$NetBSD$

* Part of patchset to build electron on NetBSD
* Based on OpenBSD's chromium patches, and
  FreeBSD's electron patches

--- third_party/lzma_sdk/C/7zCrcOpt.c.orig	2025-02-24 19:59:26.000000000 +0000
+++ third_party/lzma_sdk/C/7zCrcOpt.c
@@ -1,117 +1,199 @@
-/* 7zCrcOpt.c -- CRC32 calculation
-2021-02-09 : Igor Pavlov : Public domain */
+/* 7zCrcOpt.c -- CRC32 calculation (optimized functions)
+2023-12-07 : Igor Pavlov : Public domain */
 
 #include "Precomp.h"
 
 #include "CpuArch.h"
 
+#if !defined(Z7_CRC_NUM_TABLES) || Z7_CRC_NUM_TABLES > 1
+
+// for debug only : define Z7_CRC_DEBUG_BE to test big-endian code in little-endian cpu
+// #define Z7_CRC_DEBUG_BE
+#ifdef Z7_CRC_DEBUG_BE
+#undef MY_CPU_LE
+#define MY_CPU_BE
+#endif
+
+// the value Z7_CRC_NUM_TABLES_USE must be defined to same value as in 7zCrc.c
+#ifdef Z7_CRC_NUM_TABLES
+#define Z7_CRC_NUM_TABLES_USE  Z7_CRC_NUM_TABLES
+#else
+#define Z7_CRC_NUM_TABLES_USE  12
+#endif
+
+#if Z7_CRC_NUM_TABLES_USE % 4     || \
+    Z7_CRC_NUM_TABLES_USE < 4 * 1 || \
+    Z7_CRC_NUM_TABLES_USE > 4 * 6
+  #error Stop_Compiling_Bad_Z7_CRC_NUM_TABLES
+#endif
+
+
 #ifndef MY_CPU_BE
 
-#define CRC_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8))
+#define CRC_UPDATE_BYTE_2(crc, b)  (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8))
 
-UInt32 MY_FAST_CALL CrcUpdateT4(UInt32 v, const void *data, size_t size, const UInt32 *table);
-UInt32 MY_FAST_CALL CrcUpdateT4(UInt32 v, const void *data, size_t size, const UInt32 *table)
-{
-  const Byte *p = (const Byte *)data;
-  for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)
-    v = CRC_UPDATE_BYTE_2(v, *p);
-  for (; size >= 4; size -= 4, p += 4)
-  {
-    v ^= *(const UInt32 *)(const void *)p;
-    v =
-          (table + 0x300)[((v      ) & 0xFF)]
-        ^ (table + 0x200)[((v >>  8) & 0xFF)]
-        ^ (table + 0x100)[((v >> 16) & 0xFF)]
-        ^ (table + 0x000)[((v >> 24))];
-  }
-  for (; size > 0; size--, p++)
-    v = CRC_UPDATE_BYTE_2(v, *p);
-  return v;
-}
+#define Q(n, d) \
+    ( (table + ((n) * 4 + 3) * 0x100)[(Byte)(d)] \
+    ^ (table + ((n) * 4 + 2) * 0x100)[((d) >> 1 * 8) & 0xFF] \
+    ^ (table + ((n) * 4 + 1) * 0x100)[((d) >> 2 * 8) & 0xFF] \
+    ^ (table + ((n) * 4 + 0) * 0x100)[((d) >> 3 * 8)] )
+
+#define R(a)  *((const UInt32 *)(const void *)p + (a))
+
+#define CRC_FUNC_PRE_LE2(step) \
+UInt32 Z7_FASTCALL CrcUpdateT ## step (UInt32 v, const void *data, size_t size, const UInt32 *table)
 
-UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const UInt32 *table);
-UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const UInt32 *table)
+#define CRC_FUNC_PRE_LE(step)   \
+        CRC_FUNC_PRE_LE2(step); \
+        CRC_FUNC_PRE_LE2(step)
+
+CRC_FUNC_PRE_LE(Z7_CRC_NUM_TABLES_USE)
 {
   const Byte *p = (const Byte *)data;
-  for (; size > 0 && ((unsigned)(ptrdiff_t)p & 7) != 0; size--, p++)
+  const Byte *lim;
+  for (; size && ((unsigned)(ptrdiff_t)p & (7 - (Z7_CRC_NUM_TABLES_USE & 4))) != 0; size--, p++)
     v = CRC_UPDATE_BYTE_2(v, *p);
-  for (; size >= 8; size -= 8, p += 8)
+  lim = p + size;
+  if (size >= Z7_CRC_NUM_TABLES_USE)
   {
-    UInt32 d;
-    v ^= *(const UInt32 *)(const void *)p;
-    v =
-          (table + 0x700)[((v      ) & 0xFF)]
-        ^ (table + 0x600)[((v >>  8) & 0xFF)]
-        ^ (table + 0x500)[((v >> 16) & 0xFF)]
-        ^ (table + 0x400)[((v >> 24))];
-    d = *((const UInt32 *)(const void *)p + 1);
-    v ^=
-          (table + 0x300)[((d      ) & 0xFF)]
-        ^ (table + 0x200)[((d >>  8) & 0xFF)]
-        ^ (table + 0x100)[((d >> 16) & 0xFF)]
-        ^ (table + 0x000)[((d >> 24))];
+    lim -= Z7_CRC_NUM_TABLES_USE;
+    do
+    {
+      v ^= R(0);
+      {
+#if Z7_CRC_NUM_TABLES_USE == 1 * 4
+        v = Q(0, v);
+#else
+#define U2(r, op) \
+        { d = R(r);  x op Q(Z7_CRC_NUM_TABLES_USE / 4 - 1 - (r), d); }
+        UInt32 d, x;
+        U2(1, =)
+#if Z7_CRC_NUM_TABLES_USE >= 3 * 4
+#define U(r)  U2(r, ^=)
+        U(2)
+#if Z7_CRC_NUM_TABLES_USE >= 4 * 4
+        U(3)
+#if Z7_CRC_NUM_TABLES_USE >= 5 * 4
+        U(4)
+#if Z7_CRC_NUM_TABLES_USE >= 6 * 4
+        U(5)
+#if Z7_CRC_NUM_TABLES_USE >= 7 * 4
+#error Stop_Compiling_Bad_Z7_CRC_NUM_TABLES
+#endif
+#endif
+#endif
+#endif
+#endif
+#undef U
+#undef U2
+        v = x ^ Q(Z7_CRC_NUM_TABLES_USE / 4 - 1, v);
+#endif
+      }
+      p += Z7_CRC_NUM_TABLES_USE;
+    }
+    while (p <= lim);
+    lim += Z7_CRC_NUM_TABLES_USE;
   }
-  for (; size > 0; size--, p++)
+  for (; p < lim; p++)
     v = CRC_UPDATE_BYTE_2(v, *p);
   return v;
 }
 
+#undef CRC_UPDATE_BYTE_2
+#undef R
+#undef Q
+#undef CRC_FUNC_PRE_LE
+#undef CRC_FUNC_PRE_LE2
+
 #endif
 
 
+
+
 #ifndef MY_CPU_LE
 
-#define CRC_UINT32_SWAP(v) ((v >> 24) | ((v >> 8) & 0xFF00) | ((v << 8) & 0xFF0000) | (v << 24))
+#define CRC_UPDATE_BYTE_2_BE(crc, b)  (table[((crc) >> 24) ^ (b)] ^ ((crc) << 8))
 
-#define CRC_UPDATE_BYTE_2_BE(crc, b) (table[(((crc) >> 24) ^ (b))] ^ ((crc) << 8))
+#define Q(n, d) \
+    ( (table + ((n) * 4 + 0) * 0x100)[((d)) & 0xFF] \
+    ^ (table + ((n) * 4 + 1) * 0x100)[((d) >> 1 * 8) & 0xFF] \
+    ^ (table + ((n) * 4 + 2) * 0x100)[((d) >> 2 * 8) & 0xFF] \
+    ^ (table + ((n) * 4 + 3) * 0x100)[((d) >> 3 * 8)] )
+
+#ifdef Z7_CRC_DEBUG_BE
+  #define R(a)  GetBe32a((const UInt32 *)(const void *)p + (a))
+#else
+  #define R(a)         *((const UInt32 *)(const void *)p + (a))
+#endif
 
-UInt32 MY_FAST_CALL CrcUpdateT1_BeT4(UInt32 v, const void *data, size_t size, const UInt32 *table)
-{
-  const Byte *p = (const Byte *)data;
-  table += 0x100;
-  v = CRC_UINT32_SWAP(v);
-  for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)
-    v = CRC_UPDATE_BYTE_2_BE(v, *p);
-  for (; size >= 4; size -= 4, p += 4)
-  {
-    v ^= *(const UInt32 *)(const void *)p;
-    v =
-          (table + 0x000)[((v      ) & 0xFF)]
-        ^ (table + 0x100)[((v >>  8) & 0xFF)]
-        ^ (table + 0x200)[((v >> 16) & 0xFF)]
-        ^ (table + 0x300)[((v >> 24))];
-  }
-  for (; size > 0; size--, p++)
-    v = CRC_UPDATE_BYTE_2_BE(v, *p);
-  return CRC_UINT32_SWAP(v);
-}
 
