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From: "martin at martin dot st" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/103274] Remaining -freorder-blocks-and-partition/ glitch
 with Windows SEH
Date: Tue, 16 Nov 2021 16:07:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103274

--- Comment #4 from Martin Storsj=C3=B6 <martin at martin dot st> ---
Also for additional context; with GCC 9.x, this testcase had the needed nop
instruction between "call" and ".seh_endproc".

In GCC 10.x (regressed in
https://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dcommitdiff;h=3D095f78c62157124ad47=
9a3f98b6995ced090b807),
-freorder-blocks-and-partition applies on this function and it gets split i=
nto
a hot and cold part, and the needed "nop" instruction disappeared.

If building with -fno-reorder-blocks-and-partition, the issue disappears and
you get roughly the same output as in GCC 9.x

This seems like the same issue as was fixed in
https://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dcommitdiff;h=3D15278fb2877184c75a6=
ee3a6def09efbb191968b;hp=3D9d3b9a3e70e634c7c48bb12bb35ec8219024f98b
- but that fix doesn't seem to help here, as builds of GCC that include that
commit still are missing the nop between "call" and ".seh_endproc".=