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Commitfdea253

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Compiler optimizations for page checksum code.
Ants Aasma and Jeff Davis
1 parent3d53173 commitfdea253

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5 files changed

+169
-0
lines changed

5 files changed

+169
-0
lines changed

‎config/c-compiler.m4

Lines changed: 25 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -242,6 +242,31 @@ undefine([Ac_cachevar])dnl
242242

243243

244244

245+
# PGAC_PROG_CC_VAR_OPT
246+
# -----------------------
247+
# Given a variable name and a string, check if the compiler supports
248+
# the string as a command-line option. If it does, add the string to
249+
# the given variable.
250+
AC_DEFUN([PGAC_PROG_CC_VAR_OPT],
251+
[define([Ac_cachevar],[AS_TR_SH([pgac_cv_prog_cc_cflags_$2])])dnl
252+
AC_CACHE_CHECK([whether $CC supports$2],[Ac_cachevar],
253+
[pgac_save_CFLAGS=$CFLAGS
254+
CFLAGS="$pgac_save_CFLAGS$2"
255+
ac_save_c_werror_flag=$ac_c_werror_flag
256+
ac_c_werror_flag=yes
257+
_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
258+
[Ac_cachevar=yes],
259+
[Ac_cachevar=no])
260+
ac_c_werror_flag=$ac_save_c_werror_flag
261+
CFLAGS="$pgac_save_CFLAGS"])
262+
if test x"$Ac_cachevar" = x"yes"; then
263+
$1="${$1}$2"
264+
fi
265+
undefine([Ac_cachevar])dnl
266+
])# PGAC_PROG_CC_CFLAGS_OPT
267+
268+
269+
245270
# PGAC_PROG_CC_LDFLAGS_OPT
246271
# ------------------------
247272
# Given a string, check if the compiler supports the string as a

‎configure

Lines changed: 130 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -731,6 +731,7 @@ autodepend
731731
TAS
732732
GCC
733733
CPP
734+
CFLAGS_VECTOR
734735
SUN_STUDIO_CC
735736
OBJEXT
736737
EXEEXT
@@ -3944,6 +3945,11 @@ else
39443945
fi
39453946
fi
39463947

3948+
# set CFLAGS_VECTOR from the environment, if available
3949+
if test "$ac_env_CFLAGS_VECTOR_set" = set; then
3950+
CFLAGS_VECTOR=$ac_env_CFLAGS_VECTOR_value
3951+
fi
3952+
39473953
# Some versions of GCC support some additional useful warning flags.
39483954
# Check whether they are supported, and add them to CFLAGS if so.
39493955
# ICC pretends to be GCC but it's lying; it doesn't support these flags,
@@ -4376,6 +4382,127 @@ if test x"$pgac_cv_prog_cc_cflags__fexcess_precision_standard" = x"yes"; then
43764382
CFLAGS="$CFLAGS -fexcess-precision=standard"
43774383
fi
43784384

