DFCxx simulation

README.md

@@ -211,12 +211,12 @@ The compiled Utopia HLS executable has a CLI to accept a number of parameters af
 
 For the executable there are three general arguments: `-h,--help`, `-H,--help-all` and `-v,--version` for printing simple and extended help-messages, and printing current executable's version respectively.
 
-Unless neither of the three arguments is used, first argument is the mode which the executable has to function in. Currently there is only one available mode `hls`.
+Unless neither of the three arguments is used, first argument is the mode which the executable has to function in. Currently there are only two available modes: `hls` and `sim`.
 
-The list of arguments for `hls`-mode is presented below:
+`hls` mode is used to perform the high-level synthesis of digital hardware description from the input DFCxx kernel. The list of arguments for `hls`-mode is presented below:
 
 * `-h,--help`: *optional* flag; used to print the help-message about other arguments.
-* `--config <PATH>`: *required* filesystem-path option; used to specify the file for a JSON latency configuration file. Its format is presented in *JSON Configuration* section.
+* `--config <PATH>`: *required* filesystem-path option; used to specify the file for a JSON latency configuration file. Its format is presented in `docs/latency_config.md`.
 * `--out-sv <PATH>`: *optional* filesystem-path option; used to specify the output SystemVerilog file.
 * `--out-sv-lib <PATH>`: *optional* filesystem-path option; used to specify the output SystemVerilog file for generated operations library.
 * `--out-dfcir <PATH>`: *optional* filesystem-path option; used to specify the output DFCIR file.
@@ -232,43 +232,13 @@ Here is an example of an Utopia HLS CLI call:
 umain hls --config ~/utopia-user/config.json --out-sv ~/outFile.sv --out-dfcir ~/outFile2.mlir -a
 ```
 
-### JSON Configuration
+`sim` mode is used to simulate the input DFCxx kernel. The list of arguments for `sim`-mode is presented below:
 
-Latency configuration for each computational operation (number of pipeline stages) used in a DFCxx kernel is provided via a JSON file.
-
-Currently each operation has two specifications: for integer values (`INT`) and floating point (`FLOAT`) values. 
-
-The list of all computational operations is provided below:
-
-* `ADD` - Addition
-* `SUB` - Subtraction
-* `MUL` - Multiplication
-* `DIV` - Division
-* `AND` - Logical conjunction
-* `OR` - Logical disjunction
-* `XOR` - Exclusive logical disjunction
-* `NOT` - Logical inversion
-* `NEG` - Negation
-* `LESS` - "less" comparison
-* `LESSEQ` - "less or equal" comparison
-* `GREATER` - "greater" comparison 
-* `GREATEREQ` - "greater or equal" comparison
-* `EQ` - "equal" comparison
-* `NEQ` - "not equal" comparison
-
-JSON configuration structure states that for every operation with a specific configuration (each pair is represented as a separate JSON-field with `_` between pair's elements) present in the kernel, operation's latency will be provided. 
-
-Here is an example of a JSON configuration file, containing latencies for multiplication, addition and subtraction of integer numbers:
-
-```json
-{
-  "MUL_INT": 3,
-  "ADD_INT": 1,
-  "SUB_INT": 1
-}
-```
+* `-h,--help`: *optional* flag; used to print the help-message about other arguments.
+* `--in <PATH>`: *optional* filesystem-path option; used to specify the input file for simulation data (default: `sim.txt`). Its format is presented in `docs/simulation.md`.
+* `--out <PATH>`: *optional* filesystem-path option; used to specify the output VCD file (default: `sim_out.vcd`).
 
-## Examples
+### Examples
 
 Root subdirectory `examples` contains different examples of DFCxx kernels, `start`-function definitions and JSON configuration files.
 
@@ -282,7 +252,15 @@ build/src/umain hls --config examples/polynomial2/add_int_2_mul_int3.json -a --o
 
 The execution command is going to pass a JSON configuration file (with 2 and 3 pipeline stages for integer addition
 and multiplication respectively) to Utopia HLS, resulting in the creation of the file `output`, containing a SystemVerilog
-module for Polynomial2 kernel with a greedy ASAP-scheduling.
+module for `Polynomial2` kernel with a greedy ASAP-scheduling.
+
+The same kernel can be simulated with:
