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authorStefan Liebler <stli@linux.vnet.ibm.com>2015-08-26 10:26:19 +0200
committerAndreas Krebbel <krebbel@linux.vnet.ibm.com>2015-08-26 10:26:19 +0200
commit4f0a1cea34c05fb2acc16f1a2d291f53230eb4fb (patch)
tree474a3cf443a605bae96d09127300e4f7204d78bc /sysdeps/s390/configure.ac
parenta1b0488fc9df3d895a2e5eefbcd348d3f7fe0e52 (diff)
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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.
Diffstat (limited to 'sysdeps/s390/configure.ac')
-rw-r--r--sysdeps/s390/configure.ac29
1 files changed, 29 insertions, 0 deletions
diff --git a/sysdeps/s390/configure.ac b/sysdeps/s390/configure.ac
index 493e9a469c..4da134e9a0 100644
--- a/sysdeps/s390/configure.ac
+++ b/sysdeps/s390/configure.ac
@@ -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])