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Eliminate the separate 'len' variable from the loops, and also use the 4 byte instruction. This shaves off a few more cycles. Even though this routine that uses the special SSE 4.2 instructions is much faster than a generic routine, it's still a hot spot, so let's make it as fast as possible. Change the configure test to not test _mm_crc32_u64. That variant is only available in the 64-bit x86-64 architecture, not in 32-bit x86. Modify pg_comp_crc32c_sse42 so that it only uses _mm_crc32_u64 on x86-64. With these changes, the SSE accelerated CRC-32C implementation can also be used on 32-bit x86 systems. This also fixes the 32-bit MSVC build. |
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crypt.c | ||
dirent.c | ||
dirmod.c | ||
erand48.c | ||
fls.c | ||
fseeko.c | ||
getaddrinfo.c | ||
getopt_long.c | ||
getopt.c | ||
getpeereid.c | ||
getrusage.c | ||
gettimeofday.c | ||
inet_aton.c | ||
inet_net_ntop.c | ||
isinf.c | ||
kill.c | ||
Makefile | ||
mkdtemp.c | ||
noblock.c | ||
open.c | ||
path.c | ||
pg_crc32c_choose.c | ||
pg_crc32c_sb8.c | ||
pg_crc32c_sse42.c | ||
pgcheckdir.c | ||
pgmkdirp.c | ||
pgsleep.c | ||
pgstrcasecmp.c | ||
pqsignal.c | ||
pthread-win32.h | ||
qsort_arg.c | ||
qsort.c | ||
quotes.c | ||
random.c | ||
README | ||
rint.c | ||
snprintf.c | ||
sprompt.c | ||
srandom.c | ||
strerror.c | ||
strlcat.c | ||
strlcpy.c | ||
system.c | ||
tar.c | ||
thread.c | ||
unsetenv.c | ||
win32.ico | ||
win32env.c | ||
win32error.c | ||
win32setlocale.c | ||
win32ver.rc |
src/port/README libpgport ========= libpgport must have special behavior. It supplies functions to both libraries and applications. However, there are two complexities: 1) Libraries need to use object files that are compiled with exactly the same flags as the library. libpgport might not use the same flags, so it is necessary to recompile the object files for individual libraries. This is done by removing -lpgport from the link line: # Need to recompile any libpgport object files LIBS := $(filter-out -lpgport, $(LIBS)) and adding infrastructure to recompile the object files: OBJS= execute.o typename.o descriptor.o data.o error.o prepare.o memory.o \ connect.o misc.o path.o exec.o \ $(filter snprintf.o, $(LIBOBJS)) The problem is that there is no testing of which object files need to be added, but missing functions usually show up when linking user applications. 2) For applications, we use -lpgport before -lpq, so the static files from libpgport are linked first. This avoids having applications dependent on symbols that are _used_ by libpq, but not intended to be exported by libpq. libpq's libpgport usage changes over time, so such a dependency is a problem. Win32, Linux, and Darwin use an export list to control the symbols exported by libpq.