fix mma_tensorcore (#48386)

* fix mma_tensorcore (__CUDA_ARCH__)

* disable tensorcore by default.

disable tensorcore by default, because the judgment of __CUDA_ARCH__ will cause undefined behavior in some environments, can manually enable it on a machine that supports tensorcore.

paddle/fluid/operators/fused/fused_multi_transformer_op.cu.h

@@ -95,7 +95,7 @@ using float16 = plat::float16;
 #define MMHA_USE_FP32_ACUM_FOR_LOGITS
 #define MMHA_USE_FP32_ACUM_FOR_OUT
 #define MMHA_USE_FP32_ACUM_FOR_FMA
-#define MMHA_USE_HMMA_FOR_REDUCTION
+// #define MMHA_USE_HMMA_FOR_REDUCTION
 
 template <typename D>
 class PDDataTypeTraits;
@@ -601,7 +601,8 @@ template <int N>
 inline __device__ float qk_hmma_dot_(const uint32_t (&q)[N],
                                      const uint32_t (&k)[N],
                                      float inv_sqrt_dh) {
-#if defined(__CUDA_ARCH__) && __CUDA_ARCH__ >= 750
+#if defined(MMHA_USE_HMMA_FOR_REDUCTION) && defined(__CUDA_ARCH__) && \
+    __CUDA_ARCH__ >= 750
 #ifdef MMHA_USE_FP32_ACUM_FOR_FMA
   using K_vec_acum = typename K_vec_acum_fp32_<uint32_t>::Type;
 #else
@@ -641,7 +642,8 @@ struct Qk_dot<float16, 4> {
   static inline __device__ float dot(const uint32_t (&q)[N],
                                      const uint32_t (&k)[N],
                                      float inv_sqrt_dh) {
-#if defined(MMHA_USE_HMMA_FOR_REDUCTION) && __CUDA_ARCH__ >= 750
+#if defined(MMHA_USE_HMMA_FOR_REDUCTION) && defined(__CUDA_ARCH__) && \
+    __CUDA_ARCH__ >= 750
     return qk_hmma_dot_(q, k, inv_sqrt_dh);
 #else
     return qk_dot_<4>(q, k, inv_sqrt_dh);
@@ -1104,7 +1106,8 @@ void fmha_launch_kernel(const Masked_multihead_attention_params<T> &params,
   if (params.timestep < 32) {
     MMHA_LAUNCH_KERNEL(T, Dh, Dh_MAX, 4, THREADS_PER_VALUE, 64, stream);
   } else if (params.timestep < 2048) {
-#if defined(MMHA_USE_HMMA_FOR_REDUCTION) && __CUDA_ARCH__ >= 750
+#if defined(MMHA_USE_HMMA_FOR_REDUCTION) && defined(__CUDA_ARCH__) && \
+    __CUDA_ARCH__ >= 750
     MMHA_LAUNCH_KERNEL(T, Dh, Dh_MAX, 4, THREADS_PER_VALUE, 256, stream);
 #else
     MMHA_LAUNCH_KERNEL(T, Dh, Dh_MAX, 2, THREADS_PER_VALUE, 128, stream);