Re: prevent GCC from re-arranging two emit_insn()

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To: William Tambe <tambewilliam@xxxxxxxxx>
Subject: Re: prevent GCC from re-arranging two emit_insn()
From: Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx>
Date: Thu, 11 Apr 2019 20:15:55 -0500
Cc: Jeff Law <law@xxxxxxxxxx>, gcc-help <gcc-help@xxxxxxxxxxx>
In-reply-to: <CAF8i9mN0JJeEBtnPrS4fDyXZTq=bmQAVMZ_pxYdx-Qvw-42VZA@mail.gmail.com>
References: <CAF8i9mMDK0Vyq_bj9GFZAm9DLxLki6MYNRFd9pUPEPuYwEq+4Q@mail.gmail.com> <6dfd9160-b04f-452e-100d-7df06d95e004@redhat.com> <CAF8i9mN0JJeEBtnPrS4fDyXZTq=bmQAVMZ_pxYdx-Qvw-42VZA@mail.gmail.com>
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On Thu, Apr 11, 2019 at 03:43:48PM -0500, William Tambe wrote:
> Wouldn't the blockage insn prevent the compiler from re-arranging
> other following instructions ?

Yes.

> In fact, the two emit_insn() need to be seen as one instruction with
> the compiler free to re-arrange other instructions around it.

Then why not *make* them one (rtl) insn?


Segher

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