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From: "williambader at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/89965] [8 Regression] wrong code with -O
 -mtune=nano-x2 -fcaller-saves -fexpensive-optimizations -fno-tree-dce
 -fno-tree-ter
Date: Mon, 15 Mar 2021 00:41:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D89965

--- Comment #18 from William Bader <williambader at hotmail dot com> ---
I did a bisection for the bug from my previous comment (which is still pres=
ent
in the current gcc 11 in master):

058e97ecf33ad0dfd926b3876a4bcf59ac9556ff is the first bad commit
commit 058e97ecf33ad0dfd926b3876a4bcf59ac9556ff
Author: Vladimir Makarov <vmakarov@redhat.com>
Date:   Tue Aug 26 12:39:58 2008 +0000

`git diff '058e97ecf33ad0dfd926b3876a4bcf59ac9556ff^!' | wc -l` shows 16192
lines.

gcc/caller-save.c has a lot of changes. I want it fixed in the current gcc.=
 I
don't care about gcc 4, other than that the git bisect found that the bug w=
as
introduced in a commit to gcc 4. Is it worth trying to fix it in gcc 4, or
would that just waste time making a patch that would not apply to the curre=
nt
gcc?=