Add a conversion for a repro test

include/ck/utility/type_convert.hpp

@@ -978,6 +978,33 @@ inline __host__ __device__ f4x2_t f4_convert_sr(float2_t x, float scale = 1.0f)
 #endif
 }
 
+// convert vector of 2 fp32 to vector of 2 fp4 with sr
+inline __host__ __device__ f4x2_t f4_convert_sr_repro(float2_t x, float scale = 1.0f)
+{
+    constexpr int seed = 1254739;
+    uint32_t rng       = prand_generator<float, seed>(reinterpret_cast<uintptr_t>(&x), x[0]);
+#if defined(__gfx950__)
+    union
+    {
+        uint32_t bitwise;
+        f4x2_t f4x2_array[4];
+    } value{0};
+    value.bitwise = __builtin_amdgcn_cvt_scalef32_sr_pk_fp4_f32(
+        value.bitwise, float2_t{x[1], x[0]}, rng, scale, 0);
+    return value.f4x2_array[0];
+#else
+    union
+    {
+        uint32_t bitwise;
+        f4x2_t f4x2_array[4];
+    } value{0};
+    uint8_t l     = utils::sat_convert_to_type_sr<f4_t>(x[1] / scale, rng);
+    uint8_t h     = utils::sat_convert_to_type_sr<f4_t>(x[0] / scale, rng);
+    value.bitwise = (h << 4) | l;
+    return value.f4x2_array[0];
+#endif
+}
+
 // convert vector of 32 fp32 to vector of 32 fp4 with sr
 inline __host__ __device__ f4x32_t f4_convert_sr(float32_t x, float scale = 1.0f)
 {

test/data_type/test_mx_fp4_repro.cpp

@@ -63,6 +63,23 @@ __host__ __device__ void test_mx_fp32_to_fp4_sr(float* p_test)
 
 __global__ void run_test_mx_fp32_to_fp4_sr(float* p_test) { test_mx_fp32_to_fp4_sr(p_test); }
 
+__host__ __device__ void test_mx_fp32_to_fp4_sr_failing(float* p_test)
+{
+    float2_t f32x2 = {1.0f, -4.0f};
+    auto scale2    = e8m0_bexp_t(2.0f);
+    f4x2_t f4x2 = ck::f4_convert_sr_repro(f32x2, type_convert<float>(scale2)); // expect {0.5, -2}
+
+    p_test[0] = type_convert<float>(
+        f4_t(f4x2.AsType<f4x2_pk_t>()(ck::Number<0>{}).unpack<>(ck::Number<0>{}))); // 0.5f
+    p_test[1] = type_convert<float>(
+        f4_t(f4x2.AsType<f4x2_pk_t>()(ck::Number<0>{}).unpack<>(ck::Number<1>{}))); // -2.0f
+}
+
+__global__ void run_test_mx_fp32_to_fp4_sr_failing(float* p_test)
+{
+    test_mx_fp32_to_fp4_sr_failing(p_test);
+}
+
 TEST(MXFP4, FP4ToFP32)
 {
     std::vector<float> out(2, -1.0f);
@@ -120,3 +137,21 @@ TEST(MXFP4, FP32ToFP4SR)
     EXPECT_EQ(out[0], 0.5f);
     EXPECT_EQ(out[1], -2.0f);
 }
+
+TEST(MXFP4, FP32ToFP4SRFailing)
+{
+    std::vector<float> out(2, -1.0f);
+
+    DeviceMem device_out(2 * sizeof(float));
+    // DeviceMem device_completed(sizeof(uint64_t));
+
+    run_test_mx_fp32_to_fp4_sr_failing<<<1, 1>>>(static_cast<float*>(device_out.GetDeviceBuffer()));
+
+    // uint64_t completed = 0;
+    // device_completed.FromDevice(&completed);
+    device_out.FromDevice(out.data());
+
+    // SR
+    EXPECT_EQ(out[0], 0.5f);
+    EXPECT_EQ(out[1], -2.0f);
+}