[Bug rtl-optimization/93402] [8/9/10 Regression] Wrong code when returning padded struct

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93402

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
-(insn 14 13 23 2 (parallel [
-            (set (reg:DI 1 dx [94])
-                (plus:DI (reg:DI 1 dx [95])
-                    (reg:DI 5 di [92])))
-            (clobber (reg:CC 17 flags))
-        ]) "pr93402.c":8:30 186 {*adddi_1}
-     (expr_list:REG_EQUAL (plus:DI (reg:DI 5 di [92])
-            (const_int 111111111111 [0x19debd01c7]))
-        (nil)))
-(insn 23 14 25 2 (set (reg:SI 0 ax)
+(insn 23 13 25 2 (set (reg:SI 0 ax)
         (const_int 0 [0])) "pr93402.c":10:1 67 {*movsi_internal}
      (nil))
 (insn 25 23 26 2 (use (reg:SI 0 ax)) "pr93402.c":10:1 -1
      (nil))
-(insn 26 25 35 2 (use (reg:DI 1 dx)) "pr93402.c":10:1 -1
+(insn 26 25 35 2 (use (plus:DI (reg:DI 1 dx [95])
+            (reg:DI 5 di [92]))) "pr93402.c":10:1 -1
      (nil))

Ugh, turning a use of a reg into use of addition...