build: fix GN configuration for deps/base64

PR-URL: #50696 Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Marco Ippolito <[email protected]> Reviewed-By: Jiawen Geng <[email protected]>

Author: zcbenz

deps/base64/unofficial.gni

@@ -32,6 +32,7 @@ template("base64_gn_build"){
 "HAVE_SSE42=1",
 "HAVE_AVX=1",
 "HAVE_AVX2=1",
+"HAVE_AVX512=1",
  ]
  }
 if (target_cpu=="arm"){
@@ -65,6 +66,7 @@ template("base64_gn_build"){
 ":base64_sse42",
 ":base64_avx",
 ":base64_avx2",
+":base64_avx512",
 ":base64_neon32",
 ":base64_neon64",
  ]
@@ -111,6 +113,7 @@ template("base64_gn_build"){
  }
  }
  }
+
 source_set("base64_avx2"){
 configs+= [ ":base64_internal_config" ]
 sources= [ "base64/lib/arch/avx2/codec.c" ]
@@ -123,6 +126,21 @@ template("base64_gn_build"){
  }
  }
 
+source_set("base64_avx512"){
+configs+= [ ":base64_internal_config" ]
+sources= [ "base64/lib/arch/avx512/codec.c" ]
+if (target_cpu=="x86"||target_cpu=="x64"){
+if (is_clang||!is_win){
+cflags_c= [
+"-mavx512vl",
+"-mavx512vbmi",
+ ]
+ } elseif (is_win){
+cflags_c= [ "/arch:AVX512" ]
+ }
+ }
+ }
+
 source_set("base64_neon32"){
 configs+= [ ":base64_internal_config" ]
 sources= [ "base64/lib/arch/neon32/codec.c" ]