X-Git-Url: https://git.distorted.org.uk/~mdw/catacomb/blobdiff_plain/f013a4f2faa9d42d153daded532767f6685c38c0..26e182fc3ae2a40dc7d52bab2318d8d1837dfeee:/configure.ac

diff --git a/configure.ac b/configure.ac
index 1802a8a0..86f7944a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -172,6 +172,40 @@ case $CPUFAM in
 esac
 
 dnl--------------------------------------------------------------------------
+dnl CPU-specific assembler features.
+
+AC_LANG([CPPAS])
+
+case $CPUFAM in
+  armel)
+    AC_CACHE_CHECK(
+      [whether the assembler understands ARMv8 crypto extensions],
+      [mdw_cv_as_armv8_crypto],
+      [AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+	.arch	armv8-a
+	.fpu	crypto-neon-fp-armv8
+
+	.text
+	.globl	foo
+foo:
+	vldmia	r0, {d0-d3}
+	aese.8	q0, q1
+	aesmc.8	q0, q0
+	vstmia	r0, {d0, d1}
+	bx	r14]])],
+	 [mdw_cv_as_armv8_crypto=yes],
+	 [mdw_cv_as_armv8_crypto=no])])
+    ;;
+esac
+
+: ${mdw_cv_as_armv8_crypto=no}
+AM_CONDITIONAL([HAVE_AS_ARMV8_CRYPTO], [test $mdw_cv_as_armv8_crypto = yes])
+if test $mdw_cv_as_armv8_crypto = yes; then
+  AC_DEFINE([HAVE_AS_ARMV8_CRYPTO], [1],
+    [Define to 1 if your ARM assembler supports the ARMv8 crypto instructions.])
+fi
+
+dnl--------------------------------------------------------------------------
 dnl C programming environment.
 
 AC_LANG([C])