[Bug target/52034] __builtin_copysign optimization suboptimal

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52034

Andrew Pinski  changed:

   What|Removed |Added

   Target Milestone|--- |11.0
 Resolution|--- |FIXED
 Status|NEW |RESOLVED

--- Comment #6 from Andrew Pinski  ---
This was a scrach_register issue which was fixed in r11-4577.

[Bug target/52034] __builtin_copysign optimization suboptimal

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52034

--- Comment #5 from Andrew Pinski  ---
Th

[Bug target/52034] __builtin_copysign optimization suboptimal

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52034

Andrew Pinski  changed:

   What|Removed |Added

   See Also||https://gcc.gnu.org/bugzill
   ||a/show_bug.cgi?id=89984
   Severity|normal  |enhancement

--- Comment #4 from Andrew Pinski  ---
related to PR 89984.

[Bug target/52034] __builtin_copysign optimization suboptimal

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52034

Marc Glisse  changed:

   What|Removed |Added

   Last reconfirmed|2012-01-29 00:00:00 |2018-8-30
  Known to fail||8.2.0

--- Comment #3 from Marc Glisse  ---
I don't understand why we keep UNSPEC_COPYSIGN so long, it is only expanded in
split2, after register allocation. Maybe splitting earlier into and+and+or
would help RA...

[Bug target/52034] __builtin_copysign optimization suboptimal

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52034

--- Comment #2 from Richard Guenther rguenth at gcc dot gnu.org 2012-01-30 
09:35:37 UTC ---
It's an RA issue I think - the RA isn't very clever when it comes to
coalescing pseudos with incoming or outgoing fixed regs.

[Bug target/52034] __builtin_copysign optimization suboptimal

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52034

Andrew Pinski pinskia at gcc dot gnu.org changed:

   What|Removed |Added

 Target||x86_64-*-* i?86-*-*
 Status|UNCONFIRMED |NEW
   Keywords||missed-optimization, ra
   Last reconfirmed||2012-01-29
  Component|tree-optimization   |target
 Ever Confirmed|0   |1

--- Comment #1 from Andrew Pinski pinskia at gcc dot gnu.org 2012-01-29 
01:27:53 UTC ---
Confirmed.  This is either the way copysign rtl is done on x86_64 or is a
register allocator issue with the copysign rtl.