4385+
# Optimization flags for specific files that benefit from vectorization
4386+
{ $as_echo "$as_me:$LINENO: checking whether $CC supports -funroll-loops" >&5
4387+
$as_echo_n "checking whether $CC supports -funroll-loops... " >&6; }
4388+
if test "${pgac_cv_prog_cc_cflags__funroll_loops+set}" = set; then
4389+
$as_echo_n "(cached) " >&6
4390+
else
4391+
pgac_save_CFLAGS=$CFLAGS
4392+
CFLAGS="$pgac_save_CFLAGS -funroll-loops"
4393+
ac_save_c_werror_flag=$ac_c_werror_flag
4394+
ac_c_werror_flag=yes
4395+
cat >conftest.$ac_ext <<_ACEOF
4396+
/* confdefs.h. */
4397+
_ACEOF
4398+
cat confdefs.h >>conftest.$ac_ext
4399+
cat >>conftest.$ac_ext <<_ACEOF
4400+
/* end confdefs.h. */
4401+
4402+
int
4403+
main ()
4404+
{
4405+
4406+
;
4407+
return 0;
4408+
}
4409+
_ACEOF
4410+
rm -f conftest.$ac_objext
4411+
if { (ac_try="$ac_compile"
4412+
case "(($ac_try" in
4413+
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
4414+
*) ac_try_echo=$ac_try;;
4415+
esac
4416+
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
4417+
$as_echo "$ac_try_echo") >&5
4418+
(eval "$ac_compile") 2>conftest.er1
4419+
ac_status=$?
4420+
grep -v '^ *+' conftest.er1 >conftest.err
4421+
rm -f conftest.er1
4422+
cat conftest.err >&5
4423+
$as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
4424+
(exit $ac_status); } && {
4425+
test -z "$ac_c_werror_flag" ||
4426+
test ! -s conftest.err
4427+
} && test -s conftest.$ac_objext; then
4428+
pgac_cv_prog_cc_cflags__funroll_loops=yes
4429+
else
4430+
$as_echo "$as_me: failed program was:" >&5
4431+
sed 's/^/| /' conftest.$ac_ext >&5
4432+
4433+
pgac_cv_prog_cc_cflags__funroll_loops=no
4434+
fi
4435+
4436+
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
4437+
ac_c_werror_flag=$ac_save_c_werror_flag
4438+
CFLAGS="$pgac_save_CFLAGS"
4439+
fi
4440+
{ $as_echo "$as_me:$LINENO: result: $pgac_cv_prog_cc_cflags__funroll_loops" >&5
4441+
$as_echo "$pgac_cv_prog_cc_cflags__funroll_loops" >&6; }
4442+
if test x"$pgac_cv_prog_cc_cflags__funroll_loops" = x"yes"; then
4443+
CFLAGS_VECTOR="${CFLAGS_VECTOR} -funroll-loops"
4444+
fi
4445+
4446+
{ $as_echo "$as_me:$LINENO: checking whether $CC supports -ftree-vectorize" >&5
4447+
$as_echo_n "checking whether $CC supports -ftree-vectorize... " >&6; }
4448+
if test "${pgac_cv_prog_cc_cflags__ftree_vectorize+set}" = set; then
4449+
$as_echo_n "(cached) " >&6
4450+
else
4451+
pgac_save_CFLAGS=$CFLAGS
4452+
CFLAGS="$pgac_save_CFLAGS -ftree-vectorize"
4453+
ac_save_c_werror_flag=$ac_c_werror_flag
4454+
ac_c_werror_flag=yes
4455+
cat >conftest.$ac_ext <<_ACEOF
4456+
/* confdefs.h. */
4457+
_ACEOF
4458+
cat confdefs.h >>conftest.$ac_ext
4459+
cat >>conftest.$ac_ext <<_ACEOF
4460+
/* end confdefs.h. */
4461+
4462+
int
4463+
main ()
4464+
{
4465+
4466+
;
4467+
return 0;
4468+
}
4469+
_ACEOF
4470+
rm -f conftest.$ac_objext
4471+
if { (ac_try="$ac_compile"
4472+
case "(($ac_try" in
4473+
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
4474+
*) ac_try_echo=$ac_try;;
4475+
esac
4476+
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
4477+
$as_echo "$ac_try_echo") >&5
4478+
(eval "$ac_compile") 2>conftest.er1
4479+
ac_status=$?
4480+
grep -v '^ *+' conftest.er1 >conftest.err
4481+
rm -f conftest.er1
4482+
cat conftest.err >&5
4483+
$as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
4484+
(exit $ac_status); } && {
4485+
test -z "$ac_c_werror_flag" ||
4486+
test ! -s conftest.err
4487+
} && test -s conftest.$ac_objext; then
4488+
pgac_cv_prog_cc_cflags__ftree_vectorize=yes
4489+
else
4490+
$as_echo "$as_me: failed program was:" >&5
4491+
sed 's/^/| /' conftest.$ac_ext >&5
4492+
4493+
pgac_cv_prog_cc_cflags__ftree_vectorize=no
4494+
fi
4495+
4496+
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
4497+
ac_c_werror_flag=$ac_save_c_werror_flag
4498+
CFLAGS="$pgac_save_CFLAGS"
4499+
fi
4500+
{ $as_echo "$as_me:$LINENO: result: $pgac_cv_prog_cc_cflags__ftree_vectorize" >&5
4501+
$as_echo "$pgac_cv_prog_cc_cflags__ftree_vectorize" >&6; }
4502+
if test x"$pgac_cv_prog_cc_cflags__ftree_vectorize" = x"yes"; then
4503+
CFLAGS_VECTOR="${CFLAGS_VECTOR} -ftree-vectorize"
4504+
fi
4505+
43794506
elif test "$ICC" = yes; then
43804507
# Intel's compiler has a bug/misoptimization in checking for
43814508
# division by NAN (NaN == 0), -mp1 fixes it, so add it to the CFLAGS.
@@ -4627,6 +4754,9 @@ fi
46274754