-UInt32 MY_FAST_CALL CrcUpdateT1_BeT8(UInt32 v, const void *data, size_t size, const UInt32 *table)
+#define CRC_FUNC_PRE_BE2(step) \
+UInt32 Z7_FASTCALL CrcUpdateT1_BeT ## step (UInt32 v, const void *data, size_t size, const UInt32 *table)
+
+#define CRC_FUNC_PRE_BE(step)   \
+        CRC_FUNC_PRE_BE2(step); \
+        CRC_FUNC_PRE_BE2(step)
+
+CRC_FUNC_PRE_BE(Z7_CRC_NUM_TABLES_USE)
 {
   const Byte *p = (const Byte *)data;
+  const Byte *lim;
   table += 0x100;
-  v = CRC_UINT32_SWAP(v);
-  for (; size > 0 && ((unsigned)(ptrdiff_t)p & 7) != 0; size--, p++)
+  v = Z7_BSWAP32(v);
+  for (; size && ((unsigned)(ptrdiff_t)p & (7 - (Z7_CRC_NUM_TABLES_USE & 4))) != 0; size--, p++)
     v = CRC_UPDATE_BYTE_2_BE(v, *p);
-  for (; size >= 8; size -= 8, p += 8)
+  lim = p + size;
+  if (size >= Z7_CRC_NUM_TABLES_USE)
   {
-    UInt32 d;
-    v ^= *(const UInt32 *)(const void *)p;
-    v =
-          (table + 0x400)[((v      ) & 0xFF)]
-        ^ (table + 0x500)[((v >>  8) & 0xFF)]
-        ^ (table + 0x600)[((v >> 16) & 0xFF)]
-        ^ (table + 0x700)[((v >> 24))];
-    d = *((const UInt32 *)(const void *)p + 1);
-    v ^=
-          (table + 0x000)[((d      ) & 0xFF)]
-        ^ (table + 0x100)[((d >>  8) & 0xFF)]
-        ^ (table + 0x200)[((d >> 16) & 0xFF)]
-        ^ (table + 0x300)[((d >> 24))];
+    lim -= Z7_CRC_NUM_TABLES_USE;
+    do
+    {
+      v ^= R(0);
+      {
+#if Z7_CRC_NUM_TABLES_USE == 1 * 4
+        v = Q(0, v);
+#else
+#define U2(r, op) \
+        { d = R(r);  x op Q(Z7_CRC_NUM_TABLES_USE / 4 - 1 - (r), d); }
+        UInt32 d, x;
+        U2(1, =)
+#if Z7_CRC_NUM_TABLES_USE >= 3 * 4
+#define U(r)  U2(r, ^=)
+        U(2)
+#if Z7_CRC_NUM_TABLES_USE >= 4 * 4
+        U(3)
+#if Z7_CRC_NUM_TABLES_USE >= 5 * 4
+        U(4)
+#if Z7_CRC_NUM_TABLES_USE >= 6 * 4
+        U(5)
+#if Z7_CRC_NUM_TABLES_USE >= 7 * 4
+#error Stop_Compiling_Bad_Z7_CRC_NUM_TABLES
+#endif
+#endif
+#endif
+#endif
+#endif
+#undef U
+#undef U2
+        v = x ^ Q(Z7_CRC_NUM_TABLES_USE / 4 - 1, v);
+#endif
+      }
+      p += Z7_CRC_NUM_TABLES_USE;
+    }
+    while (p <= lim);
+    lim += Z7_CRC_NUM_TABLES_USE;
   }
-  for (; size > 0; size--, p++)
+  for (; p < lim; p++)
     v = CRC_UPDATE_BYTE_2_BE(v, *p);
-  return CRC_UINT32_SWAP(v);
+  return Z7_BSWAP32(v);
 }
 
+#undef CRC_UPDATE_BYTE_2_BE
+#undef R
+#undef Q
+#undef CRC_FUNC_PRE_BE
+#undef CRC_FUNC_PRE_BE2
+
+#endif
+#undef Z7_CRC_NUM_TABLES_USE
 #endif