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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/94541] [8/9/10 Regression] -mx32 gcc produces wrong
 code passing structs by value
Date: Thu, 09 Apr 2020 20:42:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94541

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|target                      |middle-end

--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
After 284r.ira:

(insn 12 11 13 3 (parallel [
            (set (reg:DI 88)
                (lshiftrt:DI (reg/v:DI 85 [ b ])
                    (const_int 32 [0x20])))
            (clobber (reg:CC 17 flags))
        ]) "y.i":14:14 639 {*lshrdi3_1}
     (expr_list:REG_UNUSED (reg:CC 17 flags)
        (nil)))
(insn 13 12 14 3 (set (reg:SI 4 si)
        (subreg:SI (reg/v:DI 85 [ b ]) 0)) "y.i":14:14 67 {*movsi_internal}
     (expr_list:REG_DEAD (reg/v:DI 85 [ b ])
        (nil)))
(insn 14 13 15 3 (set (reg:DI 5 di)
        (reg:DI 88)) "y.i":14:14 66 {*movdi_internal}
     (expr_list:REG_DEAD (reg:DI 88)
        (nil)))

After 285r.reload:

(insn 32 11 12 3 (set (reg:DI 5 di [88])
        (reg/v:DI 4 si [orig:85 b ] [85])) "y.i":14:14 66 {*movdi_internal}
     (nil))
(insn 12 32 15 3 (parallel [
            (set (reg:DI 5 di [88])
                (lshiftrt:DI (reg:DI 5 di [88])
                    (const_int 32 [0x20])))
            (clobber (reg:CC 17 flags))
        ]) "y.i":14:14 639 {*lshrdi3_1}
     (nil))=