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* [Bug tree-optimization/109843] New: signbit comparisons -> copysign optimization
@ 2023-05-13 16:45 pinskia at gcc dot gnu.org
2023-11-09 4:24 ` [Bug tree-optimization/109843] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-05-13 16:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109843
Bug ID: 109843
Summary: signbit comparisons -> copysign optimization
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Target Milestone: ---
float copysign1(float x, float y)
{
bool t = __builtin_signbit(x) == 0;
bool t1 = __builtin_signbit(y) == 0;
return (t == t1) ? y : -y;
}
float copysign2(float x, float y)
{
bool t = __builtin_signbit(x) != 0;
bool t1 = __builtin_signbit(y) != 0;
return (t == t1) ? y : -y;
}
float copysign3(float x, float y)
{
bool t = __builtin_signbit(x) != 0;
bool t1 = __builtin_signbit(y) == 0;
return (t != t1) ? y : -y;
}
float copysign4(float x, float y)
{
bool t = __builtin_signbit(x) == 0;
bool t1 = __builtin_signbit(y) != 0;
return (t != t1) ? y : -y;
}
float copysign5(float x, float y)
{
return __builtin_copysignf(x, y);
}
These all should end up being the same code.
Hopefully I didn't mess these up.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/109843] signbit comparisons -> copysign optimization
2023-05-13 16:45 [Bug tree-optimization/109843] New: signbit comparisons -> copysign optimization pinskia at gcc dot gnu.org
@ 2023-11-09 4:24 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-11-09 4:24 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109843
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |pinskia at gcc dot gnu.org
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2023-11-09
Ever confirmed|0 |1
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Mine.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2023-05-13 16:45 [Bug tree-optimization/109843] New: signbit comparisons -> copysign optimization pinskia at gcc dot gnu.org
2023-11-09 4:24 ` [Bug tree-optimization/109843] " pinskia at gcc dot gnu.org
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