vulkan: extend PTQ1_0 fast integer-dot path to INTEL_XE1 iGPUs (Arrow Lake-H)

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

@@ -9573,12 +9573,17 @@ static bool ggml_vk_should_use_mmvq(const vk_device& device, uint32_t m, uint32_
             return true;
         }
     case VK_VENDOR_ID_INTEL:
-        if (device->architecture == vk_device_architecture::INTEL_XE2) {
+        if (device->architecture == vk_device_architecture::INTEL_XE2 ||
+            (device->architecture == vk_device_architecture::INTEL_XE1 && device->integer_dot_product && src0_type == GGML_TYPE_PTQ1_0)) {
             // PTQ1_0 is listed here because it has a dedicated integer-dot mat-vec shader
             // (mul_mat_vecq_ptq1_0.comp); without it the blanket Intel-Windows opt-out below
             // keeps PTQ1_0 on the dequant path. Measured on Arc B390 (Bonsai 2 27B, tg128):
             // 1.62 -> 13.16 t/s. PQ2_0 is deliberately NOT listed - measured 11.56 -> 11.63 t/s,
             // i.e. no gain over its dequant mat-vec, so it stays on the existing path.
+            // INTEL_XE1-classified iGPUs (e.g. Intel Arc 140T, Arrow Lake-H, Xe-LPG+) also
+            // qualify for PTQ1_0 when integer_dot_product is set, since that classification
+            // already guarantees the accelerated 4x8 integer dot product the shader needs.
+            // Measured on Arc 140T (Bonsai 2 27B, tg): 1.3 -> 8.8 t/s.
             if (src0_type == GGML_TYPE_Q2_0 || src0_type == GGML_TYPE_Q2_K || src0_type == GGML_TYPE_Q3_K || src0_type == GGML_TYPE_Q6_K ||
                 src0_type == GGML_TYPE_PTQ1_0) {
                 return true;