From: Jeff Law <jeffreyalaw@gmail.com>
To: Kito Cheng <kito.cheng@sifive.com>,
"Wang, Yanzhang" <yanzhang.wang@intel.com>
Cc: "gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>,
"juzhe.zhong@rivai.ai" <juzhe.zhong@rivai.ai>,
"Li, Pan2" <pan2.li@intel.com>
Subject: Re: [PATCH v3] RISC-V: Fix regression of -fzero-call-used-regs=all
Date: Mon, 10 Apr 2023 14:57:43 -0600 [thread overview]
Message-ID: <e26e1337-f181-37ad-0b4e-11e639df4dd5@gmail.com> (raw)
In-Reply-To: <CALLt3TiW=LGG0TN7ZBxKxDEmSQJ61FPbW+ojFhO4Tq_2GYKRUw@mail.gmail.com>
On 4/9/23 21:11, Kito Cheng wrote:
> I think one keypoint here is -fzero-call-used-regs=* emit zeroing
> instruction before return, that means there won't be any vector
> operations between return and zeroing instructions, so we don't need
> to restore the vcsr after zeroing.
Oh yea, makes perfect sense. Thanks.
jeff
next prev parent reply other threads:[~2023-04-10 20:57 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-06 13:34 [PATCH] " yanzhang.wang
2023-04-06 13:47 ` juzhe.zhong
2023-04-06 14:59 ` Kito Cheng
2023-04-07 6:59 ` [PATCH v2] " yanzhang.wang
2023-04-07 7:07 ` Kito Cheng
2023-04-07 12:32 ` [PATCH v3] " yanzhang.wang
2023-04-08 18:39 ` Jeff Law
2023-04-10 2:21 ` Wang, Yanzhang
2023-04-10 3:11 ` Kito Cheng
2023-04-10 20:57 ` Jeff Law [this message]
2023-04-10 3:00 ` [PATCH v4] " yanzhang.wang
2023-04-11 11:37 ` [PATCH v5] " yanzhang.wang
2023-04-11 12:00 ` Wang, Yanzhang
2023-04-11 14:11 ` Kito Cheng
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