+
+```bash
+build/src/umain sim --in examples/polynomial2/sim.txt --out output.vcd
+```
+
+This command uses the simulation data from `sim.txt` file and stores the simulation trace in the output file `output.vcd`.
 
 ## DFCxx Documentation
 

config.json

@@ -8,5 +8,9 @@
     "out_dfcir"      : "",
     "out_firrtl"     : "",
     "out_dot"        : ""
+  },
+  "sim": {
+    "in"           : "sim.txt",
+    "out"          : "sim_out.vcd"
   }
 }

docs/latency_config.md

@@ -0,0 +1,35 @@
+## JSON Configuration
+
+Latency configuration (in terms of pipeline stages) for each computational operation used in a DFCxx kernel is provided via a JSON file.
+
+Currently each operation has two specifications based on the types of its arguments: for integer values (`INT`) and floating point (`FLOAT`) values respectively. 
+
+All the supported computational operations are listed below:
+
+* `ADD` - Addition
+* `SUB` - Subtraction
+* `MUL` - Multiplication
+* `DIV` - Division
+* `AND` - Logical conjunction
+* `OR` - Logical disjunction
+* `XOR` - Exclusive logical disjunction
+* `NOT` - Logical inversion
+* `NEG` - Negation
+* `LESS` - "less" comparison
+* `LESSEQ` - "less or equal" comparison
+* `GREATER` - "greater" comparison 
+* `GREATEREQ` - "greater or equal" comparison
+* `EQ` - "equal" comparison
+* `NEQ` - "not equal" comparison
+
+JSON configuration structure states that for every operation with a specific configuration (each pair is represented as a separate JSON-field with `_` between pair's elements) present in the kernel, operation's latency has to be provided. 
+
+Here is an example of a JSON configuration file, containing latencies for multiplication, addition and subtraction of integer numbers:
+
+```json
+{
+  "MUL_INT": 3,
+  "ADD_INT": 1,
+  "SUB_INT": 1
+}
+```

docs/simulation.md

@@ -0,0 +1,32 @@
+## DFCxx Simulation
+
+DFCxx kernels can be simulated to check that they describe computations as expected. The simulation doesn't take scheduling into account and requires every computational node to use **and** accept some values at every simulation tick.
+
+### Input format
+
+The format to provide simulation input data is the following:
+
+* input data is divided into blocks separated with a newline character (`\n`) - one block for each simulation step
+* every block has a number of lines, each of which has the case-sensitive name of some **input** stream/scalar variable and its hex-value (these values do not have an explicit type - they will be casted to the types of related computational nodes)
+* stream/scalar value name and the hex-value are separated with a single space character (` `)
+* the provided value must be a valid hex-value: with or without `0x`, with either lower- or uppercase letters
+* if some stream/scalar hex-value is present twice or more in the same block - its latest described value is used
+
+Here is an example of an input simulation file for `MuxMul` kernel, which has two input streams: `x` (unsigned 32-bit integer values) and `ctrl` (unsigned 1-bit integer values).
+
+```txt
+x 0x32
+ctrl 0x1
+
+x 0x45
+ctrl 0x0
+
+x 0x56
+ctrl 0x1
+```
+
+In this example, `x` accepts values `50` (`0x32`), `69` (`0x45`) and `86` (`0x56`), while `ctrl` accepts `1`, `0` and `1`. This means that 3 simulation ticks will be performed for the provided kernel.
+
+### Not Supported Constructions
+
+* *offsets*

examples/addconst/sim.txt

@@ -0,0 +1,5 @@
+x 0x32
+
+x 0x45
+
+x 0x56

examples/idct/idct.h

@@ -53,17 +53,17 @@ class IDCT : public dfcxx::Kernel {
       DFVariable x7 = (values[kDIM * i + 3]);
 
       DFVariable x8 = (x4 + x5) * W7;
-      x4 = x8 + (W1 - W7) * x4;
-      x5 = x8 - (W1 - W7) * x5;
-      x8 = W3 * (x6 + x7);
-      x6 = x8 - (W3 - W5) * x6;
-      x7 = x8 - (W3 + W5) * x7;
+      x4 = x8 + x4 * (W1 - W7);
+      x5 = x8 - x5 * (W1 + W7);
+      x8 = (x6 + x7) * W3;
+      x6 = x8 - x6 * (W3 - W5);
+      x7 = x8 - x7 * (W3 + W5);
 
       x8 = x0 + x1;
       x0 = x0 - x1;
       x1 = (x3 + x2) * W6;
-      x2 = x1 - (W2 + W6) * x2;
-      x3 = x1 + (W2 - W6) * x3;
+      x2 = x1 - x2 * (W2 + W6);
+      x3 = x1 + x3 * (W2 - W6);
       x1 = x4 + x6;
       x4 = x4 - x6;
       x6 = x5 + x7;
@@ -97,17 +97,17 @@ class IDCT : public dfcxx::Kernel {
       DFVariable x7 = values[kDIM * 3 + i];
 
