Am 05.07.2012 15:23, schrieb Yeongkyoon Lee:
> Add an option "--enable-ldst-optimization" to enable
> CONFIG_QEMU_LDST_OPTIMIZATION macro for TCG qemu_ld/st optimization. It only
> works with CONFIG_SOFTMMU and doesn't work with CONFIG_TCG_PASS_AREG0.
>
> Signed-off-by: Yeongkyoon Lee <yeongkyoon....@samsung.com>
> ---
> configure | 15 +++++++++++++++
> 1 files changed, 15 insertions(+), 0 deletions(-)
>
> diff --git a/configure b/configure
> index 9f071b7..2b364cc 100755
> --- a/configure
> +++ b/configure
[...]
> @@ -3463,6 +3466,11 @@ echo "EXESUF=$EXESUF" >> $config_host_mak
> echo "LIBS_QGA+=$libs_qga" >> $config_host_mak
> echo "POD2MAN=$POD2MAN" >> $config_host_mak
>
> +if [ "$ldst_optimization" = "yes" -a "$cpu" != "i386" -a "$cpu" != "x86_64"
> ] ; then
> + echo "ERROR: qemu_ld/st optimization is only available on i386 or x86_64
> hosts"
> + exit 1
> +fi
[snip]
I assume that Samsung is interested in optimizing the Exynos emulation.
I think there was already a patchset posted converting target-arm to
CONFIG_PASS_TCG_AREG0, only with some slowdowns to be investigated...
What is the obstacle for supporting AREG0 mode in your optimization?
Regards,
Andreas
> +
> # generate list of library paths for linker script
>
> $ld --verbose -v 2> /dev/null | grep SEARCH_DIR > ${config_host_ld}
> @@ -3696,11 +3704,18 @@ fi
> symlink "$source_path/Makefile.target" "$target_dir/Makefile"
>
>
> +target_ldst_optimization="$ldst_optimization"
> +
> case "$target_arch2" in
> alpha | sparc* | xtensa* | ppc*)
> echo "CONFIG_TCG_PASS_AREG0=y" >> $config_target_mak
> + # qemu_ld/st optimization is not available with CONFIG_TCG_PASS_AREG0
> + target_ldst_optimization="no"
> ;;
> esac
> +if [ "$target_ldst_optimization" = "yes" -a "$target_softmmu" = "yes" ] ;
> then
> + echo "CONFIG_QEMU_LDST_OPTIMIZATION=y" >> $config_target_mak
> +fi
>
> echo "TARGET_SHORT_ALIGNMENT=$target_short_alignment" >> $config_target_mak
> echo "TARGET_INT_ALIGNMENT=$target_int_alignment" >> $config_target_mak
--
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