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From 63be4dc8f5be08f40df927377bdf0bae5239ce53 Mon Sep 17 00:00:00 2001
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From: Stefan Liebler <stli@linux.vnet.ibm.com>
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Date: Thu, 27 Jul 2017 10:53:58 +0200
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Subject: [PATCH 01/10] S390: Configure checks
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HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT.
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This configure check was added upstream with commit
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e9b424881a4f85284e56d8b561c54ff57a7c1c9b
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"S390: Do not set FE_INEXACT with feraiseexcept (FE_OWERFLOW|FE_UNDERFLOW)."
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HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT will be defined if gcc/assembler
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can handle zarch z196 instructions by default.
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Thus it is defined on s390x-glibc on RHEL 7, but not for s390-glibc.
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ChangeLog:
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* config.h.in (HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT):
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New undefine.
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* sysdeps/s390/configure.ac: Add test for z196 zarch support.
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* sysdeps/s390/configure: Regenerated.
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---
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config.h.in | 3 +++
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sysdeps/s390/configure | 36 ++++++++++++++++++++++++++++++++++++
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sysdeps/s390/configure.in | 26 ++++++++++++++++++++++++++
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3 files changed, 65 insertions(+)
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diff --git a/config.h.in b/config.h.in
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index 66ac85a..07bc713 100644
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--- a/config.h.in
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+++ b/config.h.in
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@@ -110,6 +110,9 @@
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/* Define if assembler supports Intel MPX. */
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#undef HAVE_MPX_SUPPORT
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+/* Define if assembler supports z196 zarch instructions as default on S390. */
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+#undef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
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+
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/* Define if assembler supports vector instructions on S390. */
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#undef HAVE_S390_VX_ASM_SUPPORT
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diff --git a/sysdeps/s390/configure b/sysdeps/s390/configure
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index eb49a4c..bb670f3 100644
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--- a/sysdeps/s390/configure
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+++ b/sysdeps/s390/configure
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@@ -75,3 +75,39 @@ then
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$as_echo "#define HAVE_S390_VX_GCC_SUPPORT 1" >>confdefs.h
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fi
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+
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+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for S390 z196 zarch instruction support as default" >&5
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+$as_echo_n "checking for S390 z196 zarch instruction support as default... " >&6; }
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+if ${libc_cv_asm_s390_min_z196_zarch+:} false; then :
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+ $as_echo_n "(cached) " >&6
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+else
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+ cat > conftest.c <<\EOF
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+float testinsn (double e)
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+{
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+ float d;
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+ __asm__ ("ledbra %0,5,%1,4" : "=f" (d) : "f" (e) );
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+ return d;
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+}
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+EOF
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+if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS --shared conftest.c
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+ -o conftest.o &> /dev/null'
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+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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+ (eval $ac_try) 2>&5
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+ ac_status=$?
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+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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+ test $ac_status = 0; }; } ;
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+then
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+ libc_cv_asm_s390_min_z196_zarch=yes
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+else
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+ libc_cv_asm_s390_min_z196_zarch=no
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+fi
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+rm -f conftest*
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+fi
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+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_asm_s390_min_z196_zarch" >&5
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+$as_echo "$libc_cv_asm_s390_min_z196_zarch" >&6; }
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+
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+if test "$libc_cv_asm_s390_min_z196_zarch" = yes ;
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+then
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+ $as_echo "#define HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT 1" >>confdefs.h
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+
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+fi
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diff --git a/sysdeps/s390/configure.in b/sysdeps/s390/configure.in
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index a3b1f25..bad92bd 100644
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--- a/sysdeps/s390/configure.in
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+++ b/sysdeps/s390/configure.in
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@@ -53,3 +53,29 @@ if test "$libc_cv_gcc_s390_vx" = yes ;
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then
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AC_DEFINE(HAVE_S390_VX_GCC_SUPPORT)
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fi
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+
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+AC_CACHE_CHECK(for S390 z196 zarch instruction support as default,
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+ libc_cv_asm_s390_min_z196_zarch, [dnl
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+cat > conftest.c <<\EOF
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+float testinsn (double e)
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+{
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+ float d;
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+ __asm__ ("ledbra %0,5,%1,4" : "=f" (d) : "f" (e) );
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+ return d;
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+}
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+EOF
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+dnl
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+dnl test, if assembler supports S390 z196 zarch instructions as default
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+if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS --shared conftest.c
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+ -o conftest.o &> /dev/null]) ;
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+then
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+ libc_cv_asm_s390_min_z196_zarch=yes
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+else
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+ libc_cv_asm_s390_min_z196_zarch=no
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+fi
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+rm -f conftest* ])
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+
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+if test "$libc_cv_asm_s390_min_z196_zarch" = yes ;
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+then
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+ AC_DEFINE(HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT)
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+fi
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--
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1.8.3.1
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