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Commit792752a

Browse files
Optimize pg_popcount() with AVX-512 instructions.
Presently, pg_popcount() processes data in 32-bit or 64-bit chunkswhen possible. Newer hardware that supports AVX-512 instructionscan use 512-bit chunks, which provides a nice speedup, especiallyfor larger buffers. This commit introduces the infrastructurerequired to detect compiler and CPU support for the requiredAVX-512 intrinsic functions, and it adds a new pg_popcount()implementation that uses these functions. If CPU support for thisoptimized implementation is detected at runtime, a function pointeris updated so that it is used by subsequent calls to pg_popcount().Most of the existing in-tree calls to pg_popcount() should benefitfrom these instructions, and calls with smaller buffers should atleast not regress compared to v16. The new infrastructureintroduced by this commit can also be used to optimizevisibilitymap_count(), but that is left for a follow-up commit.Co-authored-by: Paul Amonson, Ants AasmaReviewed-by: Matthias van de Meent, Tom Lane, Noah Misch, Akash Shankaran, Alvaro Herrera, Andres Freund, David RowleyDiscussion:https://postgr.es/m/BL1PR11MB5304097DF7EA81D04C33F3D1DCA6A%40BL1PR11MB5304.namprd11.prod.outlook.com
1 parent158f581 commit792752a

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15 files changed

+696
-3
lines changed

15 files changed

+696
-3
lines changed

‎config/c-compiler.m4

Lines changed: 58 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -694,3 +694,61 @@ if test x"$Ac_cachevar" = x"yes"; then
694694
fi
695695
undefine([Ac_cachevar])dnl
696696
])# PGAC_LOONGARCH_CRC32C_INTRINSICS
697+
698+
# PGAC_XSAVE_INTRINSICS
699+
# ---------------------
700+
# Check if the compiler supports the XSAVE instructions using the _xgetbv
701+
# intrinsic function.
702+
#
703+
# An optional compiler flag can be passed as argument (e.g., -mxsave). If the
704+
# intrinsic is supported, sets pgac_xsave_intrinsics and CFLAGS_XSAVE.
705+
AC_DEFUN([PGAC_XSAVE_INTRINSICS],
706+
[define([Ac_cachevar],[AS_TR_SH([pgac_cv_xsave_intrinsics_$1])])dnl
707+
AC_CACHE_CHECK([for _xgetbv with CFLAGS=$1],[Ac_cachevar],
708+
[pgac_save_CFLAGS=$CFLAGS
709+
CFLAGS="$pgac_save_CFLAGS$1"
710+
AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <immintrin.h>],
711+
[return _xgetbv(0) & 0xe0;])],
712+
[Ac_cachevar=yes],
713+
[Ac_cachevar=no])
714+
CFLAGS="$pgac_save_CFLAGS"])
715+
if test x"$Ac_cachevar" = x"yes"; then
716+
CFLAGS_XSAVE="$1"
717+
pgac_xsave_intrinsics=yes
718+
fi
719+
undefine([Ac_cachevar])dnl
720+
])# PGAC_XSAVE_INTRINSICS
721+
722+
# PGAC_AVX512_POPCNT_INTRINSICS
723+
# -----------------------------
724+
# Check if the compiler supports the AVX-512 popcount instructions using the
725+
# _mm512_setzero_si512, _mm512_maskz_loadu_epi8, _mm512_popcnt_epi64,
726+
# _mm512_add_epi64, and _mm512_reduce_add_epi64 intrinsic functions.
727+
#
728+
# Optional compiler flags can be passed as argument (e.g., -mavx512vpopcntdq
729+
# -mavx512bw). If the intrinsics are supported, sets
730+
# pgac_avx512_popcnt_intrinsics and CFLAGS_POPCNT.
731+
AC_DEFUN([PGAC_AVX512_POPCNT_INTRINSICS],
732+
[define([Ac_cachevar],[AS_TR_SH([pgac_cv_avx512_popcnt_intrinsics_$1])])dnl
733+
AC_CACHE_CHECK([for _mm512_popcnt_epi64 with CFLAGS=$1],[Ac_cachevar],
734+
[pgac_save_CFLAGS=$CFLAGS
735+
CFLAGS="$pgac_save_CFLAGS$1"
736+
AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <immintrin.h>],
737+
[const char buf@<:@sizeof(__m512i)@:>@;
738+
PG_INT64_TYPE popcnt = 0;
739+
__m512i accum = _mm512_setzero_si512();
740+
const __m512i val = _mm512_maskz_loadu_epi8((__mmask64) 0xf0f0f0f0f0f0f0f0, (const __m512i *) buf);
741+
const __m512i cnt = _mm512_popcnt_epi64(val);
742+
accum = _mm512_add_epi64(accum, cnt);
743+
popcnt = _mm512_reduce_add_epi64(accum);
744+
/* return computed value, to prevent the above being optimized away */
745+
return popcnt == 0;])],
746+
[Ac_cachevar=yes],
747+
[Ac_cachevar=no])
748+
CFLAGS="$pgac_save_CFLAGS"])
749+
if test x"$Ac_cachevar" = x"yes"; then
750+
CFLAGS_POPCNT="$1"
751+
pgac_avx512_popcnt_intrinsics=yes
752+
fi
753+
undefine([Ac_cachevar])dnl
754+
])# PGAC_AVX512_POPCNT_INTRINSICS

