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Re: [Qemu-devel] [PATCH] tcg: increase MAX_OP_PER_INSTR to 395
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From: |
Joseph Myers |
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Subject: |
Re: [Qemu-devel] [PATCH] tcg: increase MAX_OP_PER_INSTR to 395 |
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Date: |
Fri, 23 Sep 2016 21:49:05 +0000 |
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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