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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/97756] [9/10/11/12 Regression] Inefficient
 handling of 128-bit arguments
Date: Wed, 28 Apr 2021 07:20:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97756

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|enhancement                 |normal
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |vmakarov at gcc dot gnu.org
            Summary|Inefficient handling of     |[9/10/11/12 Regression]
                   |128-bit arguments           |Inefficient handling of
                   |                            |128-bit arguments
   Last reconfirmed|                            |2021-04-28
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
           Priority|P3                          |P2
   Target Milestone|---                         |9.4

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
On the
__uint128_t f(__uint128_t x, __uint128_t y) { return x + y; }
__uint128_t g(__uint128_t x, __uint128_t y) { return y + x; }
testcase with -O2 this regressed with
r9-6788-g0d2a576a1417b8d4526d369fef1d87cee2c49f99=