config: Added HAVE_AARCH64_SVE_ASM for aarch64

This patch checks if assembler supports '-march=armv8.2-a+sve' to
generate SVE code or not, and then define HAVE_AARCH64_SVE_ASM macro.

diff --git a/config.h.in b/config.h.in
index d54c8c5..dbeb7c6 100644 (file)
--- a/config.h.in
+++ b/config.h.in
@@ -121,6 +121,11 @@
 /* AArch64 PAC-RET code generation is enabled.  */
 #define HAVE_AARCH64_PAC_RET 0
 
+/* Assembler support ARMv8.2-A SVE.
+   This macro becomes obsolete when glibc increased the minimum
+   required version of GNU 'binutils' to 2.28 or later. */
+#define HAVE_AARCH64_SVE_ASM 0
+
 /* ARC big endian ABI */
 #undef HAVE_ARC_BE
 

diff --git a/sysdeps/aarch64/configure b/sysdeps/aarch64/configure
index 83c3a23..4c1fac4 100644 (file)
--- a/sysdeps/aarch64/configure
+++ b/sysdeps/aarch64/configure
@@ -304,3 +304,31 @@ fi
 $as_echo "$libc_cv_aarch64_variant_pcs" >&6; }
 config_vars="$config_vars
 aarch64-variant-pcs = $libc_cv_aarch64_variant_pcs"
+
+# Check if asm support armv8.2-a+sve
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for SVE support in assembler" >&5
+$as_echo_n "checking for SVE support in assembler... " >&6; }
+if ${libc_cv_asm_sve+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat > conftest.s <<\EOF
+        ptrue p0.b
+EOF
+if { ac_try='${CC-cc} -c -march=armv8.2-a+sve conftest.s 1>&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then
+  libc_cv_aarch64_sve_asm=yes
+else
+  libc_cv_aarch64_sve_asm=no
+fi
+rm -f conftest*
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_asm_sve" >&5
+$as_echo "$libc_cv_asm_sve" >&6; }
+if test $libc_cv_aarch64_sve_asm = yes; then
+  $as_echo "#define HAVE_AARCH64_SVE_ASM 1" >>confdefs.h
+
+fi

diff --git a/sysdeps/aarch64/configure.ac b/sysdeps/aarch64/configure.ac
index 66f7550..3347c13 100644 (file)
--- a/sysdeps/aarch64/configure.ac
+++ b/sysdeps/aarch64/configure.ac
@@ -90,3 +90,18 @@ EOF
   fi
   rm -rf conftest.*])
 LIBC_CONFIG_VAR([aarch64-variant-pcs], [$libc_cv_aarch64_variant_pcs])
+
+# Check if asm support armv8.2-a+sve
+AC_CACHE_CHECK(for SVE support in assembler, libc_cv_asm_sve, [dnl
+cat > conftest.s <<\EOF
+        ptrue p0.b
+EOF
+if AC_TRY_COMMAND(${CC-cc} -c -march=armv8.2-a+sve conftest.s 1>&AS_MESSAGE_LOG_FD); then
+  libc_cv_aarch64_sve_asm=yes
+else
+  libc_cv_aarch64_sve_asm=no
+fi
+rm -f conftest*])
+if test $libc_cv_aarch64_sve_asm = yes; then
+  AC_DEFINE(HAVE_AARCH64_SVE_ASM)
+fi