Initial release

engine/tests/test-philox.cpp

@@ -0,0 +1,34 @@
+// test-philox.cpp
+// Dump Philox noise to binary file for comparison with PyTorch CUDA.
+// Build: make (see Makefile)
+// Usage: ./test-philox [seed] [count] [output.f32]
+#include "philox.h"
+
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+
+int main(int argc, char ** argv) {
+    if (argc > 1 && (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0)) {
+        fprintf(stderr, "usage: %s [seed=42] [count=48000] [output=philox-noise.f32]\n", argv[0]);
+        return 0;
+    }
+    int64_t      seed  = argc > 1 ? atoll(argv[1]) : 42;
+    int          count = argc > 2 ? atoi(argv[2]) : 48000;
+    const char * path  = argc > 3 ? argv[3] : "philox-noise.f32";
+
+    float * out = new float[count];
+    philox_randn(seed, out, count, true);
+
+    FILE * f = fopen(path, "wb");
+    if (!f) {
+        fprintf(stderr, "cannot open %s\n", path);
+        return 1;
+    }
+    fwrite(out, sizeof(float), count, f);
+    fclose(f);
+    delete[] out;
+
+    fprintf(stderr, "wrote %d floats (seed=%lld) to %s\n", count, (long long) seed, path);
+    return 0;
+}