diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 8231e67..9db0131 100644 --- a/configure.ac +++ b/configure.ac @@ -667,6 +667,40 @@ if test $enable_arm_neon = yes && test $have_arm_neon = no ; then AC_MSG_ERROR([ARM NEON intrinsics not detected]) fi +dnl ========================================================================== +dnl Check if assembler is gas compatible and supports ARM-a64 NEON instructions +have_arm_a64_neon=no +AC_MSG_CHECKING(whether to use ARM A64 NEON assembler) +xserver_save_CFLAGS=$CFLAGS +CFLAGS="-x assembler-with-cpp $CFLAGS" +AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ +.text +.arch armv8-a +.altmacro +prfm pldl2strm, [x0] +xtn v0.8b, v0.8h]])], have_arm_a64_neon=yes) +CFLAGS=$xserver_save_CFLAGS + +AC_ARG_ENABLE(arm-a64-neon, + [AC_HELP_STRING([--disable-arm-a64-neon], + [disable ARM A64 NEON fast paths])], + [enable_arm_a64_neon=$enableval], [enable_arm_a64_neon=auto]) + +if test $enable_arm_a64_neon = no ; then + have_arm_a64_neon=disabled +fi + +if test $have_arm_a64_neon = yes ; then + AC_DEFINE(USE_ARM_A64_NEON, 1, [use ARM A64_NEON assembly optimizations]) +fi + +AM_CONDITIONAL(USE_ARM_A64_NEON, test $have_arm_a64_neon = yes) + +AC_MSG_RESULT($have_arm_a64_neon) +if test $enable_arm_a64_neon = yes && test $have_arm_a64_neon4 = no ; then + AC_MSG_ERROR([ARM A64 NEON intrinsics not detected]) +fi + dnl =========================================================================== dnl Check for IWMMXT |