vulkan: fix rms_norm_mul to handle broadcasting dim0 (ggml-org#14817)

Author: jeffbolznv

ggml/src/ggml-vulkan/ggml-vulkan.cpp

@@ -10248,7 +10248,7 @@ static bool ggml_vk_can_fuse(const struct ggml_cgraph * cgraph, int node_idx, st
         }
         // if rms_norm is the B operand, then we don't handle broadcast
         if (rms_norm == mul->src[1] &&
-            mul->src[0]->ne[1] != rms_norm->ne[1]) {
+            !ggml_are_same_shape(mul->src[0], rms_norm)) {
             return false;
         }
         // rms_norm shader assumes contiguous rows

ggml/src/ggml-vulkan/vulkan-shaders/rms_norm.comp

@@ -50,8 +50,14 @@ void main() {
     const FLOAT_TYPE scale = inversesqrt(mean + FLOAT_TYPE(p.param1));
 
     if (do_multiply) {
-        [[unroll]] for (uint col = tid; col < ncols; col += BLOCK_SIZE) {
-            data_d[d_offset + col] = D_TYPE(scale * FLOAT_TYPE(data_a[a_offset + col]) * FLOAT_TYPE(data_b[b_offset + col]));
+        if (ncols > p.ne10) {
+            [[unroll]] for (uint col = tid; col < ncols; col += BLOCK_SIZE) {
+                data_d[d_offset + col] = D_TYPE(scale * FLOAT_TYPE(data_a[a_offset + col]) * FLOAT_TYPE(data_b[b_offset + fastmod(col, p.ne10)]));
+            }
+        } else {
+            [[unroll]] for (uint col = tid; col < ncols; col += BLOCK_SIZE) {
+                data_d[d_offset + col] = D_TYPE(scale * FLOAT_TYPE(data_a[a_offset + col]) * FLOAT_TYPE(data_b[b_offset + col]));
+            }
         }
     } else {
         [[unroll]] for (uint col = tid; col < ncols; col += BLOCK_SIZE) {