mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 04:31:03 +00:00
e9b424881a
On s390 feraiseexcept (FE_OVERFLOW|FE_UNDERFLOW) sets FE_INEXACT, too. This patch uses z196 zarch load rounded instruction which can suppress FE_INEXACT exception if gcc has z196 support in used configuration. Otherwise FE_INEXACT flag is set as before. The gcc support is tested in a new configure-check. A comment in fsetexcptflg.c is corrected as new exceptions are not executed with the next floating-point instruction if fpc is set with _FPU_SETCW macro. It seems the comment was copied e.g. from sysdeps/x86_64/fpu/fsetexcptflg.c file. ChangeLog: * config.h.in (HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT): New undefine. * sysdeps/s390/configure.ac: Add test for z196 zarch support. * sysdeps/s390/configure: Regenerated. * sysdeps/s390/fpu/fraiseexcpt.c (__feraiseexcept): Use ledbra instruction for raising over-/underflow if z196 zarch is supported by default. * sysdeps/s390/fpu/fsetexcptflg.c (fesetexceptflag): Correct comment.
117 lines
3.0 KiB
Plaintext
117 lines
3.0 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
|
|
# Local configure fragment for sysdeps/s390.
|
|
|
|
dnl It is always possible to access static and hidden symbols in an
|
|
dnl position independent way.
|
|
AC_DEFINE(PI_STATIC_AND_HIDDEN)
|
|
|
|
dnl Accept as 2.24 or newer.
|
|
AC_CHECK_PROG_VER(AS, $AS, --version,
|
|
[GNU assembler.* \([0-9]*\.[0-9.]*\)],
|
|
[2.2[4-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing The program AS is required in version >= 2.24 for target S390.")
|
|
|
|
|
|
AC_CACHE_CHECK(for __builtin_tbegin, libc_cv_gcc_builtin_tbegin, [dnl
|
|
cat > conftest.c <<\EOF
|
|
#include <htmintrin.h>
|
|
void testtransaction ()
|
|
{
|
|
if (__builtin_tbegin (0) == _HTM_TBEGIN_STARTED)
|
|
{
|
|
__builtin_tend ();
|
|
}
|
|
}
|
|
EOF
|
|
dnl
|
|
dnl test, if the tbegin instruction is used by __builtin_tbegin
|
|
if AC_TRY_COMMAND([${CC-cc} -mhtm -O2 -S conftest.c -o - | grep -w tbegin > /dev/null]) ;
|
|
then
|
|
libc_cv_gcc_builtin_tbegin=yes
|
|
else
|
|
libc_cv_gcc_builtin_tbegin=no
|
|
fi
|
|
rm -f conftest* ])
|
|
|
|
if test "$enable_lock_elision" = yes && test "$libc_cv_gcc_builtin_tbegin" = no ; then
|
|
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 "$libc_cv_asm_s390_vx" = yes ;
|
|
then
|
|
AC_DEFINE(HAVE_S390_VX_ASM_SUPPORT)
|
|
else
|
|
AC_MSG_WARN([Use binutils with vector-support in order to use optimized implementations.])
|
|
fi
|
|
|
|
AC_CACHE_CHECK(for S390 vector support in gcc, libc_cv_gcc_s390_vx, [dnl
|
|
cat > conftest.c <<\EOF
|
|
void testvecclobber ()
|
|
{
|
|
__asm__ ("" : : : "v16");
|
|
}
|
|
EOF
|
|
dnl
|
|
dnl test, if gcc supports S390 vector registers as clobber in inline assembly
|
|
if AC_TRY_COMMAND([${CC-cc} --shared conftest.c -o conftest.o &> /dev/null]) ;
|
|
then
|
|
libc_cv_gcc_s390_vx=yes
|
|
else
|
|
libc_cv_gcc_s390_vx=no
|
|
fi
|
|
rm -f conftest* ])
|
|
|
|
if test "$libc_cv_gcc_s390_vx" = yes ;
|
|
then
|
|
AC_DEFINE(HAVE_S390_VX_GCC_SUPPORT)
|
|
fi
|
|
|
|
AC_CACHE_CHECK(for S390 z196 zarch instruction support as default,
|
|
libc_cv_asm_s390_min_z196_zarch, [dnl
|
|
cat > conftest.c <<\EOF
|
|
float testinsn (double e)
|
|
{
|
|
float d;
|
|
__asm__ ("ledbra %0,5,%1,4" : "=f" (d) : "f" (e) );
|
|
return d;
|
|
}
|
|
EOF
|
|
dnl
|
|
dnl test, if assembler supports S390 z196 zarch instructions as default
|
|
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS --shared conftest.c
|
|
-o conftest.o &> /dev/null]) ;
|
|
then
|
|
libc_cv_asm_s390_min_z196_zarch=yes
|
|
else
|
|
libc_cv_asm_s390_min_z196_zarch=no
|
|
fi
|
|
rm -f conftest* ])
|
|
|
|
if test "$libc_cv_asm_s390_min_z196_zarch" = yes ;
|
|
then
|
|
AC_DEFINE(HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT)
|
|
fi
|
|
|
|
test -n "$critic_missing" && AC_MSG_ERROR([
|
|
*** $critic_missing])
|