ggml : remove unused fast broadcast path in GGML_MUL

This was initially added because states were masked with ggml_mul,
but this is no longer done and so this "optimisation" is no longer
necessary, or at least not worth the additional code complexity.

Author: compilade

ggml/src/ggml.c

@@ -10173,37 +10173,7 @@ static void ggml_compute_forward_mul_f32(
     GGML_ASSERT( nb0 == sizeof(float));
     GGML_ASSERT(nb00 == sizeof(float));
 
-    if (ne00 > 1 && ne10 == 1) {
-        // fast broadcast path
-        for (int64_t ir = ith; ir < nr; ir += nth) {
-            // src0 and dst are same shape => same indices
-            const int64_t i03 = ir/(ne02*ne01);
-            const int64_t i02 = (ir - i03*ne02*ne01)/ne01;
-            const int64_t i01 = (ir - i03*ne02*ne01 - i02*ne01);
-
-            const int64_t i13 = i03 % ne13;
-            const int64_t i12 = i02 % ne12;
-            const int64_t i11 = i01 % ne11;
-
-            float * src1_ptr = (float *) ((char *) src1->data + i13*nb13 + i12*nb12 + i11*nb11);
-
-            const float scale = src1_ptr[0];
-
-            if (scale == 0.0f) {
-                // NOTE: this also sets NANs to zero, which is not compliant with IEEE754,
-                //       but it is useful when resetting the state of recurrent models.
-                memset((char *) dst->data + ir*nb1, 0, ne0 * sizeof(float));
-            } else {
-                if (dst->data != src0->data) {
-                    // src0 is same shape as dst => same indices
-                    memcpy((char *) dst->data + ir*nb1, (char *) src0->data + ir*nb01, ne0 * sizeof(float));
-                }
-                if (scale != 1.0f) {
-                    ggml_vec_scale_f32(ne0, (float *) ((char *) dst->data + ir*nb1), scale);
-                }
-            }
-        }
-    } else if (nb10 == sizeof(float)) {
+    if (nb10 == sizeof(float)) {
         for (int64_t ir = ith; ir < nr; ir += nth) {
             // src0 and dst are same shape => same indices
             const int64_t i03 = ir/(ne02*ne01);