18.03.21 03:39, Victor Stinner пише:
> I'm happy to see that Python 3.10 now also implements faster bytecode
> which rely on this change ;-)
It was used long time ago before 3.10. For example:
a[i] = \
f()
2 0 LOAD_NAME0 (f)
2 CALL_FUNCTION
Hi Skip,
I modified co_lnotab format when I worked on the FAT Python
optimization project which modified the AST to emit more efficient
bytecode. My optimizer moved instructions, the line number could
become non-monotonic (..., line 2, line 3, line 2, line 4, ...), and
so lnotab (..., +1, -1, +2,
> co_lnotab has had negative deltas since 3.6.
Thanks. I'm probably misreading Objects/lnotab_notes.txt.
Skip
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On 3/17/21 6:41 PM, MRAB wrote:
On 2021-03-17 22:10, Skip Montanaro wrote:
I stumbled on this while trying to generate a line number table in my
side project register VM. As I understand it, the line number delta
in the output table is supposed to always be >= 0. In my code I'm
using
On 2021-03-17 22:10, Skip Montanaro wrote:
Consider this little session from the tip of the spear:
>>> sys.version
'3.10.0a6+ (heads/master:0ab152c6b5, Mar 15 2021, 17:24:38) [GCC 10.2.0]'
>>> def while2(a):
... while a >= 0:
... a -= 1
... return a
...
>>> dis.dis(while2)
