https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89921
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Summary|The dom pass does not |The jump threading
|respect size of an 'asm' |increases the size a lot
|when duplicating BBs |when having an huge
| |inline-asm
Severity|normal |enhancement
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
tree-ssa-threadupdate.c only deletes the threaded jumps when optimizing for
size:
/* When optimizing for size, prune all thread paths where statement
duplication is necessary.
We walk the jump thread path looking for copied blocks. There's
two types of copied blocks.
EDGE_COPY_SRC_JOINER_BLOCK is always copied and thus we will
cancel the jump threading request when optimizing for size.
EDGE_COPY_SRC_BLOCK which is copied, but some of its statements
will be killed by threading. If threading does not kill all of
its statements, then we should cancel the jump threading request
when optimizing for size. */
I think there was a discussion about this similar thing on the mailing list
before.
