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Re: [Qemu-devel] [RFC][PATCH v2 4/4] configure: add CONFIG_QEMU_LDST_OPT
Re: [Qemu-devel] [RFC][PATCH v2 4/4] configure: add CONFIG_QEMU_LDST_OPTIMIZATION for TCG qemu_ld/st optimization
Sun, 08 Jul 2012 17:35:36 +0900
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On 2012년 07월 07일 16:51, Blue Swirl wrote:
On Fri, Jul 6, 2012 at 11:43 AM, Yeongkyoon Lee
On 2012년 07월 05일 23:06, Peter Maydell wrote:
On 5 July 2012 14:23, Yeongkyoon Lee <address@hidden> wrote:
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.
This shouldn't be a user settable config option -- we should
just identify what the optimal setting is for the guest/target
combination and use it.
It looks better remove the option after it is confirmed that it works well
for all the guest target architectures.
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
PASS_AREG0 is the way of the future -- you need to fix the ldst
optimization to work with it.
There are two reasons to prevent working with PASS_AREG0.
The first one is I'm not sure the history and future PASS_AREG0 and have not
tested PASS_AREG0 which is only enabled for some guest architectures..
The second is a problem of too many conditional paths in sources.
I think it is not late to combine the ldst optimization with PASS_AREG0
after the ldst optimization agreed as default.
It looks like you already support PASS_AREG0, the slow path code just
passes AREG0 as the first call argument.
The code in slow path is currently dead code just for future PASS_AREG0
It needs some porting for actual working.
[Qemu-devel] [RFC][PATCH v2 4/4] configure: add CONFIG_QEMU_LDST_OPTIMIZATION for TCG qemu_ld/st optimization, Yeongkyoon Lee, 2012/07/05
Re: [Qemu-devel] [RFC][PATCH v2 0/4] tcg: enhance code generation quality for qemu_ld/st IRs, Yeongkyoon Lee, 2012/07/10
- Re: [Qemu-devel] [RFC][PATCH v2 3/4] tcg: add optimized TCG qemu_ld/st generation, (continued)