‎configure

Lines changed: 252 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -647,6 +647,9 @@ MSGFMT_FLAGS
647647
MSGFMT
648648
PG_CRC32C_OBJS
649649
CFLAGS_CRC
650+
PG_POPCNT_OBJS
651+
CFLAGS_POPCNT
652+
CFLAGS_XSAVE
650653
LIBOBJS
651654
OPENSSL
652655
ZSTD
@@ -17404,6 +17407,40 @@ $as_echo "#define HAVE__GET_CPUID 1" >>confdefs.h
1740417407

1740517408
fi
1740617409

17410+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __get_cpuid_count" >&5
17411+
$as_echo_n "checking for __get_cpuid_count... " >&6; }
17412+
if ${pgac_cv__get_cpuid_count+:} false; then :
17413+
$as_echo_n "(cached) " >&6
17414+
else
17415+
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
17416+
/* end confdefs.h. */
17417+
#include <cpuid.h>
17418+
int
17419+
main ()
17420+
{
17421+
unsigned int exx[4] = {0, 0, 0, 0};
17422+
__get_cpuid_count(7, 0, &exx[0], &exx[1], &exx[2], &exx[3]);
17423+
17424+
;
17425+
return 0;
17426+
}
17427+
_ACEOF
17428+
if ac_fn_c_try_link "$LINENO"; then :
17429+
pgac_cv__get_cpuid_count="yes"
17430+
else
17431+
pgac_cv__get_cpuid_count="no"
17432+
fi
17433+
rm -f core conftest.err conftest.$ac_objext \
17434+
conftest$ac_exeext conftest.$ac_ext
17435+
fi
17436+
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv__get_cpuid_count" >&5
17437+
$as_echo "$pgac_cv__get_cpuid_count" >&6; }
17438+
if test x"$pgac_cv__get_cpuid_count" = x"yes"; then
17439+
17440+
$as_echo "#define HAVE__GET_CPUID_COUNT 1" >>confdefs.h
17441+
17442+
fi
17443+
1740717444
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __cpuid" >&5
1740817445
$as_echo_n "checking for __cpuid... " >&6; }
1740917446
if ${pgac_cv__cpuid+:} false; then :
@@ -17438,6 +17475,221 @@ $as_echo "#define HAVE__CPUID 1" >>confdefs.h
1743817475

