implement LUTs larger than LUT6s\n");
+ log("\n");
log(" -run <from_label>:<to_label>\n");
log(" only run the commands between the labels (see below). an empty\n");
log(" from label is synonymous to 'begin', and empty to label is\n");
@@ -84,8 +91,8 @@ struct SynthXilinxPass : public ScriptPass
log("\n");
}
- std::string top_opt, edif_file, blif_file, arch;
- bool flatten, retime, vpr, nobram, nodram, nosrl;
+ std::string top_opt, edif_file, blif_file, family;
+ bool flatten, retime, vpr, nobram, nodram, nosrl, nocarry, nowidelut;
void clear_flags() YS_OVERRIDE
{
@@ -98,7 +105,9 @@ struct SynthXilinxPass : public ScriptPass
nobram = false;
nodram = false;
nosrl = false;
- arch = "xc7";
+ nocarry = false;
+ nowidelut = false;
+ family = "xc7";
}
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
@@ -113,8 +122,8 @@ struct SynthXilinxPass : public ScriptPass
top_opt = "-top " + args[++argidx];
continue;
}
- if (args[argidx] == "-arch" && argidx+1 < args.size()) {
- arch = args[++argidx];
+ if ((args[argidx] == "-family" || args[argidx] == "-arch") && argidx+1 < args.size()) {
+ family = args[++argidx];
continue;
}
if (args[argidx] == "-edif" && argidx+1 < args.size()) {
@@ -141,6 +150,14 @@ struct SynthXilinxPass : public ScriptPass
retime = true;
continue;
}
+ if (args[argidx] == "-nocarry") {
+ nocarry = true;
+ continue;
+ }
+ if (args[argidx] == "-nowidelut") {
+ nowidelut = true;
+ continue;
+ }
if (args[argidx] == "-vpr") {
vpr = true;
continue;
@@ -161,8 +178,8 @@ struct SynthXilinxPass : public ScriptPass
}
extra_args(args, argidx, design);
- if (arch != "xcup" && arch != "xcu" && arch != "xc7" && arch != "xc6s")
- log_cmd_error("Invalid Xilinx -arch setting: %s\n", arch.c_str());
+ if (family != "xcup" && family != "xcu" && family != "xc7" && family != "xc6s")
+ log_cmd_error("Invalid Xilinx -family setting: %s\n", family.c_str());
if (!design->full_selection())
log_cmd_error("This command only operates on fully selected designs!\n");
@@ -237,10 +254,14 @@ struct SynthXilinxPass : public ScriptPass
run("shregmap -tech xilinx -minlen 3", "(skip if '-nosrl')");
}
- if (!vpr || help_mode)
- run("techmap -map +/techmap.v -map +/xilinx/arith_map.v");
- else
- run("techmap -map +/techmap.v +/xilinx/arith_map.v -D _EXPLICIT_CARRY");
+ if (help_mode)
+ run("techmap -map +/techmap.v [-map +/xilinx/arith_map.v]", "(skip if '-nocarry')");
+ else if (!nocarry) {
+ if (!vpr)
+ run("techmap -map +/techmap.v -map +/xilinx/arith_map.v");
+ else
+ run("techmap -map +/techmap.v -map +/xilinx/arith_map.v -D _EXPLICIT_CARRY");
+ }
run("opt -fast");
}
@@ -252,7 +273,9 @@ struct SynthXilinxPass : public ScriptPass
if (check_label("map_luts")) {
if (help_mode)
- run("abc -luts 2:2,3,6:5,10,20 [-dff]");
+ run("abc -luts 2:2,3,6:5[,10,20] [-dff]", "(skip if 'nowidelut', only for '-retime')");
+ else if (nowidelut)
+ run("abc -luts 2:2,3,6:5" + string(retime ? " -dff" : ""));
else
run("abc -luts 2:2,3,6:5,10,20" + string(retime ? " -dff" : ""));
run("clean");
diff --git a/tests/arch/run-test.sh b/tests/arch/run-test.sh
new file mode 100755
index 000000000..5292d1615
