ubuntu-x-swat team mailing list archive

[Robert Hooker <sarvatt@xxxxxxxxx>]

Public bug reported:

Like the summary says, pixman is compiling without SIMD support on arm
when the same package compiled under karmic does enable SIMD support.

The configure.ac check that is failing -

dnl Check for ARM SIMD instructions
ARM_SIMD_CFLAGS="-mcpu=arm1136j-s"

have_arm_simd=no
AC_MSG_CHECKING(whether to use ARM SIMD assembler)
xserver_save_CFLAGS=$CFLAGS
CFLAGS="$ARM_SIMD_CFLAGS $CFLAGS"
AC_COMPILE_IFELSE([
int main () {
    asm("uqadd8 r1, r1, r2");
    return 0;
}], have_arm_simd=yes)
CFLAGS=$xserver_save_CFLAGS

AC_ARG_ENABLE(arm-simd,
   [AC_HELP_STRING([--disable-arm-simd],
                   [disable ARM SIMD fast paths])],
   [enable_arm_simd=$enableval], [enable_arm_simd=auto])

if test $enable_arm_simd = no ; then
   have_arm_simd=disabled
fi

if test $have_arm_simd = yes ; then
   AC_DEFINE(USE_ARM_SIMD, 1, [use ARM SIMD compiler intrinsics])
else
   ARM_SIMD_CFLAGS=
fi

AC_MSG_RESULT($have_arm_simd)
if test $enable_arm_simd = yes && test $have_arm_simd = no ; then
   AC_MSG_ERROR([ARM SIMD intrinsics not detected])
fi

AC_SUBST(ARM_SIMD_CFLAGS)

AM_CONDITIONAL(USE_ARM_SIMD, test $have_arm_simd = yes)


from #ubuntu-arm irc with a fix-
<lool> Sarvatt: Quick workaround for you: add CFLAGS+=-marm in debian/rules

** Affects: pixman (Ubuntu)
     Importance: Undecided
         Status: New

-- 
pixman doesn't autodetect SIMD support at build time on arm.
https://bugs.launchpad.net/bugs/535183
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