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132 lines
4.4 KiB
132 lines
4.4 KiB
From 2d04109858181ed8c7dc3e4ae42923a26c1d3591 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, 8 Oct 2015 10:47:37 +0200 |
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Subject: [PATCH 08/30] S390: configure check for vector instruction support in |
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assembler. |
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upstream-commit-id: 4f0a1cea34c05fb2acc16f1a2d291f53230eb4fb |
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https://www.sourceware.org/ml/libc-alpha/2015-07/msg00153.html |
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The S390 specific test checks if the assembler has support for the new z13 |
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vector instructions by compiling a vector instruction. The .machine and |
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.machinemode directives are needed to compile the vector instruction without |
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-march=z13 option on 31/64 bit. |
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On success the macro HAVE_S390_VX_ASM_SUPPORT is defined. This macro is used |
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to determine if the optimized functions can be build without compile errors. |
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If the used assembler lacks vector support, then a warning is dumped while |
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configuring and only the common code functions are build. |
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The z13 instruction support was introduced in |
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"[Committed] S/390: Add support for IBM z13." |
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(https://sourceware.org/ml/binutils/2015-01/msg00197.html) |
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ChangeLog: |
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* config.h.in (HAVE_S390_VX_ASM_SUPPORT): New macro undefine. |
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* sysdeps/s390/configure.ac: Add test for S390 vector instruction |
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assembler 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 | 39 +++++++++++++++++++++++++++++++++++++++ |
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sysdeps/s390/configure.in | 27 +++++++++++++++++++++++++++ |
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3 files changed, 69 insertions(+) |
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diff --git a/config.h.in b/config.h.in |
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index 68321d4..f7f2388 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 vector instructions on S390. */ |
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+#undef HAVE_S390_VX_ASM_SUPPORT |
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+ |
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/* Define if gcc supports FMA4. */ |
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#undef HAVE_FMA4_SUPPORT |
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diff --git a/sysdeps/s390/configure b/sysdeps/s390/configure |
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index 669bb9b..cc4c1e0 100644 |
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--- a/sysdeps/s390/configure |
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+++ b/sysdeps/s390/configure |
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@@ -3,3 +3,42 @@ |
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$as_echo "#define PI_STATIC_AND_HIDDEN 1" >>confdefs.h |
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+ |
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+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for S390 vector instruction support" >&5 |
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+$as_echo_n "checking for S390 vector instruction support... " >&6; } |
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+if ${libc_cv_asm_s390_vx+:} false; then : |
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+ $as_echo_n "(cached) " >&6 |
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+else |
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+ cat > conftest.c <<\EOF |
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+void testvecinsn () |
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+{ |
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+ __asm__ (".machine \"z13\" \n\t" |
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+ ".machinemode \"zarch_nohighgprs\" \n\t" |
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+ "vistrbs %%v16,%%v17 \n\t" |
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+ "locghie %%r1,0" : :); |
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+} |
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+EOF |
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+if { ac_try='${CC-cc} --shared conftest.c -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_vx=yes |
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+else |
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+ libc_cv_asm_s390_vx=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: $libc_cv_asm_s390_vx" >&5 |
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+$as_echo "$libc_cv_asm_s390_vx" >&6; } |
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+ |
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+if test "$libc_cv_asm_s390_vx" = yes ; |
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+then |
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+ $as_echo "#define HAVE_S390_VX_ASM_SUPPORT 1" >>confdefs.h |
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+ |
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+else |
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+ { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Use binutils with vector-support in order to use optimized implementations." >&5 |
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+$as_echo "$as_me: WARNING: Use binutils with vector-support in order to use optimized implementations." >&2;} |
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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 b5af4e1..733e356 100644 |
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--- a/sysdeps/s390/configure.in |
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+++ b/sysdeps/s390/configure.in |
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@@ -4,3 +4,30 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory. |
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dnl It is always possible to access static and hidden symbols in an |
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dnl position independent way. |
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AC_DEFINE(PI_STATIC_AND_HIDDEN) |
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+ |
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+AC_CACHE_CHECK(for S390 vector instruction support, libc_cv_asm_s390_vx, [dnl |
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+cat > conftest.c <<\EOF |
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+void testvecinsn () |
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+{ |
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+ __asm__ (".machine \"z13\" \n\t" |
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+ ".machinemode \"zarch_nohighgprs\" \n\t" |
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+ "vistrbs %%v16,%%v17 \n\t" |
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+ "locghie %%r1,0" : :); |
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+} |
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+EOF |
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+dnl |
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+dnl test, if assembler supports S390 vector instructions |
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+if AC_TRY_COMMAND([${CC-cc} --shared conftest.c -o conftest.o &> /dev/null]) ; |
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+then |
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+ libc_cv_asm_s390_vx=yes |
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+else |
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+ libc_cv_asm_s390_vx=no |
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+fi |
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+rm -f conftest* ]) |
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+ |
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+if test "$libc_cv_asm_s390_vx" = yes ; |
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+then |
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+ AC_DEFINE(HAVE_S390_VX_ASM_SUPPORT) |
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+else |
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+ AC_MSG_WARN([Use binutils with vector-support in order to use optimized implementations.]) |
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+fi |
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-- |
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2.3.0
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