use vectorized memory functions in the base strings

src/base/base_core.c

@@ -692,6 +692,26 @@ u64_array_bsearch(U64 *arr, U64 count, U64 value)
 
 ////////////////////////////////
 
+internal U32
+idx_of_zero_byte64(U8 *ptr, U64 size)
+{
+  Assert(size == 8);
+#if ARCH_X64
+  __m128i v = _mm_loadl_epi64((__m128i*)ptr);
+  __m128i m = _mm_cmpeq_epi8(v, _mm_setzero_si128());
+  U32 bits = _mm_movemask_epi8(m);
+  return ctz32(bits);
+#else
+  U64 x;
+  MemoryCopyStruct(&x, ptr);
+  U64 splat    = ~0ULL / 255;
+  U64 mask_lsb = 0x01 * splat;
+  U64 mask_msb = 0x80 * splat;
+  U64 t = (x - mask_lsb) & (~x & mask_msb);
+  return ctz64(t) / 8;
+#endif
+}
+
 internal U64
 index_of_zero_u32(U32 *ptr, U64 count)
 {

src/base/base_core.h

@@ -1125,6 +1125,7 @@ internal U64 u64_array_bsearch(U64 *arr, U64 count, U64 value);
 
 ////////////////////////////////
 
+internal U32 idx_of_zero_byte64(U8 *ptr, U64 size); // size must be exactly 8 bytes
 internal U64 index_of_zero_u32(U32 *ptr, U64 count);
 internal U64 index_of_zero_u64(U64 *ptr, U64 count);
 internal U64 count_digits_u64(U64 v, U64 radix);

src/base/base_strings.c

@@ -1,6 +1,13 @@
 // Copyright (c) Epic Games Tools
 // Licensed under the MIT license (https://opensource.org/license/mit/)
 
+////////////////////////////////
+
+#if !defined(MEM_STATIC)
+# define MEM_STATIC
+# include "third_party/martins_memfun/memfun.h"
+#endif
+
 ////////////////////////////////
 //~ rjf: Character Classification & Conversion Functions
 
@@ -211,12 +218,9 @@ str32_cstring(U32 *c)
 internal String8
 str8_cstring_capped(void *cstr, void *cap)
 {
-  char *ptr = (char *)cstr;
-  char *opl = (char *)cap;
-  for (;ptr < opl && *ptr != 0; ptr += 1);
-  U64 size = (U64)(ptr - (char *)cstr);
-  String8 result = str8((U8*)cstr, size);
-  return result;
+  U64 cap_size = (U64)((U8 *)cap - (U8 *)cstr);
+  U64 size     = MemFind(cstr, cap_size, 0);
+  return str8(cstr, size);
 }
 
 internal String16
@@ -230,24 +234,6 @@ str16_cstring_capped(void *cstr, void *cap)
   return result;
 }
 
-internal String8
-str8_cstring_capped_reverse(void *raw_start, void *raw_cap)
-{
-  U8 *start = raw_start;
-  U8 *ptr   = raw_cap;
-  for(; ptr > start; )
-  {
-    ptr -= 1;
-    if (*ptr == '\0')
-    {
-      break;
-    }
-  }
-  U64 size = (U64)(ptr - start);
-  String8 result  = str8(start, size);
-  return result;
-}
-
 ////////////////////////////////
 //~ rjf: String Stylization
 