1743917476
fi
1744017477

17478+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __cpuidex" >&5
17479+
$as_echo_n "checking for __cpuidex... " >&6; }
17480+
if ${pgac_cv__cpuidex+:} false; then :
17481+
$as_echo_n "(cached) " >&6
17482+
else
17483+
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
17484+
/* end confdefs.h. */
17485+
#include <intrin.h>
17486+
int
17487+
main ()
17488+
{
17489+
unsigned int exx[4] = {0, 0, 0, 0};
17490+
__get_cpuidex(exx[0], 7, 0);
17491+
17492+
;
17493+
return 0;
17494+
}
17495+
_ACEOF
17496+
if ac_fn_c_try_link "$LINENO"; then :
17497+
pgac_cv__cpuidex="yes"
17498+
else
17499+
pgac_cv__cpuidex="no"
17500+
fi
17501+
rm -f core conftest.err conftest.$ac_objext \
17502+
conftest$ac_exeext conftest.$ac_ext
17503+
fi
17504+
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv__cpuidex" >&5
17505+
$as_echo "$pgac_cv__cpuidex" >&6; }
17506+
if test x"$pgac_cv__cpuidex" = x"yes"; then
17507+
17508+
$as_echo "#define HAVE__CPUIDEX 1" >>confdefs.h
17509+
17510+
fi
17511+
17512+
# Check for XSAVE intrinsics
17513+
#
17514+
CFLAGS_XSAVE=""
17515+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for _xgetbv with CFLAGS=" >&5
17516+
$as_echo_n "checking for _xgetbv with CFLAGS=... " >&6; }
17517+
if ${pgac_cv_xsave_intrinsics_+:} false; then :
17518+
$as_echo_n "(cached) " >&6
17519+
else
17520+
pgac_save_CFLAGS=$CFLAGS
17521+
CFLAGS="$pgac_save_CFLAGS "
17522+
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
17523+
/* end confdefs.h. */
17524+
#include <immintrin.h>
17525+
int
17526+
main ()
17527+
{
17528+
return _xgetbv(0) & 0xe0;
17529+
;
17530+
return 0;
17531+
}
17532+
_ACEOF
17533+
if ac_fn_c_try_link "$LINENO"; then :
17534+
pgac_cv_xsave_intrinsics_=yes
17535+
else
17536+
pgac_cv_xsave_intrinsics_=no
17537+
fi
17538+
rm -f core conftest.err conftest.$ac_objext \
17539+
conftest$ac_exeext conftest.$ac_ext
17540+
CFLAGS="$pgac_save_CFLAGS"
17541+
fi
17542+
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_xsave_intrinsics_" >&5
17543+
$as_echo "$pgac_cv_xsave_intrinsics_" >&6; }
17544+
if test x"$pgac_cv_xsave_intrinsics_" = x"yes"; then
17545+
CFLAGS_XSAVE=""
17546+
pgac_xsave_intrinsics=yes
17547+
fi
17548+
17549+
if test x"$pgac_xsave_intrinsics" != x"yes"; then
17550+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for _xgetbv with CFLAGS=-mxsave" >&5
17551+
$as_echo_n "checking for _xgetbv with CFLAGS=-mxsave... " >&6; }
17552+
if ${pgac_cv_xsave_intrinsics__mxsave+:} false; then :
17553+
$as_echo_n "(cached) " >&6
17554+
else
17555+
pgac_save_CFLAGS=$CFLAGS
17556+
CFLAGS="$pgac_save_CFLAGS -mxsave"
17557+
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
17558+
/* end confdefs.h. */
17559+
#include <immintrin.h>
17560+
int
17561+
main ()
17562+
{
17563+
return _xgetbv(0) & 0xe0;
17564+
;
17565+
return 0;
17566+
}
17567+
_ACEOF
17568+
if ac_fn_c_try_link "$LINENO"; then :
17569+
pgac_cv_xsave_intrinsics__mxsave=yes
17570+
else
17571+
pgac_cv_xsave_intrinsics__mxsave=no
17572+
fi
17573+
rm -f core conftest.err conftest.$ac_objext \
17574+
conftest$ac_exeext conftest.$ac_ext
17575+
CFLAGS="$pgac_save_CFLAGS"
17576+
fi
17577+
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_xsave_intrinsics__mxsave" >&5
17578+
$as_echo "$pgac_cv_xsave_intrinsics__mxsave" >&6; }
17579+
if test x"$pgac_cv_xsave_intrinsics__mxsave" = x"yes"; then
17580+
CFLAGS_XSAVE="-mxsave"
17581+
pgac_xsave_intrinsics=yes
17582+
fi
17583+
17584+
fi
17585+
if test x"$pgac_xsave_intrinsics" = x"yes"; then
17586+
17587+
$as_echo "#define HAVE_XSAVE_INTRINSICS 1" >>confdefs.h
17588+
17589+
fi
17590+
17591+
17592+
# Check for AVX-512 popcount intrinsics
17593+
#
17594+
CFLAGS_POPCNT=""
17595+
PG_POPCNT_OBJS=""
17596+
if test x"$host_cpu" = x"x86_64"; then
17597+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for _mm512_popcnt_epi64 with CFLAGS=" >&5
17598+
$as_echo_n "checking for _mm512_popcnt_epi64 with CFLAGS=... " >&6; }
