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tests: more complete testing of shift edgecases

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This commit is contained in:
George Rennie 2025-05-08 11:09:01 +02:00
parent e2485000c7
commit d59380b3a0
1 changed files with 48 additions and 7 deletions
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55
tests/opt/opt_expr_shift.ys
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@ -20,7 +20,11 @@ module top (
output wire [7:0] sshr_uu,
output wire signed [7:0] sshr_us,
output wire [7:0] sshr_su,
output wire signed [7:0] sshr_ss
output wire signed [7:0] sshr_ss,
output wire [7:0] shiftx_uu,
output wire signed [7:0] shiftx_us,
output wire [7:0] shiftx_su,
output wire signed [7:0] shiftx_ss
);
assign shl_uu = in_u << 20;
assign shl_us = in_u << 20;
@ -38,9 +42,20 @@ module top (
assign sshr_us = in_u >>> 20;
assign sshr_su = in_s >>> 20;
assign sshr_ss = in_s >>> 20;
wire [7:0] shamt = 20;
assign shiftx_uu = in_u[shamt +: 8];
assign shiftx_us = in_u[shamt +: 8];
assign shiftx_su = in_s[shamt +: 8];
assign shiftx_ss = in_s[shamt +: 8];
endmodule
EOT
select -assert-count 4 t:$shl
select -assert-count 4 t:$shr
select -assert-count 4 t:$sshl
select -assert-count 4 t:$sshr
select -assert-count 4 t:$shiftx
equiv_opt opt_expr
design -load postopt
@ -48,21 +63,46 @@ select -assert-none t:$shl
select -assert-none t:$shr
select -assert-none t:$sshl
select -assert-none t:$sshr
select -assert-none t:$shiftx
design -reset
read_verilog <<EOT
module top (in, out1, out2);
input wire in;
output wire [7:0] out1;
output wire [7:0] out2;
module top (
input wire [3:0] in,
output wire [7:0] shl,
output wire [7:0] shr,
output wire [7:0] sshl,
output wire [7:0] sshr,
output wire [7:0] shiftx,
output wire [7:0] shl_s,
output wire [7:0] shr_s,
output wire [7:0] sshl_s,
output wire [7:0] sshr_s,
output wire [7:0] shiftx_s,
);
assign shl = in << 36'hfffffffff;
assign shr = in >> 36'hfffffffff;
assign sshl = in <<< 36'hfffffffff;
assign sshr = in >>> 36'hfffffffff;
assign shiftx = in[36'hfffffffff +: 8];
assign out1 = (in >> 36'hfffffffff);
wire signed [35:0] shamt = 36'hfffffffff;
assign out2 = (in >> shamt);
assign shl_s = in << shamt;
assign shr_s = in >> shamt;
assign sshl_s = in <<< shamt;
assign sshr_s = in >>> shamt;
assign shiftx_s = in[shamt +: 8];
endmodule
EOT
select -assert-count 2 t:$shl
select -assert-count 2 t:$shr
select -assert-count 2 t:$sshl
select -assert-count 2 t:$sshr
select -assert-count 1 t:$shiftx
equiv_opt opt_expr
design -load postopt
@ -70,3 +110,4 @@ select -assert-none t:$shl
select -assert-none t:$shr
select -assert-none t:$sshl
select -assert-none t:$sshr
select -assert-none t:$shiftx