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From: "bisqwit at iki dot fi" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/58195] Missed optimization opportunity when returning a conditional
Date: Tue, 11 Mar 2014 13:28:00 -0000	[thread overview]
Message-ID: <bug-58195-4-i2DbqIYcXt@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-58195-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58195

Joel Yliluoma <bisqwit at iki dot fi> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bisqwit at iki dot fi

--- Comment #1 from Joel Yliluoma <bisqwit at iki dot fi> ---
Problem confirmed on "gcc (GCC) 4.9.0 20140303 (experimental)" (SVN version) in
both 32-bit and 64-bit mode using -Ofast.

For comparison, Clang++ produces this instead (even on -O1): 

        negl    %edi
        movl    %edi, %eax
        ret

GCC misses an optimization opportunity here.


  reply	other threads:[~2014-03-11 13:28 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-08-19 19:24 [Bug rtl-optimization/58195] New: " warp at iki dot fi
2014-03-11 13:28 ` bisqwit at iki dot fi [this message]
2014-03-11 13:32 ` [Bug tree-optimization/58195] " rguenth at gcc dot gnu.org
2014-03-11 13:44 ` glisse at gcc dot gnu.org
2020-04-10  9:24 ` bisqwit at iki dot fi
2021-05-24  7:14 ` pinskia at gcc dot gnu.org
2021-06-05  1:28 ` pinskia at gcc dot gnu.org
2021-11-17  9:56 ` pinskia at gcc dot gnu.org
2022-11-19 23:24 ` pinskia at gcc dot gnu.org

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