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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/114552] [13/14 Regression] wrong code at -O1 and
 above on x86_64-linux-gnu since r13-990
Date: Tue, 02 Apr 2024 13:46:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114552

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The r13-989 to r13-990 difference is
-       movl    k(%rip), %eax
-       movl    %eax, (%rsp)
-       movzwl  k+4(%rip), %eax
-       movw    %ax, 4(%rsp)
+       movw    $1, (%rsp)
+       movl    $0, 2(%rsp)
+       movl    $0, 8(%rsp)
which clearly shows that previously it was copying just 6 bytes from k to
%rsp+0,
while now it directly sets those 6 bytes at %rsp+0 + another 4 bytes at %rs=
p+8.
The last insn is incorrect, shouldn't be there.=