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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.
70 lines
1.9 KiB
Plaintext
70 lines
1.9 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
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# Local configure fragment for sysdeps/s390.
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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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dnl Accept as 2.24 or newer.
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AC_CHECK_PROG_VER(AS, $AS, --version,
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[GNU assembler.* \([0-9]*\.[0-9.]*\)],
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[2.2[4-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing The program AS is required in version >= 2.24 for target S390.")
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AC_CACHE_CHECK(for __builtin_tbegin, libc_cv_gcc_builtin_tbegin, [dnl
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cat > conftest.c <<\EOF
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#include <htmintrin.h>
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void testtransaction ()
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{
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if (__builtin_tbegin (0) == _HTM_TBEGIN_STARTED)
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{
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__builtin_tend ();
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}
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}
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EOF
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dnl
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dnl test, if the tbegin instruction is used by __builtin_tbegin
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if AC_TRY_COMMAND([${CC-cc} -mhtm -O2 -S conftest.c -o - | grep -w tbegin > /dev/null]) ;
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then
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libc_cv_gcc_builtin_tbegin=yes
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else
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libc_cv_gcc_builtin_tbegin=no
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fi
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rm -f conftest* ])
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if test "$enable_lock_elision" = yes && test "$libc_cv_gcc_builtin_tbegin" = no ; then
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critic_missing="$critic_missing The used GCC has no support for __builtin_tbegin, which is needed for lock-elision on target S390."
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fi
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AC_CACHE_CHECK(for S390 vector instruction support, libc_cv_asm_s390_vx, [dnl
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cat > conftest.c <<\EOF
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void testvecinsn ()
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{
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__asm__ (".machine \"z13\" \n\t"
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".machinemode \"zarch_nohighgprs\" \n\t"
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"vistrbs %%v16,%%v17 \n\t"
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"locghie %%r1,0" : :);
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}
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EOF
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dnl
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dnl test, if assembler supports S390 vector instructions
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if AC_TRY_COMMAND([${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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if test "$libc_cv_asm_s390_vx" = yes ;
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then
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AC_DEFINE(HAVE_S390_VX_ASM_SUPPORT)
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else
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AC_MSG_WARN([Use binutils with vector-support in order to use optimized implementations.])
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fi
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test -n "$critic_missing" && AC_MSG_ERROR([
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*** $critic_missing])
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