--- /dev/null
+++ b/tests/arch/run-test.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+
+set -e
+
+echo "Running syntax check on arch sim models"
+for arch in ../../techlibs/*; do
+ find $arch -name cells_sim.v | while read path; do
+ echo -n "Test $path ->"
+ iverilog -t null -I$arch $path
+ echo " ok"
+ done
+done
+
+for path in "../../techlibs/common/simcells.v" "../../techlibs/common/simlib.v"; do
+ echo -n "Test $path ->"
+ iverilog -t null $path
+ echo " ok"
+done
diff --git a/tests/various/muxcover.ys b/tests/various/muxcover.ys
index 8ef619b46..67e9625e6 100644
--- a/tests/various/muxcover.ys
+++ b/tests/various/muxcover.ys
@@ -188,3 +188,323 @@ design -import gate -as gate
miter -equiv -flatten -make_assert -make_outputs gold gate miter
sat -verify -prove-asserts -show-ports miter
+## MUX2 in MUX4 :: https://github.com/YosysHQ/yosys/issues/1132
+
+design -reset
+read_verilog -formal <<EOT
+module mux2in4(input [1:0] i, input s, output o);
+ assign o = s ? i[1] : i[0];
+endmodule
+EOT
+prep
+design -save gold
+
+techmap
+muxcover -mux4=99 -nodecode
+clean
+opt_expr -mux_bool
+select -assert-count 0 t:$_MUX_
+select -assert-count 1 t:$_MUX4_
+select -assert-count 0 t:$_MUX8_
+select -assert-count 0 t:$_MUX16_
+techmap -map +/simcells.v t:$_MUX4_
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+
+miter -equiv -flatten -make_assert -make_outputs gold gate miter
+sat -verify -prove-asserts -show-ports miter
+
+## MUX2 in MUX8 :: https://github.com/YosysHQ/yosys/issues/1132
+
+design -reset
+read_verilog -formal <<EOT
+module mux2in8(input [1:0] i, input s, output o);
+ assign o = s ? i[1] : i[0];
+endmodule
+EOT
+prep
+design -save gold
+
+techmap
+muxcover -mux8=99 -nodecode
+clean
+opt_expr -mux_bool
+select -assert-count 0 t:$_MUX_
+select -assert-count 0 t:$_MUX4_
+select -assert-count 1 t:$_MUX8_
+select -assert-count 0 t:$_MUX16_
+techmap -map +/simcells.v t:$_MUX8_
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+
+miter -equiv -flatten -make_assert -make_outputs gold gate miter
+sat -verify -prove-asserts -show-ports miter
+
+## MUX4 in MUX8 :: https://github.com/YosysHQ/yosys/issues/1132
+
+design -reset
+read_verilog -formal <<EOT
+module mux4in8(input [3:0] i, input [1:0] s, output o);
+ assign o = s[1] ? (s[0] ? i[3] : i[2]) : (s[0] ? i[1] : i[0]);
+endmodule
+EOT
+prep
+design -save gold
+
+techmap
+muxcover -mux8=299 -nodecode
+clean
+opt_expr -mux_bool
+select -assert-count 0 t:$_MUX_
+select -assert-count 0 t:$_MUX4_
+select -assert-count 1 t:$_MUX8_
+select -assert-count 0 t:$_MUX16_
+techmap -map +/simcells.v t:$_MUX8_
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+
+miter -equiv -flatten -make_assert -make_outputs gold gate miter
+sat -verify -prove-asserts -show-ports miter
+
+## MUX2 in MUX16 :: https://github.com/YosysHQ/yosys/issues/1132
+
+design -reset
+read_verilog -formal <<EOT
+module mux2in16(input [1:0] i, input s, output o);
+ assign o = s ? i[1] : i[0];
+endmodule
+EOT
+prep
+design -save gold
+
+techmap
+muxcover -mux16=99 -nodecode
+clean
+opt_expr -mux_bool
+select -assert-count 0 t:$_MUX_
