From 1ae8eea237f05a590d8da38528dceab8a7b4290b Mon Sep 17 00:00:00 2001
From: Euler Hanzh <18221254@bjtu.edu.cn>
Date: Mon, 17 May 2021 19:28:18 +0800
Subject: [PATCH] This patch is created for performance optimization in crc calculation only suitable for openeuler of aarch64 architecture. 
                 The speed of unzip software when running can be accelerate by nearly 100% than before.

---
 unzip60/crc32.c       |  28 ++++++++++++++++++++++++++++
 unzip60/crc32.h       |   4 ++++
 unzip60/unix/Makefile |  19 ++++++++++++++-----
 3 files changed, 46 insertions(+), 5 deletions(-)

diff --git a/unzip60/crc32.c b/unzip60/crc32.c
index 02f504d..fa73a3e 100644
--- a/unzip60/crc32.c
+++ b/unzip60/crc32.c
@@ -675,7 +675,32 @@ void free_crc_table()

 #endif /* (IZ_CRC_BE_OPTIMIZ || IZ_CRC_LE_OPTIMIZ) */

+#ifdef ARCH_AARCH64
+u_int32_t crc32(u_int32_t crc,const u_int8_t *p, unsigned int len)
+{
+  int64_t length = len;
+
+  while ((length -= sizeof(u_int64_t)) >=0) {
+    __builtin_aarch64_crc32cx(crc, *((u_int64_t *)p));
+    p += sizeof(u_int64_t);
+  }

+  if (length & sizeof(u_int32_t)) {
+    __builtin_aarch64_crc32cw(crc, *((u_int32_t *)p));
+    p += sizeof(u_int32_t);
+  }
+
+  if (length & sizeof(u_int16_t)) {
+    __builtin_aarch64_crc32ch(crc, *((u_int16_t *)p));
+    p += sizeof(u_int16_t);
+  }
+
+  if (length & sizeof(u_int8_t))
+    __builtin_aarch64_crc32cb(crc, *p);
+
+  return crc;
+}
+#else
 /* ========================================================================= */
 ulg crc32(crc, buf, len)
     ulg crc;                    /* crc shift register */
@@ -726,6 +751,9 @@ ulg crc32(crc, buf, len)

   return REV_BE(c) ^ 0xffffffffL;   /* (instead of ~c for 64-bit machines) */
 }
+
+#endif /* !ARCH_AARCH64*/
+
 #endif /* !ASM_CRC */
 #endif /* !CRC_TABLE_ONLY */
 #endif /* !USE_ZLIB */
diff --git a/unzip60/crc32.h b/unzip60/crc32.h
index 83af240..b5e386a 100644
--- a/unzip60/crc32.h
+++ b/unzip60/crc32.h
@@ -36,7 +36,11 @@
 #    undef IZ_CRC_BE_OPTIMIZ
 #  endif
 #else /* !(USE_ZLIB || CRC_TABLE_ONLY) */
+#  ifdef ARCH_AARCH64
+    u_int32_t crc32(u_int32_t crc,const u_int8_t *p, unsigned int len);
+#  else
       ulg      crc32           OF((ulg crc, ZCONST uch *buf, extent len));
+#  endif 
 #endif /* ?(USE_ZLIB || CRC_TABLE_ONLY) */

 #ifndef CRC_32_TAB
diff --git a/unzip60/unix/Makefile b/unzip60/unix/Makefile
index ab32270..39b2263 100644
--- a/unzip60/unix/Makefile
+++ b/unzip60/unix/Makefile
@@ -40,7 +40,8 @@

 # Defaults most systems use (use LOCAL_UNZIP in environment to add flags,
 # such as -DDOSWILD).
-
+TARGET_ARCH = $(shell uname -m)
+ARCH = $(shell getconf LONG_BIT)
 # UnZip flags
 CC = cc#       try using "gcc" target rather than changing this (CC and LD
 LD = $(CC)#    must match, else "unresolved symbol:  ___main" is possible)
@@ -54,6 +55,12 @@ LFLAGS1 =
 LF = -o unzip$E $(LFLAGS1)
 LF2 = -s

+ifeq ($(TARGET_ARCH),aarch64)
+CFF = -DARCH=$(ARCH) -march=armv8.1-a -D ARCH_AARCH64
+else
+CFF =
+endif
+
 # UnZipSFX flags
 SL = -o unzipsfx$E $(LFLAGS1)
 SL2 = $(LF2)
@@ -77,6 +84,8 @@ M = unix
 SHELL = /bin/sh
 MAKEF = -f unix/Makefile

+
+
 # Version info for unix/unix.c
 HOST_VERSINFO=-DIZ_CC_NAME='\"\$$(CC) \"' -DIZ_OS_NAME='\"`uname -a`\"'

@@ -231,13 +240,13 @@ generic_msg:
 # yes, we should be able to use the $O macro to combine these two, but it
 # fails on some brain-damaged makes (e.g., AIX's)...no big deal
 .c.o:
-       $(CC) -c $(CF) $*.c
+       $(CC) -c $(CF) $(CFF)  $*.c

 .c.obj:
-       $(CC) -c $(CF) $*.c
+       $(CC) -c $(CF) $(CFF)  $*.c

 .c.pic.o:
-       $(CC) -c $(CF) -o $@ $*.c
+       $(CC) -c $(CF) $(CFF)  -o $@ $*.c

 # this doesn't work...directories are always a pain with implicit rules
 #.1.txt:               man/$<
@@ -329,7 +338,7 @@ unzipsfx$O: unzip.c $(UNZIP_H) crypt.h unzvers.h consts.h
        $(CC) -c $(CF) -DSFX -o $@ unzip.c

 crc32_$O:      crc32.c $(UNZIP_H) zip.h crc32.h
-       $(CC) -c $(CF) -DSFX -o $@ crc32.c
+       $(CC) -c $(CF) -DSFX $(CFF)  -o $@ crc32.c

 crypt_$O:      crypt.c $(UNZIP_H) zip.h crypt.h crc32.h ttyio.h
        $(CC) -c $(CF) -DSFX -o $@ crypt.c
-- 
2.23.0