17599+
if ${pgac_cv_avx512_popcnt_intrinsics_+:} false; then :
17600+
$as_echo_n "(cached) " >&6
17601+
else
17602+
pgac_save_CFLAGS=$CFLAGS
17603+
CFLAGS="$pgac_save_CFLAGS "
17604+
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
17605+
/* end confdefs.h. */
17606+
#include <immintrin.h>
17607+
int
17608+
main ()
17609+
{
17610+
const char buf[sizeof(__m512i)];
17611+
PG_INT64_TYPE popcnt = 0;
17612+
__m512i accum = _mm512_setzero_si512();
17613+
const __m512i val = _mm512_maskz_loadu_epi8((__mmask64) 0xf0f0f0f0f0f0f0f0, (const __m512i *) buf);
17614+
const __m512i cnt = _mm512_popcnt_epi64(val);
17615+
accum = _mm512_add_epi64(accum, cnt);
17616+
popcnt = _mm512_reduce_add_epi64(accum);
17617+
/* return computed value, to prevent the above being optimized away */
17618+
return popcnt == 0;
17619+
;
17620+
return 0;
17621+
}
17622+
_ACEOF
17623+
if ac_fn_c_try_link "$LINENO"; then :
17624+
pgac_cv_avx512_popcnt_intrinsics_=yes
17625+
else
17626+
pgac_cv_avx512_popcnt_intrinsics_=no
17627+
fi
17628+
rm -f core conftest.err conftest.$ac_objext \
17629+
conftest$ac_exeext conftest.$ac_ext
17630+
CFLAGS="$pgac_save_CFLAGS"
17631+
fi
17632+
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_avx512_popcnt_intrinsics_" >&5
17633+
$as_echo "$pgac_cv_avx512_popcnt_intrinsics_" >&6; }
17634+
if test x"$pgac_cv_avx512_popcnt_intrinsics_" = x"yes"; then
17635+
CFLAGS_POPCNT=""
17636+
pgac_avx512_popcnt_intrinsics=yes
17637+
fi
17638+
17639+
if test x"$pgac_avx512_popcnt_intrinsics" != x"yes"; then
17640+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for _mm512_popcnt_epi64 with CFLAGS=-mavx512vpopcntdq -mavx512bw" >&5
17641+
$as_echo_n "checking for _mm512_popcnt_epi64 with CFLAGS=-mavx512vpopcntdq -mavx512bw... " >&6; }
17642+
if ${pgac_cv_avx512_popcnt_intrinsics__mavx512vpopcntdq__mavx512bw+:} false; then :
17643+
$as_echo_n "(cached) " >&6
17644+
else
17645+
pgac_save_CFLAGS=$CFLAGS
17646+
CFLAGS="$pgac_save_CFLAGS -mavx512vpopcntdq -mavx512bw"
17647+
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
17648+
/* end confdefs.h. */
17649+
#include <immintrin.h>
17650+
int
17651+
main ()
17652+
{
17653+
const char buf[sizeof(__m512i)];
17654+
PG_INT64_TYPE popcnt = 0;
17655+
__m512i accum = _mm512_setzero_si512();
17656+
const __m512i val = _mm512_maskz_loadu_epi8((__mmask64) 0xf0f0f0f0f0f0f0f0, (const __m512i *) buf);
17657+
const __m512i cnt = _mm512_popcnt_epi64(val);
17658+
accum = _mm512_add_epi64(accum, cnt);
17659+
popcnt = _mm512_reduce_add_epi64(accum);
17660+
/* return computed value, to prevent the above being optimized away */
17661+
return popcnt == 0;
17662+
;
17663+
return 0;
17664+
}
17665+
_ACEOF
17666+
if ac_fn_c_try_link "$LINENO"; then :
17667+
pgac_cv_avx512_popcnt_intrinsics__mavx512vpopcntdq__mavx512bw=yes
17668+
else
17669+
pgac_cv_avx512_popcnt_intrinsics__mavx512vpopcntdq__mavx512bw=no
17670+
fi
17671+
rm -f core conftest.err conftest.$ac_objext \
17672+
conftest$ac_exeext conftest.$ac_ext
17673+
CFLAGS="$pgac_save_CFLAGS"
17674+
fi
17675+
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_avx512_popcnt_intrinsics__mavx512vpopcntdq__mavx512bw" >&5
17676+
$as_echo "$pgac_cv_avx512_popcnt_intrinsics__mavx512vpopcntdq__mavx512bw" >&6; }
17677+
if test x"$pgac_cv_avx512_popcnt_intrinsics__mavx512vpopcntdq__mavx512bw" = x"yes"; then
17678+
CFLAGS_POPCNT="-mavx512vpopcntdq -mavx512bw"
17679+
pgac_avx512_popcnt_intrinsics=yes
17680+
fi
17681+
17682+
fi
17683+
if test x"$pgac_avx512_popcnt_intrinsics" = x"yes"; then
17684+
PG_POPCNT_OBJS="pg_popcount_avx512.o pg_popcount_avx512_choose.o"
17685+
17686+
$as_echo "#define USE_AVX512_POPCNT_WITH_RUNTIME_CHECK 1" >>confdefs.h
17687+
17688+
fi
17689+
fi
17690+
17691+
17692+
1744117693
# Check for Intel SSE 4.2 intrinsics to do CRC calculations.
1744217694
#
1744317695
# First check if the _mm_crc32_u8 and _mm_crc32_u64 intrinsics can be used

