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Re: [Qemu-devel] [PATCH] tcg: increase MAX_OP_PER_INSTR to 395


From: Joseph Myers
Subject: Re: [Qemu-devel] [PATCH] tcg: increase MAX_OP_PER_INSTR to 395
Date: Fri, 23 Sep 2016 21:49:05 +0000
User-agent: Alpine 2.20 (DEB 67 2015-01-07)

On Fri, 23 Sep 2016, Richard Henderson wrote:

> While increasing the max per insn is indeed one way to approach this, aarch64
> is being remarkably inefficient in this case.  With the following, I see a
> reduction from 387 ops to 261 ops; for a 64-bit host, the reduction is from
> 258 ops to 195 ops.

261 ops plus ops generated in gen_intermediate_code_a64 after the loop 
plus ops from optimization may still require an increase from 266, of 
course (I don't know how to bound the number of ops space must still be 
available for after translating an instruction has resulted in 
tcg_op_buf_full() being true, but my testing had cases where it was at 
least 8).

-- 
Joseph S. Myers
address@hidden



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