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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/105546] [11/12/13 Regression] ifconversion introduces many compares with loads
Date: Tue, 10 May 2022 21:02:49 +0000 [thread overview]
Message-ID: <bug-105546-4-VQsKF7Z7gJ@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-105546-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105546
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Target| |x86_64-linux-gnu
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2022-05-10
Target Milestone|--- |11.4
Summary|load introduction when |[11/12/13 Regression]
|initializing a struct |ifconversion introduces
| |many compares with loads
Component|middle-end |target
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is ifconversion changing:
if (g_344.0_1 != 0)
goto <bb 4>; [50.00%]
else
goto <bb 3>; [50.00%]
<bb 3> [local count: 536870912]:
<bb 4> [local count: 1073741824]:
# _16 = PHI <4499926296329723445(2), -6(3)>
# _18 = PHI <3(2), 3409572933270154779(3)>
# _20 = PHI <171(2), 161(3)>
# _22 = PHI <-1(2), -8(3)>
# _24 = PHI <27943(2), 1(3)>
# _26 = PHI <2738(2), 65526(3)>
Into straight line code but keeps the load around.
THis is a target issue.
next prev parent reply other threads:[~2022-05-10 21:02 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-10 11:34 [Bug rtl-optimization/105546] New: load introduction when copying a struct absoler at smail dot nju.edu.cn
2022-05-10 11:44 ` [Bug rtl-optimization/105546] load introduction when initializing " absoler at smail dot nju.edu.cn
2022-05-10 21:02 ` pinskia at gcc dot gnu.org [this message]
2022-05-11 7:20 ` [Bug target/105546] [11/12/13 Regression] ifconversion introduces many compares with loads rguenth at gcc dot gnu.org
2022-10-19 10:06 ` rguenth at gcc dot gnu.org
2022-10-19 10:07 ` rguenth at gcc dot gnu.org
2023-01-13 21:30 ` roger at nextmovesoftware dot com
2023-05-29 10:07 ` [Bug target/105546] [11/12/13/14 " jakub at gcc dot gnu.org
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