On Sun, Jan 29, 2017 at 06:08:32PM +0530, Prathamesh Kulkarni wrote:
> > + <li>A new interprocedural bitwise constant propagation optimization
> > + has been added, which propagates knowledge about which bits of variables
> > + are known to be zero (including pointer alignment information) across
> > + the call graph. It can be enabled by using the <code>-fipa-bit-cp</code>
> > + option if <code>-fipa-cp</code> is enabled as well, and is enabled by
> > + default at the <code>-O2</code> optimization level and higher.</li>
> Hi,
> Just a small comment: -fipa-bit-cp makes -fipa-cp-alignment deprecated.
I've committed it as is, feel free to propose changes. But before that, we
should figure out what to do with -fipa-cp-alignment. Should it have
Ignore flag and
Does nothing. Preserved for backward compatibility.
description in common.opt, and
@item -fipa-cp-alignment
@opindex -fipa-cp-alignment
When enabled, this optimization propagates alignment of function
parameters to support better vectorization and string operations.
This flag is enabled by default at @option{-O2} and @option{-Os}. It
requires that @option{-fipa-cp} is enabled.
@option{-fipa-cp-alignment} is obsolete, use @option{-fipa-bit-cp} instead.
removed altogether, or should it say be alias for -fipa-bit-cp?
The documentation certainly doesn't document what it does, because nothing
ever looks at that flag, so it is effectively ignored, not just obsolete.
Jakub
