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S390: configure check for vector instruction support in assembler. 

The S390 specific test checks if the assembler has support for the new z13
vector instructions by compiling a vector instruction. The .machine and
.machinemode directives are needed to compile the vector instruction without
-march=z13 option on 31/64 bit.
On success the macro HAVE_S390_VX_ASM_SUPPORT is defined. This macro is used
to determine if the optimized functions can be build without compile errors.
If the used assembler lacks vector support, then a warning is dumped while
configuring and only the common code functions are build.

The z13 instruction support was introduced in
"[Committed] S/390: Add support for IBM z13."
(https://sourceware.org/ml/binutils/2015-01/msg00197.html)

ChangeLog:

	* config.h.in (HAVE_S390_VX_ASM_SUPPORT): New macro undefine.
	* sysdeps/s390/configure.ac: Add test for S390 vector instruction
	assembler support.
	* sysdeps/s390/configure: Regenerated.
This commit is contained in:
Stefan Liebler 2015-08-26 10:26:19 +02:00 committed by Andreas Krebbel
parent a1b0488fc9
commit 4f0a1cea34
4 changed files with 80 additions and 0 deletions
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7
ChangeLog
View File

@ -1,3 +1,10 @@
2015-08-26 Stefan Liebler <stli@linux.vnet.ibm.com>
* config.h.in (HAVE_S390_VX_ASM_SUPPORT): New macro undefine.
* sysdeps/s390/configure.ac: Add test for S390 vector instruction
assembler support.
* sysdeps/s390/configure: Regenerated.
2015-08-26 Stefan Liebler <stli@linux.vnet.ibm.com>
* sysdeps/s390/dl-procinfo.c (_dl_s390_cap_flags): Add z13.

3
config.h.in
View File

@ -91,6 +91,9 @@
/* Define if assembler supports AVX512. */
#undef HAVE_AVX512_ASM_SUPPORT
/* Define if assembler supports vector instructions on S390. */
#undef HAVE_S390_VX_ASM_SUPPORT
/* Define if assembler supports Intel MPX. */
#undef HAVE_MPX_SUPPORT

41
sysdeps/s390/configure vendored
View File

@ -104,5 +104,46 @@ if test "$enable_lock_elision" = yes && test "$libc_cv_gcc_builtin_tbegin" = no
critic_missing="$critic_missing The used GCC has no support for __builtin_tbegin, which is needed for lock-elision on target S390."
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for S390 vector instruction support" >&5
$as_echo_n "checking for S390 vector instruction support... " >&6; }
if ${libc_cv_asm_s390_vx+:} false; then :
$as_echo_n "(cached) " >&6
else
cat > conftest.c <<\EOF
void testvecinsn ()
{
__asm__ (".machine \"z13\" \n\t"
".machinemode \"zarch_nohighgprs\" \n\t"
"vistrbs %%v16,%%v17 \n\t"
"locghie %%r1,0" : :);
}
EOF
if { ac_try='${CC-cc} --shared conftest.c -o conftest.o &> /dev/null'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; } ;
then
libc_cv_asm_s390_vx=yes
else
libc_cv_asm_s390_vx=no
fi
rm -f conftest*
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_asm_s390_vx" >&5
$as_echo "$libc_cv_asm_s390_vx" >&6; }
if test "$libc_cv_asm_s390_vx" = yes ;
then
$as_echo "#define HAVE_S390_VX_ASM_SUPPORT 1" >>confdefs.h
else
{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Use binutils with vector-support in order to use optimized implementations." >&5
$as_echo "$as_me: WARNING: Use binutils with vector-support in order to use optimized implementations." >&2;}
fi
test -n "$critic_missing" && as_fn_error $? "
*** $critic_missing" "$LINENO" 5

29
sysdeps/s390/configure.ac
View File

@ -36,5 +36,34 @@ if test "$enable_lock_elision" = yes && test "$libc_cv_gcc_builtin_tbegin" = no
critic_missing="$critic_missing The used GCC has no support for __builtin_tbegin, which is needed for lock-elision on target S390."
fi
AC_CACHE_CHECK(for S390 vector instruction support, libc_cv_asm_s390_vx, [dnl
cat > conftest.c <<\EOF
void testvecinsn ()
{
__asm__ (".machine \"z13\" \n\t"
".machinemode \"zarch_nohighgprs\" \n\t"
"vistrbs %%v16,%%v17 \n\t"
"locghie %%r1,0" : :);
}
EOF
dnl
dnl test, if assembler supports S390 vector instructions
if AC_TRY_COMMAND([${CC-cc} --shared conftest.c -o conftest.o &> /dev/null]) ;
then
libc_cv_asm_s390_vx=yes
else
libc_cv_asm_s390_vx=no
fi
rm -f conftest* ])
if test "$libc_cv_asm_s390_vx" = yes ;
then
AC_DEFINE(HAVE_S390_VX_ASM_SUPPORT)
else
AC_MSG_WARN([Use binutils with vector-support in order to use optimized implementations.])
fi
test -n "$critic_missing" && AC_MSG_ERROR([
*** $critic_missing])