From: Richard Henderson <richard.henderson@linaro.org>
To: Nicholas Piggin <npiggin@gmail.com>, qemu-devel@nongnu.org
Cc: jniethe5@gmail.com, qemu-ppc@nongnu.org, bgray@linux.ibm.com
Subject: Re: [PATCH for-8.2 0/7] tcg/ppc: Support power10 prefixed instructions
Date: Sun, 6 Aug 2023 07:22:35 -0700 [thread overview]
Message-ID: <cbfde403-9720-aa96-508c-34c855b7400c@linaro.org> (raw)
In-Reply-To: <CULFY7505V8V.16ZJ1H7XXFRVT@wheely>
On 8/6/23 04:55, Nicholas Piggin wrote:
> On Sat Aug 5, 2023 at 7:33 AM AEST, Richard Henderson wrote:
>> Emit one 64-bit instruction for large constants and pc-relatives.
>> With pc-relative addressing, we don't need REG_TB, which means we
>> can re-enable direct branching for goto_tb.
>
> Very cool. I tested this on a POWER10 and it has been stable so
> far. Using mttcg with SMP 8 machine, with this patch, a parallel
> gcc compile job in a Linux distro is 11.5% faster. Is such a big
> improvment expected?
Possibly, given that we had to disable direct branch patching for USE_REG_TB.
r~
prev parent reply other threads:[~2023-08-06 14:23 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-04 21:33 [PATCH for-8.2 0/7] tcg/ppc: Support power10 prefixed instructions Richard Henderson
2023-08-04 21:33 ` [PATCH 1/7] tcg/ppc: Untabify tcg-target.c.inc Richard Henderson
2023-08-04 21:33 ` [PATCH 2/7] tcg/ppc: Use PADDI in tcg_out_movi Richard Henderson
2023-08-07 3:53 ` Jordan Niethe
2023-08-07 21:26 ` Richard Henderson
2023-08-04 21:33 ` [PATCH 3/7] tcg/ppc: Use prefixed instructions in tcg_out_mem_long Richard Henderson
2023-08-07 3:51 ` Jordan Niethe
2023-08-04 21:33 ` [PATCH 4/7] tcg/ppc: Use PLD in tcg_out_movi for constant pool Richard Henderson
2023-08-04 21:33 ` [PATCH 5/7] tcg/ppc: Use prefixed instructions in tcg_out_dupi_vec Richard Henderson
2023-08-04 21:33 ` [PATCH 6/7] tcg/ppc: Disable USE_REG_TB for Power v3.1 Richard Henderson
2023-08-06 11:58 ` Nicholas Piggin
2023-08-06 13:45 ` Richard Henderson
2023-08-04 21:33 ` [PATCH 7/7] tcg/ppc: Use prefixed instructions for tcg_out_goto_tb Richard Henderson
2023-08-06 12:55 ` Nicholas Piggin
2023-08-06 14:13 ` Richard Henderson
2023-08-07 1:51 ` Nicholas Piggin
2023-08-07 7:29 ` Nicholas Piggin
2023-08-07 9:38 ` Nicholas Piggin
2023-08-07 4:08 ` Jordan Niethe
2023-08-06 11:55 ` [PATCH for-8.2 0/7] tcg/ppc: Support power10 prefixed instructions Nicholas Piggin
2023-08-06 14:22 ` Richard Henderson [this message]
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