       DFVariable x8 = ((x4 + x5) * W7) + const4;
-      x4 = (x8 + (W1 - W7) * x4) >> 3;
-      x5 = (x8 - (W1 - W7) * x5) >> 3;
-      x8 = (W3 * (x6 + x7)) + const4;
-      x6 = (x8 - (W3 - W5) * x6) >> 3;
-      x7 = (x8 - (W3 + W5) * x7) >> 3;
+      x4 = (x8 + x4 * (W1 - W7)) >> 3;
+      x5 = (x8 - x5 * (W1 + W7)) >> 3;
+      x8 = ((x6 + x7) * W3) + const4;
+      x6 = (x8 - x6 * (W3 - W5)) >> 3;
+      x7 = (x8 - x7 * (W3 + W5)) >> 3;
 
       x8 = x0 + x1;
       x0 = x0 - x1;
       x1 = ((x3 + x2) * W6) + const4;
-      x2 = (x1 - (W2 + W6) * x2) >> 3;
-      x3 = (x1 + (W2 - W6) * x3) >> 3;
+      x2 = (x1 - x2 * (W2 + W6)) >> 3;
+      x3 = (x1 + x3 * (W2 - W6)) >> 3;
       x1 = x4 + x6;
       x4 = x4 - x6;
       x6 = x5 + x7;
@@ -119,7 +119,7 @@ class IDCT : public dfcxx::Kernel {
       x0 = x0 - x2;
       x2 = (((x4 + x5) * const181) + const128) >> 8;
       x4 = (((x4 - x5) * const181) + const128) >> 8;
-      
+
       values[kDIM * 0 + i] = (x7 + x1) >> 14;
       values[kDIM * 1 + i] = (x3 + x2) >> 14;
       values[kDIM * 2 + i] = (x0 + x4) >> 14;

examples/idct/sim.txt

@@ -0,0 +1,64 @@
+x0 0x0
+x1 0x1
+x2 0x2
+x3 0x3
+x4 0x4
+x5 0x5
+x6 0x6
+x7 0x7
+x8 0x8
+x9 0x9
+x10 0xA
+x11 0xB
+x12 0xC
+x13 0xD
+x14 0xE
+x15 0xF
+x16 0x10
+x17 0x11
+x18 0x12
+x19 0x13
+x20 0x14
+x21 0x15
+x22 0x16
+x23 0x17
+x24 0x18
+x25 0x19
+x26 0x1A
+x27 0x1B
+x28 0x1C
+x29 0x1D
+x30 0x1E
+x31 0x1F
+x32 0x20
+x33 0x21
+x34 0x22
+x35 0x23
+x36 0x24
+x37 0x25
+x38 0x26
+x39 0x27
+x40 0x28
+x41 0x29
+x42 0x2A
+x43 0x2B
+x44 0x2C
+x45 0x2D
+x46 0x2E
+x47 0x2F
+x48 0x30
+x49 0x31
+x50 0x32
+x51 0x33
+x52 0x34
+x53 0x35
+x54 0x36
+x55 0x37
+x56 0x38
+x57 0x39
+x58 0x3A
+x59 0x3B
+x60 0x3C
+x61 0x3D
+x62 0x3E
+x63 0x3F

examples/matrixmul2/sim.txt

@@ -0,0 +1,8 @@
+x11 0x32
+x12 0x64
+x21 0x48
+x22 0x99
+y11 0x1
+y12 0x0
+y21 0x0
+y22 0x1

examples/muxmul/sim.txt

@@ -0,0 +1,8 @@
+x 0x32
+ctrl 0x1
+
+x 0x45
+ctrl 0x0
+
+x 0x56
+ctrl 0x1

examples/polynomial2/sim.txt

@@ -0,0 +1,5 @@
+x 0x32
+
+x 0x45
+
+x 0x56

examples/scalar3/sim.txt

@@ -0,0 +1,6 @@
+x1 0x2
+y1 0x32
+x2 0x3
+y2 0x32
+x3 0x4
+y3 0x32

src/main.cpp

@@ -19,29 +19,42 @@
 
 INITIALIZE_EASYLOGGINGPP
 
+// User-defined function to specify functional behaviour of top-level kernel.
+std::unique_ptr<dfcxx::Kernel> start();
+
 //===-----------------------------------------------------------------------===/
 // High-Level Synthesis
 //===-----------------------------------------------------------------------===/
 
 struct HlsContext {
-  HlsContext(const HlsOptions &options):
-    options(options)
-    {}
+  HlsContext(const HlsOptions &options) : options(options) {}
 
   const HlsOptions &options;
 };
 
-// User-defined function to specify functional behaviour of top-level kernel.
-std::unique_ptr<dfcxx::Kernel> start();
+//===-----------------------------------------------------------------------===/
+// DFCxx Simulation.
+//===-----------------------------------------------------------------------===/
+
+struct SimContext {
+  SimContext(const SimOptions &options): options(options) {}
 
-int hlsMain(HlsContext &context) {
+  const SimOptions &options;
+};
+
+int hlsMain(const HlsContext &context) {
   auto kernel = start();
   bool useASAP = context.options.asapScheduler;
-  kernel->compile(context.options.latConfig,
-                  context.options.outNames,
-                  (useASAP) ? dfcxx::Scheduler::ASAP 
-                            : dfcxx::Scheduler::Linear);
-  return 0;
+  return !kernel->compile(context.options.latencyCfg,
+                          context.options.outNames,
+                          (useASAP) ? dfcxx::Scheduler::ASAP 
+                                    : dfcxx::Scheduler::Linear);
+}
+
+int simMain(const SimContext &context) {
+  auto kernel = start();
+  return !kernel->simulate(context.options.inFilePath,
+                           context.options.outFilePath);
 }
 
 int main(int argc, char **argv) {
@@ -63,7 +76,10 @@ int main(int argc, char **argv) {
   catch(const CLI::ParseError &e) {
     return options.exit(e);
   }
-
-  HlsContext context(options.hls);
-  return hlsMain(context);
+
+  if (options.hls) {
+    return hlsMain(HlsContext(options.hls));
+  } else {
+    return simMain(SimContext(options.sim));
+  }
 }