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* [Bug target/82883] eax register unnecessary consumed
       [not found] <bug-82883-4@http.gcc.gnu.org/bugzilla/>
@ 2021-08-15 10:55 ` pinskia at gcc dot gnu.org
  2021-08-15 13:43 ` hjl.tools at gmail dot com
  1 sibling, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-08-15 10:55 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82883

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
With -mtune=intel -O3, we produce:

        movl    $1819043144, (%rdi)
        movw    $8303, 4(%rdi)
        ret

So it looks like a target tuning issue.

^ permalink raw reply	[flat|nested] 2+ messages in thread
* [Bug target/82883] eax register unnecessary consumed
       [not found] <bug-82883-4@http.gcc.gnu.org/bugzilla/>
  2021-08-15 10:55 ` [Bug target/82883] eax register unnecessary consumed pinskia at gcc dot gnu.org
@ 2021-08-15 13:43 ` hjl.tools at gmail dot com
  1 sibling, 0 replies; 2+ messages in thread
From: hjl.tools at gmail dot com @ 2021-08-15 13:43 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82883

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

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

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
It is done on purpose by r0-116075:

[hjl@gnu-cfl-2 tmp]$ gcc -S -O2 x.c -mtune-ctrl=^lcp_stall
[hjl@gnu-cfl-2 tmp]$ cat x.s
        .file   "x.c"
        .text
        .p2align 4
        .globl  foo
        .type   foo, @function
foo:
.LFB0:
        .cfi_startproc
        movl    $1819043144, (%rdi)
        movw    $8303, 4(%rdi)
        ret
        .cfi_endproc
.LFE0:
        .size   foo, .-foo
        .ident  "GCC: (GNU) 11.2.1 20210728 (Red Hat 11.2.1-1)"
        .section        .note.GNU-stack,"",@progbits
[hjl@gnu-cfl-2 tmp]$

^ permalink raw reply	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2021-08-15 13:43 UTC | newest]

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     [not found] <bug-82883-4@http.gcc.gnu.org/bugzilla/>
2021-08-15 10:55 ` [Bug target/82883] eax register unnecessary consumed pinskia at gcc dot gnu.org
2021-08-15 13:43 ` hjl.tools at gmail dot com

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