https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79564
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Component|c++ |tree-optimization
Severity|normal |enhancement
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
On aarch64-linux-gnu (with -mcpu=thunderx+lse) we get:
.L3:
mov w2, 1
ldadd w2, w2, [x1]
ldrb w2, [x0], 1
cbnz w2, .L3
.L2:
add x3, x3, :lo12:.LANCHOR0
ldar w0, [x3]
ldadd is the atomic relaxed fetch and add.
So we don't compile exactly the same as seq_cst but still not as optimized as
you want.
Note GCC does not do any optimization on atomics yet.