‎configure.ac

Lines changed: 51 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2052,6 +2052,17 @@ if test x"$pgac_cv__get_cpuid" = x"yes"; then
20522052
AC_DEFINE(HAVE__GET_CPUID,1,[Define to 1 if you have __get_cpuid.])
20532053
fi
20542054

2055+
AC_CACHE_CHECK([for __get_cpuid_count],[pgac_cv__get_cpuid_count],
2056+
[AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <cpuid.h>],
2057+
[[unsigned int exx[4] = {0, 0, 0, 0};
2058+
__get_cpuid_count(7, 0, &exx[0], &exx[1], &exx[2], &exx[3]);
2059+
]])],
2060+
[pgac_cv__get_cpuid_count="yes"],
2061+
[pgac_cv__get_cpuid_count="no"])])
2062+
if test x"$pgac_cv__get_cpuid_count" = x"yes"; then
2063+
AC_DEFINE(HAVE__GET_CPUID_COUNT,1,[Define to 1 if you have __get_cpuid_count.])
2064+
fi
2065+
20552066
AC_CACHE_CHECK([for __cpuid],[pgac_cv__cpuid],
20562067
[AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <intrin.h>],
20572068
[[unsigned int exx[4] = {0, 0, 0, 0};
@@ -2063,6 +2074,46 @@ if test x"$pgac_cv__cpuid" = x"yes"; then
20632074
AC_DEFINE(HAVE__CPUID,1,[Define to 1 if you have __cpuid.])
20642075
fi
20652076

2077+
AC_CACHE_CHECK([for __cpuidex],[pgac_cv__cpuidex],
2078+
[AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <intrin.h>],
2079+
[[unsigned int exx[4] = {0, 0, 0, 0};
2080+
__get_cpuidex(exx[0], 7, 0);
2081+
]])],
2082+
[pgac_cv__cpuidex="yes"],
2083+
[pgac_cv__cpuidex="no"])])
2084+
if test x"$pgac_cv__cpuidex" = x"yes"; then
2085+
AC_DEFINE(HAVE__CPUIDEX,1,[Define to 1 if you have __cpuidex.])
2086+
fi
2087+
2088+
# Check for XSAVE intrinsics
2089+
#
2090+
CFLAGS_XSAVE=""
2091+
PGAC_XSAVE_INTRINSICS([])
2092+
if test x"$pgac_xsave_intrinsics" != x"yes"; then
2093+
PGAC_XSAVE_INTRINSICS([-mxsave])
2094+
fi
2095+
if test x"$pgac_xsave_intrinsics" = x"yes"; then
2096+
AC_DEFINE(HAVE_XSAVE_INTRINSICS,1,[Define to 1 if you have XSAVE intrinsics.])
2097+
fi
2098+
AC_SUBST(CFLAGS_XSAVE)
2099+
2100+
# Check for AVX-512 popcount intrinsics
2101+
#
2102+
CFLAGS_POPCNT=""
2103+
PG_POPCNT_OBJS=""
2104+
if test x"$host_cpu" = x"x86_64"; then
2105+
PGAC_AVX512_POPCNT_INTRINSICS([])
2106+
if test x"$pgac_avx512_popcnt_intrinsics" != x"yes"; then
2107+
PGAC_AVX512_POPCNT_INTRINSICS([-mavx512vpopcntdq -mavx512bw])
2108+
fi
2109+
if test x"$pgac_avx512_popcnt_intrinsics" = x"yes"; then
2110+
PG_POPCNT_OBJS="pg_popcount_avx512.o pg_popcount_avx512_choose.o"
2111+
AC_DEFINE(USE_AVX512_POPCNT_WITH_RUNTIME_CHECK,1,[Define to 1 to use AVX-512 popcount instructions with a runtime check.])
2112+
fi
2113+
fi
2114+
AC_SUBST(CFLAGS_POPCNT)
2115+
AC_SUBST(PG_POPCNT_OBJS)
2116+
20662117
# Check for Intel SSE 4.2 intrinsics to do CRC calculations.
20672118
#
20682119
# First check if the _mm_crc32_u8 and _mm_crc32_u64 intrinsics can be used

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