Use POWER8 accelerated crc32

 - Make accelerated checksum available to InnoDB and XtraDB.
 - Fall back to slice-by-eight if not available. The mode used is printed on startup.
 - Will only build on POWER systems at the moment until CMakeLists are modified
   to only add the crc32_power8/ files when building on POWER.

running MySQL-5.7 unittest/gunit/innodb/ut0crc32-t

Before:

1..2
Using software crc32 implementation, CPU is little-endian
ok 1
Using software crc32 implementation, CPU is little-endian
    normal CRC32: real    0.148006 sec
    normal CRC32: user    0.148000 sec
    normal CRC32: sys     0.000000 sec
big endian CRC32: real    0.144293 sec
big endian CRC32: user    0.144000 sec
big endian CRC32: sys     0.000000 sec
ok 2

After:

1..2
Using POWER8 crc32 implementation, CPU is little-endian
ok 1
Using POWER8 crc32 implementation, CPU is little-endian
    normal CRC32: real    0.008097 sec
    normal CRC32: user    0.008000 sec
    normal CRC32: sys     0.000000 sec
big endian CRC32: real    0.147043 sec
big endian CRC32: user    0.144000 sec
big endian CRC32: sys     0.000000 sec
ok 2

Author CRC32 ASM code: Anton Blanchard <anton@au.ibm.com>
ref: https://github.com/antonblanchard/crc32-vpmsum

Signed-off-by: Daniel Black <daniel.black@au.ibm.com>

extra/CMakeLists.txt

@@ -72,10 +72,15 @@ IF(WITH_INNOBASE_STORAGE_ENGINE OR WITH_XTRADB_STORAGE_ENGINE)
 
   # We use the InnoDB code directly in case the code changes.
   ADD_DEFINITIONS("-DUNIV_INNOCHECKSUM")
+
+  enable_language(ASM)
+
   SET(INNOBASE_SOURCES
       ../storage/innobase/buf/buf0checksum.cc
       ../storage/innobase/ut/ut0crc32.cc
       ../storage/innobase/ut/ut0ut.cc
+      ../storage/innobase/ut/crc32_power8/crc32.S
+      ../storage/innobase/ut/crc32_power8/crc32_wrapper.c
       ../storage/innobase/page/page0zip.cc
       )
 

storage/innobase/CMakeLists.txt

@@ -362,6 +362,7 @@ IF(MSVC)
           PROPERTIES COMPILE_FLAGS "/wd4003")
 ENDIF()
 
+enable_language(ASM)
 
 SET(INNOBASE_SOURCES
 	api/api0api.cc
@@ -477,6 +478,8 @@ SET(INNOBASE_SOURCES
 	ut/ut0bh.cc
 	ut/ut0byte.cc
 	ut/ut0crc32.cc
+	ut/crc32_power8/crc32.S
+	ut/crc32_power8/crc32_wrapper.c
 	ut/ut0dbg.cc
 	ut/ut0list.cc
 	ut/ut0mem.cc

storage/innobase/include/ut0crc32.h

@@ -47,5 +47,6 @@ typedef ib_uint32_t (*ib_ut_crc32_t)(const byte* ptr, ulint len);
 extern ib_ut_crc32_t	ut_crc32;
 
 extern bool	ut_crc32_sse2_enabled;
+extern bool	ut_crc32_power8_enabled;
 
 #endif /* ut0crc32_h */

storage/innobase/srv/srv0start.cc

@@ -1869,9 +1869,13 @@ innobase_start_or_create_for_mysql(void)
 
 	srv_boot();
 
-	ib_logf(IB_LOG_LEVEL_INFO,
-		"%s CPU crc32 instructions",
-		ut_crc32_sse2_enabled ? "Using" : "Not using");
+	if (ut_crc32_sse2_enabled) {
+		ib_logf(IB_LOG_LEVEL_INFO, "Using SSE crc32 instructions");
+	} else if (ut_crc32_power8_enabled) {
+		ib_logf(IB_LOG_LEVEL_INFO, "Using POWER8 crc32 instructions");
+	} else {
+		ib_logf(IB_LOG_LEVEL_INFO, "Using generic crc32 instructions");
+	}
 
 	if (!srv_read_only_mode) {