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From: "roger at nextmovesoftware dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/101642] [12 Regression] ice in decompose, at
 wide-int.h:984
Date: Tue, 27 Jul 2021 15:08:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101642

Roger Sayle <roger at nextmovesoftware dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |roger at nextmovesoftware =
dot com

--- Comment #11 from Roger Sayle <roger at nextmovesoftware dot com> ---
Hi Jakub,
Sorry for the inconvenience.
I've just come up with a near-identical fix.  I think it's safe to strip the
(symmetric) bswaps in the first transformation, but I'm now paranoid enough=
 to
explicitly convert both operands of the cmp to the same comparison type in =
the
second transformation.
-   (cmp (bswap @0) INTEGER_CST@1)
-   (cmp @0 (bswap @1))))
+   (cmp (bswap@0 @1) INTEGER_CST@2)
+   (with { tree t =3D TREE_TYPE(@0); }
+    (cmp (convert:t @1) (convert:t (bswap @2))))))=