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From: "roland.illig at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103457] boolean operations on bit-fields are not merged
Date: Sun, 28 Nov 2021 23:20:18 +0000	[thread overview]
Message-ID: <bug-103457-4-9Wen3BnvI0@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-103457-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103457

--- Comment #2 from Roland Illig <roland.illig at gmx dot de> ---
Cool, thank you for taking this optimization.

Just to give you a bit of background: I discovered this while converting some
of the enum types in BSD Make to proper bitfields, which theoretically should
be possible without affecting the generated code.

https://github.com/NetBSD/src/blob/trunk/usr.bin/make/make.h

It was interesting to play around with this code on https://godbolt.org/,
seeing how differently the available compilers translate this simple code
fragment. That's where the Intel assembler syntax comes from. :)

  parent reply	other threads:[~2021-11-28 23:20 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-28 19:58 [Bug tree-optimization/103457] New: " roland.illig at gmx dot de
2021-11-28 22:27 ` [Bug tree-optimization/103457] " pinskia at gcc dot gnu.org
2021-11-28 23:20 ` roland.illig at gmx dot de [this message]
2021-11-29  8:52 ` marxin at gcc dot gnu.org
2023-04-26  6:55 ` rguenth at gcc dot gnu.org
2023-07-27  9:22 ` rguenth at gcc dot gnu.org
2024-05-21  9:10 ` jakub at gcc dot gnu.org

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