1 files changed, 123 insertions, 0 deletions
diff --git a/llama.cpp/ggml/src/ggml-webgpu/wgsl-shaders/rms_norm.wgsl b/llama.cpp/ggml/src/ggml-webgpu/wgsl-shaders/rms_norm.wgsl
new file mode 100644
index 0000000..712b921
--- /dev/null
+++ b/llama.cpp/ggml/src/ggml-webgpu/wgsl-shaders/rms_norm.wgsl
@@ -0,0 +1,123 @@
+#define(VARIANTS)
+
+[
+  {
+    "DECLS": ["NOT_INPLACE"]
+  },
+  {
+    "SHADER_SUFFIX": "inplace",
+    "DECLS": ["INPLACE"]
+  },
+]
+
+#end(VARIANTS)
+
+#define(DECLS)
+
+#decl(NOT_INPLACE)
+
+fn update(src_offset: u32, dst_offset: u32, scale: f32) {
+    dst[dst_offset] = scale * src[src_offset];
+}
+
+@group(0) @binding(1)
+var<storage, read_write> dst: array<f32>;
+
+@group(0) @binding(2)
+var<uniform> params: Params;
+
+#enddecl(NOT_INPLACE)
+
+#decl(INPLACE)
+
+fn update(src_offset: u32, dst_offset: u32, scale: f32) {
+    src[dst_offset] = scale * src[src_offset];
+}
+
+@group(0) @binding(1)
+var<uniform> params: Params;
+
+#enddecl(INPLACE)
+
+#end(DECLS)
+
+#define(SHADER)
+
+struct Params {
+    offset_src: u32, // in elements
+    offset_dst: u32, // in elements
+
+    // Strides (in elements)
+    stride_src1: u32,
+    stride_src2: u32,
+    stride_src3: u32,
+
+    stride_dst1: u32,
+    stride_dst2: u32,
+    stride_dst3: u32,
+
+    // Shape of src/dst
+    ne0: u32,
+    ne1: u32,
+    ne2: u32,
+    ne3: u32,
+
+    eps: f32
+};
+
+@group(0) @binding(0)
+var<storage, read_write> src: array<f32>;
+
+DECLS
+
+override wg_size: u32;
+var<workgroup> scratch: array<f32, wg_size>;
+
+@compute @workgroup_size(wg_size)
+fn main(@builtin(workgroup_id) wid: vec3<u32>,
+        @builtin(local_invocation_id) lid: vec3<u32>) {
+
+    // one thread per row
+    var i = wid.x;
+    let i3 = i / (params.ne2 * params.ne1);
+    i = i % (params.ne2 * params.ne1);
+    let i2 = i / params.ne1;
+    let i1 = i % params.ne1;
+    let i_src_row = params.offset_src + i3 * params.stride_src3 + i2 * params.stride_src2 + i1 * params.stride_src1;
+    let i_dst_row = params.offset_dst + i3 * params.stride_dst3 + i2 * params.stride_dst2 + i1 * params.stride_dst1;
+
+    let elems = (params.ne0 + wg_size - 1) / wg_size;
+
+    var sum = 0.0f;
+    var col = lid.x;
+    for (var j: u32 = 0; j < elems; j++) {
+        if (col >= params.ne0) {
+            break;
+        }
+        sum += pow(src[i_src_row + col], 2.0);
+        col += wg_size;
+    }
+
+    scratch[lid.x] = sum;
+    workgroupBarrier();
+    var offset = wg_size / 2;
+    while (offset > 0) {
+        if (lid.x < offset) {
+            scratch[lid.x] += scratch[lid.x + offset];
+        }
+        offset = offset / 2;
+        workgroupBarrier();
+    }
+    sum = scratch[0];
+
+    let scale = 1.0/sqrt(sum/f32(params.ne0) + params.eps);
+    col = lid.x;
+    for (var j: u32 = 0; j < elems; j++) {
+        if (col >= params.ne0) {
+            break;
+        }
+        update(i_src_row + col, i_dst_row + col, scale);
+        col += wg_size;
+    }
+}
+#end(SHADER)