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commit 77d175e14e5f4cf24e9579c03eef5d006a286316
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Author: Naohiro Tamura <naohirot@jp.fujitsu.com>
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Date: Wed May 12 09:26:40 2021 +0000
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config: Added HAVE_AARCH64_SVE_ASM for aarch64
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This patch checks if assembler supports '-march=armv8.2-a+sve' to
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generate SVE code or not, and then define HAVE_AARCH64_SVE_ASM macro.
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Conflicts:
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config.h.in
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(missing PAC+BTI support downstream, missing other ports)
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diff --git a/config.h.in b/config.h.in
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index 8520b0fa8d4668fb..94d5ea367e10f849 100644
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--- a/config.h.in
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+++ b/config.h.in
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@@ -112,6 +112,11 @@
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/* AArch64 big endian ABI */
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#undef HAVE_AARCH64_BE
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+/* Assembler support ARMv8.2-A SVE.
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+ This macro becomes obsolete when glibc increased the minimum
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+ required version of GNU 'binutils' to 2.28 or later. */
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+#define HAVE_AARCH64_SVE_ASM 0
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+
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/* RISC-V integer ABI for ld.so. */
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#undef RISCV_ABI_XLEN
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diff --git a/sysdeps/aarch64/configure b/sysdeps/aarch64/configure
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index f78a79338aba1e34..9fb713155d4ee6d8 100644
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--- a/sysdeps/aarch64/configure
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+++ b/sysdeps/aarch64/configure
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@@ -212,3 +212,31 @@ fi
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$as_echo "$libc_cv_aarch64_variant_pcs" >&6; }
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config_vars="$config_vars
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aarch64-variant-pcs = $libc_cv_aarch64_variant_pcs"
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+
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+# Check if asm support armv8.2-a+sve
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+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for SVE support in assembler" >&5
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+$as_echo_n "checking for SVE support in assembler... " >&6; }
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+if ${libc_cv_asm_sve+:} false; then :
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+ $as_echo_n "(cached) " >&6
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+else
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+ cat > conftest.s <<\EOF
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+ ptrue p0.b
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+EOF
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+if { ac_try='${CC-cc} -c -march=armv8.2-a+sve conftest.s 1>&5'
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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; }; }; 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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+fi
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+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_asm_sve" >&5
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+$as_echo "$libc_cv_asm_sve" >&6; }
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+if test $libc_cv_aarch64_sve_asm = yes; then
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+ $as_echo "#define HAVE_AARCH64_SVE_ASM 1" >>confdefs.h
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+
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+fi
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diff --git a/sysdeps/aarch64/configure.ac b/sysdeps/aarch64/configure.ac
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index 7f13bfb93b60bfd7..0236cfcdf3c8d10d 100644
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--- a/sysdeps/aarch64/configure.ac
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+++ b/sysdeps/aarch64/configure.ac
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@@ -42,3 +42,18 @@ EOF
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fi
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rm -rf conftest.*])
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LIBC_CONFIG_VAR([aarch64-variant-pcs], [$libc_cv_aarch64_variant_pcs])
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+
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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_asm_sve, [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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