+select -assert-count 0 t:$_MUX4_
+select -assert-count 0 t:$_MUX8_
+select -assert-count 1 t:$_MUX16_
+techmap -map +/simcells.v t:$_MUX16_
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+
+miter -equiv -flatten -make_assert -make_outputs gold gate miter
+sat -verify -prove-asserts -show-ports miter
+
+## MUX4 in MUX16 :: https://github.com/YosysHQ/yosys/issues/1132
+
+design -reset
+read_verilog -formal <<EOT
+module mux4in16(input [3:0] i, input [1:0] s, output o);
+ assign o = s[1] ? (s[0] ? i[3] : i[2]) : (s[0] ? i[1] : i[0]);
+endmodule
+EOT
+prep
+design -save gold
+
+techmap
+muxcover -mux16=299 -nodecode
+clean
+opt_expr -mux_bool
+select -assert-count 0 t:$_MUX_
+select -assert-count 0 t:$_MUX4_
+select -assert-count 0 t:$_MUX8_
+select -assert-count 1 t:$_MUX16_
+techmap -map +/simcells.v t:$_MUX16_
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+
+miter -equiv -flatten -make_assert -make_outputs gold gate miter
+sat -verify -prove-asserts -show-ports miter
+
+## MUX8 in MUX16 :: https://github.com/YosysHQ/yosys/issues/1132
+
+design -reset
+read_verilog -formal <<EOT
+module mux4in16(input [7:0] i, input [2:0] s, output o);
+ assign o = s[2] ? s[1] ? (s[0] ? i[3] : i[2]) : (s[0] ? i[1] : i[0])
+ : s[1] ? (s[0] ? i[7] : i[6]) : (s[0] ? i[5] : i[4]);
+endmodule
+EOT
+prep
+design -save gold
+
+techmap
+muxcover -mux16=699 -nodecode
+clean
+opt_expr -mux_bool
+select -assert-count 0 t:$_MUX_
+select -assert-count 0 t:$_MUX4_
+select -assert-count 0 t:$_MUX8_
+select -assert-count 1 t:$_MUX16_
+techmap -map +/simcells.v t:$_MUX16_
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+
+miter -equiv -flatten -make_assert -make_outputs gold gate miter
+sat -verify -prove-asserts -show-ports miter
+
+## mux_if_bal_5_1 :: https://github.com/YosysHQ/yosys/issues/1132
+
+design -reset
+read_verilog -formal <<EOT
+module mux_if_bal_5_1 #(parameter N=5, parameter W=1) (input [N*W-1:0] i, input [$clog2(N)-1:0] s, output reg [W-1:0] o);
+always @* begin
+ o <= {{W{{1'bx}}}};
+ if (s[0] == 1'b0)
+ if (s[1] == 1'b0)
+ if (s[2] == 1'b0)
+ o <= i[0*W+:W];
+ else
+ o <= i[1*W+:W];
+ else
+ if (s[2] == 1'b0)
+ o <= i[2*W+:W];
+ else
+ o <= i[3*W+:W];
+ else
+ if (s[1] == 1'b0)
+ if (s[2] == 1'b0)
+ o <= i[4*W+:W];
+end
+endmodule
+EOT
+prep
+design -save gold
+
+wreduce
+opt -full
+techmap
+muxcover -mux8=350
+clean
+opt_expr -mux_bool
+select -assert-count 0 t:$_MUX_
+select -assert-count 0 t:$_MUX4_
+select -assert-count 1 t:$_MUX8_
+select -assert-count 0 t:$_MUX16_
+techmap -map +/simcells.v t:$_MUX8_
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+
+miter -equiv -flatten -make_assert -make_outputs -ignore_gold_x gold gate miter
+sat -verify -prove-asserts -show-ports miter
+
+## mux_if_bal_5_1 (nodecode) :: https://github.com/YosysHQ/yosys/issues/1132
+design -load gold
+
+wreduce
+opt -full
+techmap
+muxcover -mux8=350 -nodecode
+clean
+opt_expr -mux_bool
+select -assert-count 0 t:$_MUX_
+select -assert-count 0 t:$_MUX4_
+select -assert-count 1 t:$_MUX8_
+select -assert-count 0 t:$_MUX16_
+techmap -map +/simcells.v t:$_MUX8_
