src: replace custom ASCII validation with simdutf one

PR-URL: #46271 Reviewed-By: Tobias Nießen <[email protected]> Reviewed-By: Richard Lau <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Darshan Sen <[email protected]>

Author: addaleax

src/string_bytes.cc

@@ -25,6 +25,7 @@
 #include"env-inl.h"
 #include"node_buffer.h"
 #include"node_errors.h"
+#include"simdutf.h"
 #include"util.h"
 
 #include<climits>
@@ -467,60 +468,6 @@ Maybe<size_t> StringBytes::Size(Isolate* isolate,
 UNREACHABLE();
 }
 
-
-
-
-staticboolcontains_non_ascii_slow(constchar* buf, size_t len){
-for (size_t i = 0; i < len; ++i){
-if (buf[i] & 0x80)
-returntrue;
- }
-returnfalse;
-}
-
-
-staticboolcontains_non_ascii(constchar* src, size_t len){
-if (len < 16){
-returncontains_non_ascii_slow(src, len);
- }
-
-constunsigned bytes_per_word = sizeof(uintptr_t);
-constunsigned align_mask = bytes_per_word - 1;
-constunsigned unaligned = reinterpret_cast<uintptr_t>(src) & align_mask;
-
-if (unaligned > 0){
-constunsigned n = bytes_per_word - unaligned;
-if (contains_non_ascii_slow(src, n))
-returntrue;
- src += n;
- len -= n;
- }
-
-
-#if defined(_WIN64) || defined(_LP64)
-constuintptr_t mask = 0x8080808080808080ll;
-#else
-constuintptr_t mask = 0x80808080l;
-#endif
-
-constuintptr_t* srcw = reinterpret_cast<constuintptr_t*>(src);
-
-for (size_t i = 0, n = len / bytes_per_word; i < n; ++i){
-if (srcw[i] & mask)
-returntrue;
- }
-
-constunsigned remainder = len & align_mask;
-if (remainder > 0){
-constsize_t offset = len - remainder;
-if (contains_non_ascii_slow(src + offset, remainder))
-returntrue;
- }
-
-returnfalse;
-}
-
-
 staticvoidforce_ascii_slow(constchar* src, char* dst, size_t len){
 for (size_t i = 0; i < len; ++i){
  dst[i] = src[i] & 0x7f;
@@ -634,7 +581,8 @@ MaybeLocal<Value> StringBytes::Encode(Isolate* isolate,
  }
 
 case ASCII:
-if (contains_non_ascii(buf, buflen)){
+if (simdutf::validate_ascii_with_errors(buf, buflen).error){
+// The input contains non-ASCII bytes.
 char* out = node::UncheckedMalloc(buflen);
 if (out == nullptr){
  *error = node::ERR_MEMORY_ALLOCATION_FAILED(isolate);