46284755
fi
46294756

4757+
CFLAGS_VECTOR=$CFLAGS_VECTOR
4758+
4759+
46304760
# supply -g if --enable-debug
46314761
if test "$enable_debug" = yes && test "$ac_cv_prog_cc_g" = yes; then
46324762
CFLAGS="$CFLAGS -g"

‎configure.in

Lines changed: 10 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -400,6 +400,11 @@ else
400400
fi
401401
fi
402402

403+
# set CFLAGS_VECTOR from the environment, if available
404+
if test "$ac_env_CFLAGS_VECTOR_set" = set; then
405+
CFLAGS_VECTOR=$ac_env_CFLAGS_VECTOR_value
406+
fi
407+
403408
# Some versions of GCC support some additional useful warning flags.
404409
# Check whether they are supported, and add them to CFLAGS if so.
405410
# ICC pretends to be GCC but it's lying; it doesn't support these flags,
@@ -419,6 +424,9 @@ if test "$GCC" = yes -a "$ICC" = no; then
419424
PGAC_PROG_CC_CFLAGS_OPT([-fwrapv])
420425
# Disable FP optimizations that cause various errors on gcc 4.5+ or maybe 4.6+
421426
PGAC_PROG_CC_CFLAGS_OPT([-fexcess-precision=standard])
427+
# Optimization flags for specific files that benefit from vectorization
428+
PGAC_PROG_CC_VAR_OPT(CFLAGS_VECTOR, [-funroll-loops])
429+
PGAC_PROG_CC_VAR_OPT(CFLAGS_VECTOR, [-ftree-vectorize])
422430
elif test "$ICC" = yes; then
423431
# Intel's compiler has a bug/misoptimization in checking for
424432
# division by NAN (NaN == 0), -mp1 fixes it, so add it to the CFLAGS.
@@ -434,6 +442,8 @@ elif test "$PORTNAME" = "hpux"; then
434442
PGAC_PROG_CC_CFLAGS_OPT([+Olibmerrno])
435443
fi
436444

445+
AC_SUBST(CFLAGS_VECTOR, $CFLAGS_VECTOR)
446+
437447
# supply -g if --enable-debug
438448
if test "$enable_debug" = yes && test "$ac_cv_prog_cc_g" = yes; then
439449
CFLAGS="$CFLAGS -g"

‎src/Makefile.global.in

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -219,6 +219,7 @@ CC = @CC@
219219
GCC = @GCC@
220220
SUN_STUDIO_CC = @SUN_STUDIO_CC@
221221
CFLAGS = @CFLAGS@
222+
CFLAGS_VECTOR = @CFLAGS_VECTOR@
222223

223224
# Kind-of compilers
224225

‎src/backend/storage/page/Makefile

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -15,3 +15,6 @@ include $(top_builddir)/src/Makefile.global
1515
OBJS = bufpage.o checksum.o itemptr.o
1616

1717
include$(top_srcdir)/src/backend/common.mk
18+
19+
# important optimizations flags for checksum.c
20+
checksum.o: CFLAGS += ${CFLAGS_VECTOR}

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