@@ -293,7 +279,11 @@ str8_match(String8 a, String8 b, StringMatchFlags flags)
   B32 result = 0;
   if(a.size == b.size && flags == 0)
   {
-    result = MemoryMatch(a.str, b.str, b.size);
+    result = MemIsEqual(a.str, b.str, b.size);
+  }
+  else if(a.size == b.size && flags == StringMatchFlag_CaseInsensitive)
+  {
+    result = MemCompareI(a.str, b.str, a.size) == 0;
   }
   else if(a.size == b.size || (flags & StringMatchFlag_RightSideSloppy))
   {
@@ -3088,45 +3078,28 @@ str8_deserial_read_sleb128(String8 string, U64 off, S64 *value_out)
 internal int
 str8_compar(String8 a, String8 b, B32 ignore_case)
 {
-  int cmp = 0;
+  int cmp  = 0;
   U64 size = Min(a.size, b.size);
-  if (ignore_case) {
-    for (U64 i = 0; i < size; ++i) {
-      U8 la = lower_from_char(a.str[i]);
-      U8 lb = lower_from_char(b.str[i]);
-      if (la < lb) {
-        cmp = -1;
-        break;
-      } else if (la > lb) {
-        cmp = +1;
-        break;
-      }
-    } 
-  } else {
-    for (U64 i = 0; i < size; ++i) {
-      if (a.str[i] < b.str[i]) {
-        cmp = -1;
-        break;
-      } else if (a.str[i] > b.str[i]) {
-        cmp = +1;
-        break;
-      }
-    } 
+  if (ignore_case)
+  {
+    cmp = MemCompareI(a.str, b.str, size);
+  }
+  else
+  {
+    cmp = MemCompare(a.str, b.str, size);
   }
   
-  if (cmp == 0) {
-    // shorter prefix must precede longer prefixes
-    if (a.size > b.size) {
-      cmp = +1;
-    } else if (b.size > a.size) {
-      cmp = -1;
-    }
+  // shorter prefix must precede longer prefixes
+  if (cmp == 0)
+  {
+    cmp = (a.size > b.size) - (b.size - a.size);
   }
   
   return cmp;
 }
 
-internal int str8_compar_ignore_case(const void *a, const void *b)
+internal int
+str8_compar_ignore_case(const void *a, const void *b)
 {
   return str8_compar(*(String8*)a, *(String8*)b, 1);
 }

src/base/base_strings.h

@@ -185,7 +185,6 @@ internal String16 str16_cstring(U16 *c);
 internal String32 str32_cstring(U32 *c);
 internal String8  str8_cstring_capped(void *cstr, void *cap);
 internal String16 str16_cstring_capped(void *cstr, void *cap);
-internal String8  str8_cstring_capped_reverse(void *raw_start, void *raw_cap);
 
 ////////////////////////////////
 //~ rjf: String Stylization

src/coff/coff.c

@@ -92,13 +92,8 @@ coff_read_symbol_name(String8 string_table, COFF_SymbolName *name)
   if (name->long_name.zeroes == 0) {
     str8_deserial_read_cstr(string_table, name->long_name.string_table_offset, &name_str);
   } else {
-    U32 i;
-    for (i = 0; i < sizeof(name->short_name); ++i) {
-      if (name->short_name[i] == '\0') {
-        break;
-      }
-    }
-    name_str = str8(name->short_name, i);
+    U32 name_size = idx_of_zero_byte64(name->short_name, sizeof(name->short_name));
+    name_str = str8(name->short_name, name_size);
   }
   return name_str;
 }

src/linker/codeview_ext/codeview.c

@@ -142,18 +142,16 @@ cv_type_server_info_from_leaf(CV_Leaf leaf)
   CV_TypeServerInfo result = {0};
   switch (leaf.kind) {
   case CV_LeafKind_TYPESERVER: {
-    CV_LeafTypeServer *ts   = (CV_LeafTypeServer *) leaf.data.str;
-
-    result.name      = str8_cstring_capped_reverse(ts + 1, leaf.data.str + leaf.data.size);
+    CV_LeafTypeServer *ts = (CV_LeafTypeServer *) leaf.data.str;
+    result.name      = str8_cstring_capped(ts + 1, leaf.data.str + leaf.data.size);
     result.sig.data1 = ts->sig;
     result.age       = ts->age;
   } break;
   case CV_LeafKind_TYPESERVER2: {
     CV_LeafTypeServer2 *ts = (CV_LeafTypeServer2 *) leaf.data.str;
-    
     Assert(sizeof(result.sig) == sizeof(ts->sig70));
     MemoryCopy(&result.sig, &ts->sig70, sizeof(ts->sig70));
-    result.name = str8_cstring_capped_reverse(ts + 1, leaf.data.str + leaf.data.size);
+    result.name = str8_cstring_capped(ts + 1, leaf.data.str + leaf.data.size);
     result.age  = ts->age;
   } break;
   case CV_LeafKind_TYPESERVER_ST: {