From 6210c2007a430882d234d846d133d5f3799434aa Mon Sep 17 00:00:00 2001
From: Euler Hanzh <18221254@bjtu.edu.cn>
Date: Mon, 17 May 2021 17:32:51 +0800
Subject: [PATCH] this patch is created for performance optimization in crc calculation only suitable for openeuler of aarch64 architecture. 
                 The speed of zip software when running can be accelerate by nearly 20% than before.
                 
---
 zip30/crc32.c       | 27 +++++++++++++++++++++++++++
 zip30/crc32.h       |  4 ++++
 zip30/unix/Makefile | 13 +++++++++++--
 3 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/zip30/crc32.c b/zip30/crc32.c
index 6b2403b..9e26af7 100644
--- a/zip30/crc32.c
+++ b/zip30/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 +751,8 @@ 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/zip30/crc32.h b/zip30/crc32.h
index 83af240..6fdaf32 100644
--- a/zip30/crc32.h
+++ b/zip30/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/zip30/unix/Makefile b/zip30/unix/Makefile
index abd0c44..065395a 100644
--- a/zip30/unix/Makefile
+++ b/zip30/unix/Makefile
@@ -37,6 +37,9 @@ CHMOD = chmod
 BINFLAGS = 755
 MANFLAGS = 644

+
+TARGET_ARCH = $(shell uname -m)
+ARCH = $(shell getconf LONG_BIT)
 # target directories - where to install executables and man pages to
 prefix = /usr/local
 BINDIR = $(prefix)/bin
@@ -59,6 +62,12 @@ IZ_OUR_BZIP2_DIR = bzip2
 #   LFLAGS2   flags after obj file list (libraries, etc)
 CFLAGS_NOOPT = -I. -DUNIX $(LOCAL_ZIP)
 CFLAGS = -O2 $(CFLAGS_NOOPT)
+ifeq ($(TARGET_ARCH),aarch64)
+CFF = -DARCH=$(ARCH) -march=armv8.1-a -D ARCH_AARCH64
+else
+CFF =
+endif
+
 LFLAGS1 =
 LFLAGS2 = -s

@@ -80,10 +89,10 @@ ZIP_H = zip.h ziperr.h tailor.h unix/osdep.h
 .SUFFIXES:
 .SUFFIXES: _.o .o .c .doc .1
 .c_.o:
-       $(CC) -c $(CFLAGS) -DUTIL -o $@ $<
+       $(CC) -c $(CFLAGS) -DUTIL $(CFF)  -o $@ $<

 .c.o:
-       $(CC) -c $(CFLAGS) $<
+       $(CC) -c $(CFLAGS) $(CFF) $<

 .1.doc:
        nroff -man $< | col -bx | uniq > $@
-- 
2.23.0