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Compiler optimizations for page checksum code.

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Ants Aasma and Jeff Davis
This commit is contained in:
Simon Riggs
2013-04-30 06:59:26 +01:00
parent 3d53173e20
commit fdea2530bd
5 changed files with 169 additions and 0 deletions
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130
configure vendored
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@ -731,6 +731,7 @@ autodepend
TAS
GCC
CPP
CFLAGS_VECTOR
SUN_STUDIO_CC
OBJEXT
EXEEXT
@ -3944,6 +3945,11 @@ else
fi
fi
# set CFLAGS_VECTOR from the environment, if available
if test "$ac_env_CFLAGS_VECTOR_set" = set; then
CFLAGS_VECTOR=$ac_env_CFLAGS_VECTOR_value
fi
# Some versions of GCC support some additional useful warning flags.
# Check whether they are supported, and add them to CFLAGS if so.
# ICC pretends to be GCC but it's lying; it doesn't support these flags,
@ -4376,6 +4382,127 @@ if test x"$pgac_cv_prog_cc_cflags__fexcess_precision_standard" = x"yes"; then
CFLAGS="$CFLAGS -fexcess-precision=standard"
fi
# Optimization flags for specific files that benefit from vectorization
{ $as_echo "$as_me:$LINENO: checking whether $CC supports -funroll-loops" >&5
$as_echo_n "checking whether $CC supports -funroll-loops... " >&6; }
if test "${pgac_cv_prog_cc_cflags__funroll_loops+set}" = set; then
$as_echo_n "(cached) " >&6
else
pgac_save_CFLAGS=$CFLAGS
CFLAGS="$pgac_save_CFLAGS -funroll-loops"
ac_save_c_werror_flag=$ac_c_werror_flag
ac_c_werror_flag=yes
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
int
main ()
{
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext
if { (ac_try="$ac_compile"
case "(($ac_try" in
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
*) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
(eval "$ac_compile") 2>conftest.er1
ac_status=$?
grep -v '^ *+' conftest.er1 >conftest.err
rm -f conftest.er1
cat conftest.err >&5
$as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); } && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest.$ac_objext; then
pgac_cv_prog_cc_cflags__funroll_loops=yes
else
$as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
pgac_cv_prog_cc_cflags__funroll_loops=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
ac_c_werror_flag=$ac_save_c_werror_flag
CFLAGS="$pgac_save_CFLAGS"
fi
{ $as_echo "$as_me:$LINENO: result: $pgac_cv_prog_cc_cflags__funroll_loops" >&5
$as_echo "$pgac_cv_prog_cc_cflags__funroll_loops" >&6; }
if test x"$pgac_cv_prog_cc_cflags__funroll_loops" = x"yes"; then
CFLAGS_VECTOR="${CFLAGS_VECTOR} -funroll-loops"
fi
{ $as_echo "$as_me:$LINENO: checking whether $CC supports -ftree-vectorize" >&5
$as_echo_n "checking whether $CC supports -ftree-vectorize... " >&6; }
if test "${pgac_cv_prog_cc_cflags__ftree_vectorize+set}" = set; then
$as_echo_n "(cached) " >&6
else
pgac_save_CFLAGS=$CFLAGS
CFLAGS="$pgac_save_CFLAGS -ftree-vectorize"
ac_save_c_werror_flag=$ac_c_werror_flag
ac_c_werror_flag=yes
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
int
main ()
{
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext
if { (ac_try="$ac_compile"
case "(($ac_try" in
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
*) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
(eval "$ac_compile") 2>conftest.er1
ac_status=$?
grep -v '^ *+' conftest.er1 >conftest.err
rm -f conftest.er1
cat conftest.err >&5
$as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); } && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest.$ac_objext; then
pgac_cv_prog_cc_cflags__ftree_vectorize=yes
else
$as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
pgac_cv_prog_cc_cflags__ftree_vectorize=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
ac_c_werror_flag=$ac_save_c_werror_flag
CFLAGS="$pgac_save_CFLAGS"
fi
{ $as_echo "$as_me:$LINENO: result: $pgac_cv_prog_cc_cflags__ftree_vectorize" >&5
$as_echo "$pgac_cv_prog_cc_cflags__ftree_vectorize" >&6; }
if test x"$pgac_cv_prog_cc_cflags__ftree_vectorize" = x"yes"; then
CFLAGS_VECTOR="${CFLAGS_VECTOR} -ftree-vectorize"
fi
elif test "$ICC" = yes; then
# Intel's compiler has a bug/misoptimization in checking for
# division by NAN (NaN == 0), -mp1 fixes it, so add it to the CFLAGS.
@ -4627,6 +4754,9 @@ fi
fi
CFLAGS_VECTOR=$CFLAGS_VECTOR
# supply -g if --enable-debug
if test "$enable_debug" = yes && test "$ac_cv_prog_cc_g" = yes; then
CFLAGS="$CFLAGS -g"