Re: [Qemu-devel] [PATCH v2 00/26] tcg: rework liveness analysis and register allocator

[Richard Henderson]

On 10/10/2012 12:42 AM, Aurelien Jarno wrote:
>> > - constant propagation using constraints.  This would let tcg-i386 use
>> > effectively the mov $imm,(addr) instruction for spills of known-constant
>> > values.
> This is indeed something quite frustrating and even more when the
> same immediate value is loaded multiple time. One way to do that would
> be to provide an optional tcg_out_st_immediate().

I think it should be possible to "simulate" a tcg opcode for this,
without having to have a specific entry point for it.  We've already
got all the information we need from the backend in the form of
constraints...


r~