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* [Bug target/98698] New: atomic load to FPU registers
@ 2021-01-15 14:47 glisse at gcc dot gnu.org
2021-12-15 1:13 ` [Bug target/98698] " pinskia at gcc dot gnu.org
2021-12-15 1:13 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: glisse at gcc dot gnu.org @ 2021-01-15 14:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98698
Bug ID: 98698
Summary: atomic load to FPU registers
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: glisse at gcc dot gnu.org
Target Milestone: ---
Target: x86_64-*-*
#include <atomic>
std::atomic<double> a;
double f(){ return a.load(std::memory_order_relaxed); }
is compiled by g++ to
movq a(%rip), %rax
movq %rax, %xmm0
ret
As far as I understand, a direct movsd to xmm0 would still be atomic, and
that's indeed what llvm outputs.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/98698] atomic load to FPU registers
2021-01-15 14:47 [Bug target/98698] New: atomic load to FPU registers glisse at gcc dot gnu.org
@ 2021-12-15 1:13 ` pinskia at gcc dot gnu.org
2021-12-15 1:13 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-12-15 1:13 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98698
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Only LLVM does this optimization while ICC and MSVC don't either.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/98698] atomic load to FPU registers
2021-01-15 14:47 [Bug target/98698] New: atomic load to FPU registers glisse at gcc dot gnu.org
2021-12-15 1:13 ` [Bug target/98698] " pinskia at gcc dot gnu.org
@ 2021-12-15 1:13 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-12-15 1:13 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98698
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2021-12-15
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-01-15 14:47 [Bug target/98698] New: atomic load to FPU registers glisse at gcc dot gnu.org
2021-12-15 1:13 ` [Bug target/98698] " pinskia at gcc dot gnu.org
2021-12-15 1:13 ` pinskia at gcc dot gnu.org
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