From: Richard Henderson <rth@twiddle.net>
To: "Philippe Mathieu-Daudé" <f4bug@amsat.org>,
"Laurent Vivier" <laurent@vivier.eu>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 2/6] target/m68k: Optimize the partset instruction using deposit_i32()
Date: Mon, 11 Mar 2019 07:46:51 -0700 [thread overview]
Message-ID: <0c82bc13-532d-f450-7bd5-df9e36f24d33@twiddle.net> (raw)
In-Reply-To: <20190310003428.11723-3-f4bug@amsat.org>
On 3/9/19 4:34 PM, Philippe Mathieu-Daudé wrote:
> case OS_BYTE:
> - tcg_gen_andi_i32(reg, reg, 0xffffff00);
> tmp = tcg_temp_new();
> tcg_gen_ext8u_i32(tmp, val);
Might as well elide this as well.
> - tcg_gen_or_i32(reg, reg, tmp);
> + tcg_gen_deposit_i32(reg, tmp, reg, 8, 24);
> tcg_temp_free(tmp);
> break;
> case OS_WORD:
> - tcg_gen_andi_i32(reg, reg, 0xffff0000);
> tmp = tcg_temp_new();
> tcg_gen_ext16u_i32(tmp, val);
Likewise.
> - tcg_gen_or_i32(reg, reg, tmp);
> + tcg_gen_deposit_i32(reg, tmp, reg, 16, 16);
> tcg_temp_free(tmp);
> break;
next prev parent reply other threads:[~2019-03-11 14:57 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-10 0:34 [Qemu-devel] [PATCH 0/6] target/m68k: Optimize few instructions using deposit/extraxt_i32() Philippe Mathieu-Daudé
2019-03-10 0:34 ` [Qemu-devel] [PATCH 1/6] target/m68k: Reduce the l1 TCGLabel scope Philippe Mathieu-Daudé
2019-03-11 14:46 ` Richard Henderson
2019-03-10 0:34 ` [Qemu-devel] [PATCH 2/6] target/m68k: Optimize the partset instruction using deposit_i32() Philippe Mathieu-Daudé
2019-03-11 14:46 ` Richard Henderson [this message]
2019-03-10 0:34 ` [Qemu-devel] [PATCH 3/6] target/m68k: Fix a tcg_temp leak Philippe Mathieu-Daudé
2019-03-11 14:48 ` Richard Henderson
2019-03-10 0:34 ` [Qemu-devel] [PATCH 4/6] target/m68k: Optimize get_sr() using deposit_i32() Philippe Mathieu-Daudé
2019-03-11 14:52 ` Richard Henderson
2019-03-10 0:34 ` [Qemu-devel] [PATCH 5/6] target/m68k: Optimize rotate_x() using extract_i32() Philippe Mathieu-Daudé
2019-03-11 14:59 ` Richard Henderson
2019-03-10 0:34 ` [Qemu-devel] [PATCH 6/6] target/m68k: Reduce the scope of the 'zero' tcg_temp Philippe Mathieu-Daudé
2019-03-11 14:58 ` Richard Henderson
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