add casting (#7)

CMakeLists.txt

@@ -51,7 +51,7 @@ foreach(EXAMPLE_SOURCE ${EXAMPLE_SOURCES})
 
     # CUDA properties provided by CMAKE
     set_target_properties(${EXAMPLE_NAME} PROPERTIES CUDA_SEPARABLE_COMPILATION ON)
-    set_target_properties(${EXAMPLE_NAME} PROPERTIES CUDA_ARCHITECTURES 90a)
+    set_target_properties(${EXAMPLE_NAME} PROPERTIES CUDA_ARCHITECTURES 100)
 
     # Convert the flags string into a list of flags
     separate_arguments(EXTRA_CUDA_FLAGS_LIST UNIX_COMMAND "${EXTRA_CUDA_FLAGS}")

examples/mx/num_to_ue8mo.cu

@@ -0,0 +1,56 @@
+#include <cuda_fp8.h>
+#include <stdio.h>
+
+__global__ void convert_to_e8m0(float *in, __nv_fp8_storage_t *out) {
+  const float input_val = in[0];
+  printf("Device input value: %f\n", input_val);
+  __nv_fp8_storage_t result =
+      __nv_cvt_float_to_e8m0(input_val, __NV_SATFINITE, cudaRoundNearest);
+  printf("Device output value (hex): 0x%02x, (decimal): %u\n",
+         (unsigned char)result, (unsigned char)result);
+  out[0] = result;
+}
+
+int main() {
+  float h_in = 1.0f / 448.0f;
+  float *d_in;
+  __nv_fp8_storage_t *d_out, h_out;
+
+  cudaMalloc(&d_in, sizeof(float));
+  cudaMalloc(&d_out, sizeof(__nv_fp8_storage_t));
+
+  cudaError_t err =
+      cudaMemcpy(d_in, &h_in, sizeof(float), cudaMemcpyHostToDevice);
+  if (err != cudaSuccess) {
+    printf("Memcpy error: %s\n", cudaGetErrorString(err));
+    return 1;
+  }
+
+  convert_to_e8m0<<<1, 1>>>(d_in, d_out);
+  cudaDeviceSynchronize(); // Need this to see printf from kernel
+  err = cudaGetLastError();
+  if (err != cudaSuccess) {
+    printf("Kernel error: %s\n", cudaGetErrorString(err));
+    return 1;
+  }
+
+  err = cudaMemcpy(&h_out, d_out, sizeof(__nv_fp8_storage_t),
+                   cudaMemcpyDeviceToHost);
+  if (err != cudaSuccess) {
+    printf("Memcpy error: %s\n", cudaGetErrorString(err));
+    return 1;
+  }
+
+  printf("Host input float: %f\n", h_in);
+  printf("Host output e8m0 hex: 0x%02x, decimal: %u\n", (unsigned char)h_out,
+         (unsigned char)h_out);
+  printf("Host output e8m0 bits: ");
+  for (int i = 7; i >= 0; i--) {
+    printf("%d", (h_out >> i) & 0x1);
+  }
+  printf("\n");
+
+  cudaFree(d_in);
+  cudaFree(d_out);
+  return 0;
+}