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* [Bug middle-end/109844] New: Unnecessary basic block with single jmp instruction
@ 2023-05-13 17:43 chfast at gmail dot com
  2023-05-13 17:51 ` [Bug target/109844] " pinskia at gcc dot gnu.org
  0 siblings, 1 reply; 2+ messages in thread
From: chfast at gmail dot com @ 2023-05-13 17:43 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109844

            Bug ID: 109844
           Summary: Unnecessary basic block with single jmp instruction
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chfast at gmail dot com
  Target Milestone: ---

The code

void err(void);

void merge_bb(int y) {
    if (y) 
        return err();
}

is

merge_bb:
        test    edi, edi
        jne     .L4
        ret
.L4:
        jmp     err


but could be

merge_bb:
        test    edi, edi
        jne     err
        ret

https://godbolt.org/z/eafPa4o4T

^ permalink raw reply	[flat|nested] 2+ messages in thread
* [Bug target/109844] Unnecessary basic block with single jmp instruction
  2023-05-13 17:43 [Bug middle-end/109844] New: Unnecessary basic block with single jmp instruction chfast at gmail dot com
@ 2023-05-13 17:51 ` pinskia at gcc dot gnu.org
  0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-05-13 17:51 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109844

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |DUPLICATE
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of much older issue, PR 47253.

*** This bug has been marked as a duplicate of bug 47253 ***

^ permalink raw reply	[flat|nested] 2+ messages in thread
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2023-05-13 17:43 [Bug middle-end/109844] New: Unnecessary basic block with single jmp instruction chfast at gmail dot com
2023-05-13 17:51 ` [Bug target/109844] " pinskia at gcc dot gnu.org

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