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+
+miter -equiv -flatten -make_assert -make_outputs -ignore_gold_x gold gate miter
+sat -verify -prove-asserts -show-ports miter
+
+## mux_if_bal_9_1 :: https://github.com/YosysHQ/yosys/issues/1132
+
+design -reset
+read_verilog -formal <<EOT
+module mux_if_bal_9_1 #(parameter N=9, parameter W=1) (input [N*W-1:0] i, input [$clog2(N)-1:0] s, output reg [W-1:0] o);
+always @* begin
+ o <= {{W{{1'bx}}}};
+ if (s[3] == 1'b0)
+ if (s[2] == 1'b0)
+ if (s[1] == 1'b0)
+ if (s[0] == 1'b0)
+ o <= i[0*W+:W];
+ else
+ o <= i[1*W+:W];
+ else
+ if (s[0] == 1'b0)
+ o <= i[2*W+:W];
+ else
+ o <= i[3*W+:W];
+ else
+ if (s[1] == 1'b0)
+ if (s[0] == 1'b0)
+ o <= i[4*W+:W];
+ else
+ o <= i[5*W+:W];
+ else
+ if (s[0] == 1'b0)
+ o <= i[6*W+:W];
+ else
+ o <= i[7*W+:W];
+ else
+ if (s[2] == 1'b0)
+ if (s[1] == 1'b0)
+ if (s[0] == 1'b0)
+ o <= i[8*W+:W];
+end
+endmodule
+EOT
+prep
+design -save gold
+
+wreduce
+opt -full
+techmap
+muxcover -mux16=750
+clean
+opt_expr -mux_bool
+select -assert-count 0 t:$_MUX_
+select -assert-count 0 t:$_MUX4_
+select -assert-count 0 t:$_MUX8_
+select -assert-count 1 t:$_MUX16_
+techmap -map +/simcells.v t:$_MUX16_
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+
+miter -equiv -flatten -make_assert -make_outputs -ignore_gold_x gold gate miter
+sat -verify -prove-asserts -show-ports miter
+
+## mux_if_bal_9_1 (nodecode) :: https://github.com/YosysHQ/yosys/issues/1132
+
+design -load gold
+
+wreduce
+opt -full
+techmap
+muxcover -mux16=750 -nodecode
+clean
+opt_expr -mux_bool
+select -assert-count 0 t:$_MUX_
+select -assert-count 0 t:$_MUX4_
+select -assert-count 0 t:$_MUX8_
+select -assert-count 1 t:$_MUX16_
+techmap -map +/simcells.v t:$_MUX16_
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+
+miter -equiv -flatten -make_assert -make_outputs -ignore_gold_x gold gate miter
+sat -verify -prove-asserts -show-ports miter
diff --git a/tests/various/pmux2shiftx.v b/tests/various/pmux2shiftx.v
index fec84187b..563394080 100644
--- a/tests/various/pmux2shiftx.v
+++ b/tests/various/pmux2shiftx.v
@@ -32,3 +32,13 @@ module pmux2shiftx_test (
endcase
end
endmodule
+
+module issue01135(input [7:0] i, output o);
+always @*
+case (i[6:3])
+ 4: o <= i[0];
+ 3: o <= i[2];
+ 7: o <= i[3];
+ default: o <= 1'b0;
+endcase
+endmodule
diff --git a/tests/various/pmux2shiftx.ys b/tests/various/pmux2shiftx.ys
index deb134083..51ee2f7be 100644
--- a/tests/various/pmux2shiftx.ys
+++ b/tests/various/pmux2shiftx.ys
@@ -1,4 +1,7 @@
read_verilog pmux2shiftx.v
+design -save read
+
+hierarchy -top pmux2shiftx_test
prep
design -save gold
@@ -21,8 +24,16 @@ design -import gate -as gate
miter -equiv -flatten -make_assert -make_outputs gold gate miter
sat -verify -prove-asserts -show-ports miter
-design -load gold
-stat
-
-design -load gate
-stat
+#design -load gold
+#stat
+#
+#design -load gate
+#stat
+
+design -load read
+hierarchy -top issue01135
+proc
+pmux2shiftx -norange
+opt -full
+select -assert-count 0 t:$shift*
+select -assert-count 1 t:$pmux
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-07 06:05:29 +0000