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From: "linkw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug testsuite/102658] [12 regression] Many test case failures after
 r12-4240
Date: Sat, 09 Oct 2021 02:04:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102658

--- Comment #3 from Kewen Lin <linkw at gcc dot gnu.org> ---
Some new XPASS:
XFAIL->XPASS: gcc.dg/Wstringop-overflow-68.c pr101475 (test for warnings, l=
ine
61)
XFAIL->XPASS: gcc.dg/Wstringop-overflow-68.c pr101475 (test for warnings, l=
ine
62)
XFAIL->XPASS: gcc.dg/Wstringop-overflow-68.c pr101475 (test for warnings, l=
ine
63)
XFAIL->XPASS: gcc.dg/Wstringop-overflow-68.c pr101475 (test for warnings, l=
ine
64)

One new FAIL spotted:
PASS->FAIL: gcc.dg/guality/pr54693-2.c   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  -DPREVENT_OPTIMIZATION line 21 x =3D=3D 10 - i

which is from guality, not sure whether we want to recover the original
behavior since there are already some existing FAILs before. The reason why=
 it
fails is that O2 loop vect enables dce6 which takes x in PHI useless and re=
move
it, further stops to reuse i for x's debug information.=