2020-12-08 02:30:16 +01:00
|
|
|
// DESCRIPTION: Verilator: Test of select from constant
|
|
|
|
|
//
|
|
|
|
|
// This file ONLY is placed under the Creative Commons Public Domain, for
|
|
|
|
|
// any use, without warranty, 2020 by Wilson Snyder.
|
|
|
|
|
// SPDX-License-Identifier: CC0-1.0
|
|
|
|
|
|
Support NBAs to arrays inside loops (#5092)
For NBAs that might execute a dynamic number of times in a single
evaluation (specifically: those that assign to array elements inside
loops), we introduce a new run-time VlNBACommitQueue data-structure
(currently a vector), which stores all pending updates and the necessary
info to reconstruct the LHS reference of the AstAssignDly at run-time.
All variables needing a commit queue has their corresponding unique
commit queue.
All NBAs to a variable that requires a commit queue go through the
commit queue. This is necessary to preserve update order in sequential
code, e.g.:
a[7] <= 10
for (int i = 1 ; i < 10; ++i) a[i] <= i;
a[2] <= 10
needs to end with array elements 1..9 being 1, 10, 3, 4, 5, 6, 7, 8, 9.
This enables supporting common forms of NBAs to arrays on the left hand
side of <= in non-suspendable/non-fork code. (Suspendable/fork
implementation is unclear to me so I left it unchanged, see #5084).
Any NBA that does not need a commit queue (i.e.: those that were
supported before), use the same scheme as before, and this patch should
have no effect on the generated code for those NBAs.
2024-05-03 13:45:49 +02:00
|
|
|
// verilator lint_off MULTIDRIVEN
|
|
|
|
|
|
2020-12-08 02:30:16 +01:00
|
|
|
module t (/*AUTOARG*/
|
|
|
|
|
// Outputs
|
|
|
|
|
o,
|
|
|
|
|
// Inputs
|
|
|
|
|
clk
|
|
|
|
|
);
|
|
|
|
|
input clk;
|
|
|
|
|
output int o;
|
|
|
|
|
|
|
|
|
|
localparam SIZE = 65536;
|
|
|
|
|
|
2024-10-09 11:39:40 +02:00
|
|
|
// Unsupported case 1: Array NBA to compund type
|
Support NBAs to arrays inside loops (#5092)
For NBAs that might execute a dynamic number of times in a single
evaluation (specifically: those that assign to array elements inside
loops), we introduce a new run-time VlNBACommitQueue data-structure
(currently a vector), which stores all pending updates and the necessary
info to reconstruct the LHS reference of the AstAssignDly at run-time.
All variables needing a commit queue has their corresponding unique
commit queue.
All NBAs to a variable that requires a commit queue go through the
commit queue. This is necessary to preserve update order in sequential
code, e.g.:
a[7] <= 10
for (int i = 1 ; i < 10; ++i) a[i] <= i;
a[2] <= 10
needs to end with array elements 1..9 being 1, 10, 3, 4, 5, 6, 7, 8, 9.
This enables supporting common forms of NBAs to arrays on the left hand
side of <= in non-suspendable/non-fork code. (Suspendable/fork
implementation is unclear to me so I left it unchanged, see #5084).
Any NBA that does not need a commit queue (i.e.: those that were
supported before), use the same scheme as before, and this patch should
have no effect on the generated code for those NBAs.
2024-05-03 13:45:49 +02:00
|
|
|
class C; endclass
|
|
|
|
|
C array2[SIZE];
|
|
|
|
|
always @ (negedge clk) begin
|
|
|
|
|
o <= int'(array2[1] == null);
|
|
|
|
|
for (int i=0; i<SIZE; i++) begin
|
|
|
|
|
array2[i] <= null; // BLKLOOPINIT
|
|
|
|
|
end
|
|
|
|
|
end
|
|
|
|
|
|
2020-12-08 02:30:16 +01:00
|
|
|
endmodule
|