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cd94326a13
This patch enables libmvec on AArch64. The proposed change is mainly implementing build infrastructure to add the new routines to ABI, tests and benchmarks. I have demonstrated how this all fits together by adding implementations for vector cos, in both single and double precision, targeting both Advanced SIMD and SVE. The implementations of the routines themselves are just loops over the scalar routine from libm for now, as we are more concerned with getting the plumbing right at this point. We plan to contribute vector routines from the Arm Optimized Routines repo that are compliant with requirements described in the libmvec wiki. Building libmvec requires minimum GCC 10 for SVE ACLE. To avoid raising the minimum GCC by such a big jump, we allow users to disable libmvec if their compiler is too old. Note that at this point users have to manually call the vector math functions. This seems to be acceptable to some downstream users. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
120 lines
4.0 KiB
Plaintext
120 lines
4.0 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
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# Local configure fragment for sysdeps/aarch64.
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# Static PIE is supported.
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AC_DEFINE(SUPPORT_STATIC_PIE)
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# We check to see if the compiler and flags are
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# selecting the big endian ABI and if they are then
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# we set libc_cv_aarch64_be to yes which causes
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# HAVE_AARCH64_BE to be defined in config.h and
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# in include/libc-symbols.h and thus available to
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# shlib-versions to select the appropriate name for
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# the dynamic linker via %ifdef.
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AC_CACHE_CHECK([for big endian],
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[libc_cv_aarch64_be],
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[AC_EGREP_CPP(yes,[#ifdef __AARCH64EB__
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yes
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#endif
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], libc_cv_aarch64_be=yes, libc_cv_aarch64_be=no)])
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if test $libc_cv_aarch64_be = yes; then
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AC_DEFINE(HAVE_AARCH64_BE)
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LIBC_CONFIG_VAR([default-abi], [lp64_be])
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else
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LIBC_CONFIG_VAR([default-abi], [lp64])
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fi
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# Only consider BTI supported if -mbranch-protection=bti is
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# on by default in the compiler and the linker produces
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# binaries with GNU property notes in PT_GNU_PROPERTY segment.
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AC_CACHE_CHECK([for BTI support], [libc_cv_aarch64_bti], [dnl
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cat > conftest.c <<EOF
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void foo (void) { }
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EOF
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libc_cv_aarch64_bti=no
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if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostdlib -nostartfiles $no_ssp -shared -fPIC -o conftest.so conftest.c]) \
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&& AC_TRY_COMMAND([$READELF -lW conftest.so | grep -q GNU_PROPERTY]) \
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&& AC_TRY_COMMAND([$READELF -nW conftest.so | grep -q "NT_GNU_PROPERTY_TYPE_0.*AArch64 feature:.* BTI"])
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then
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libc_cv_aarch64_bti=yes
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fi
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rm -rf conftest.*])
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LIBC_CONFIG_VAR([aarch64-bti], [$libc_cv_aarch64_bti])
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if test $libc_cv_aarch64_bti = yes; then
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AC_DEFINE(HAVE_AARCH64_BTI)
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fi
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# Check if glibc is built with return address signing, i.e.
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# if -mbranch-protection=pac-ret is on. We need this because
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# pac-ret relies on unwinder support so it's not safe to use
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# it in assembly code unconditionally, but there is no
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# feature test macro for it in gcc.
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AC_CACHE_CHECK([if pac-ret is enabled], [libc_cv_aarch64_pac_ret], [dnl
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cat > conftest.c <<EOF
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int bar (void);
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int foo (void) { return bar () + 1; }
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EOF
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libc_cv_aarch64_pac_ret=no
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if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -o conftest.s conftest.c]) \
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&& AC_TRY_COMMAND([grep -q -E '\''(hint( | )+25|paciasp)'\'' conftest.s])
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then
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libc_cv_aarch64_pac_ret=yes
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fi
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rm -rf conftest.*])
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if test $libc_cv_aarch64_pac_ret = yes; then
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AC_DEFINE(HAVE_AARCH64_PAC_RET)
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fi
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# Check if binutils supports variant PCS symbols.
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AC_CACHE_CHECK([for variant PCS support], [libc_cv_aarch64_variant_pcs], [dnl
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cat > conftest.S <<EOF
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.global foo
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.type foo, %function
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.variant_pcs foo
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foo:
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ret
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.global bar
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.type bar, %function
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bar:
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b foo
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EOF
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libc_cv_aarch64_variant_pcs=no
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if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostdlib -nostartfiles $no_ssp -shared -fPIC -o conftest.so conftest.S]) \
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&& AC_TRY_COMMAND([$READELF -dW conftest.so | grep -q AARCH64_VARIANT_PCS])
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then
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libc_cv_aarch64_variant_pcs=yes
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fi
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rm -rf conftest.*])
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LIBC_CONFIG_VAR([aarch64-variant-pcs], [$libc_cv_aarch64_variant_pcs])
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# Check if asm support armv8.2-a+sve
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AC_CACHE_CHECK([for SVE support in assembler], [libc_cv_aarch64_sve_asm], [dnl
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cat > conftest.s <<\EOF
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ptrue p0.b
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EOF
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if AC_TRY_COMMAND(${CC-cc} -c -march=armv8.2-a+sve conftest.s 1>&AS_MESSAGE_LOG_FD); then
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libc_cv_aarch64_sve_asm=yes
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else
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libc_cv_aarch64_sve_asm=no
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fi
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rm -f conftest*])
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if test $libc_cv_aarch64_sve_asm = yes; then
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AC_DEFINE(HAVE_AARCH64_SVE_ASM)
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fi
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if test x"$build_mathvec" = xnotset; then
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build_mathvec=yes
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fi
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# Check if compiler is sufficient to build mathvec (needs SVE ACLE)
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AC_CACHE_CHECK(for availability of SVE ACLE, libc_cv_has_sve_acle, [dnl
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if test $build_mathvec = yes; then
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cat > conftest.c <<EOF
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#include <arm_sve.h>
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EOF
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if ! ${CC-cc} conftest.c -fsyntax-only; then
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as_fn_error 1 "mathvec is enabled but compiler does not have SVE ACLE. Either use a compatible compiler or configure with --disable-mathvec (this results in incomplete ABI)."
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fi
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rm conftest.c
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fi])
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