[gn] Test building AVX-512

Because we don't test it in Github Actions, AVX-512 support
has bit-rotted in GN a bit. Should take care of a cluster of
failures in the latest Chrome integration attempt. [1]

[1] https://chromium-review.googlesource.com/c/chromium/src/+/7615883?tab=checks

PiperOrigin-RevId: 915679173

Author: Sentimentron

.github/workflows/build.yml

@@ -381,10 +381,17 @@ jobs:
           git cl format --presubmit --no-clang-format --no-python --diff
         working-directory: ${{ github.workspace }}/xnnpack
       - name: Generate build files
+        run: |
+          gn gen --check --args="is_debug=false clang_use_chrome_plugins=false dcheck_always_on=true cc_wrapper=\"ccache\" symbol_level=0 xnnpack_enable_avx512=true target_cpu=\"x64\" use_siso=true" out/x64.dchecks
+        working-directory: ${{ github.workspace }}/xnnpack
+      - name: Build all targets (Release + debug checks, with AVX512)
+        run: |
+          autoninja -C out/x64.dchecks
+      - name: Generate build files (no AVX512)
         run: |
           gn gen --check --args="is_debug=false clang_use_chrome_plugins=false dcheck_always_on=true cc_wrapper=\"ccache\" symbol_level=0 xnnpack_enable_avx512=false target_cpu=\"x64\" use_siso=true" out/x64.dchecks
         working-directory: ${{ github.workspace }}/xnnpack
-      - name: Build all targets (Release + debug checks)
+      - name: Build all targets (Release + debug checks, without AVX512)
         run: |
           autoninja -C out/x64.dchecks
         working-directory: ${{ github.workspace }}/xnnpack

BUILD.gn

@@ -51,6 +51,7 @@ import("gen/avx256vnni_microkernels.bzl")
 import("gen/avx256vnnigfni_microkernels.bzl")
 import("gen/avx2_microkernels.bzl")
 import("gen/avx512amx_microkernels.bzl")
+import("gen/avx512bf16_microkernels.bzl")
 import("gen/avx512f_microkernels.bzl")
 import("gen/avx512fp16_microkernels.bzl")
 import("gen/avx512skx_microkernels.bzl")
@@ -601,6 +602,7 @@ if (current_cpu == "x64" || current_cpu == "x86") {
     sources += ALL_AVX512F_MICROKERNEL_SRCS
     sources += ALL_AVX512FP16_MICROKERNEL_SRCS
     sources += ALL_AVX512AMX_MICROKERNEL_SRCS
+    sources += ALL_AVX512BF16_MICROKERNEL_SRCS
     sources += ALL_AVX512SKX_MICROKERNEL_SRCS
     sources += ALL_AVX512VBMI_MICROKERNEL_SRCS
 
@@ -1135,7 +1137,7 @@ xnnpack_test("operators") {
 # Benchmarks
 #
 if (!build_with_chromium) {
-  # XNNPACK's benchmarks don't seem to build agains the Google benchmark in
+  # XNNPACK's benchmarks don't seem to build against the Google benchmark in
   # Chromium. TODO: figure out why.
   xnnpack_source_set("benchmark_test_support") {
     testonly = true