[Bug rtl-optimization/113951] regression redundant load

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113951

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
          Component|target                      |rtl-optimization
             Target|                            |x86_64-*-*
   Last reconfirmed|                            |2024-02-16

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  There's no CSE between sched1 and RA and while GCSE after RA sees
both loads:

expr: (mem/f/c:DI (symbol_ref:DI ("g_677") [flags 0x2]  <var_decl
0x7ffff6a19ea0 g_677>) [3 g_677+0 S8 A64])
hashcode: 2958100634
list of occurrences:
(insn 19 16 57 5 (set (reg/f:DI 0 ax [orig:104 pretmp_21 ] [104])
        (mem/f/c:DI (symbol_ref:DI ("g_677") [flags 0x2]  <var_decl
0x7ffff6a19ea0 g_677>) [3 g_677+0 S8 A64])) "t.c":46:3 84 {*movdi_internal}
     (nil))

(insn 9 8 52 3 (set (reg/f:DI 0 ax [orig:104 pretmp_21 ] [104])
        (mem/f/c:DI (symbol_ref:DI ("g_677") [flags 0x2]  <var_decl
0x7ffff6a19ea0 g_677>) [3 g_677+0 S8 A64])) "t.c":46:3 84 {*movdi_internal}
     (nil))

it doesn't do anything here.