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* [Bug target/87206] Suboptimal code generation for __atomic_compare_exchange_n followed by a comparison
[not found] <bug-87206-4@http.gcc.gnu.org/bugzilla/>
@ 2021-12-21 11:28 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; only message in thread
From: pinskia at gcc dot gnu.org @ 2021-12-21 11:28 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87206
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
Last reconfirmed| |2021-12-21
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
Note GCC does produce better code than LLVM which produces two branches:
mov ecx, 1
xor eax, eax
lock cmpxchg dword ptr [rdi], ecx
je .LBB0_2
# %bb.1:
test eax, eax
je .LBB0_2
# %bb.3:
jmp bar # TAILCALL
.LBB0_2:
ret
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[not found] <bug-87206-4@http.gcc.gnu.org/bugzilla/>
2021-12-21 11:28 ` [Bug target/87206] Suboptimal code generation for __atomic_compare_exchange_n followed by a comparison pinskia at gcc dot gnu.org
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