[Development] QtCore is 2 MB larger in Qt 5
vivo75 at gmail.com
vivo75 at gmail.com
Fri Jul 13 13:34:32 CEST 2012
> It was on linkonce sections. The attached script improves on it.
>
> Unfortunately, those sections are unpredictable, since they depend on the
> compiler's mood in inlining or not inlining some things. For example, QList is
> mostly unchanged in Qt 5, but this shows up:
>
you may want to experiment a bit with `gcc --pram=large-function-growth=X`
that can change the mood of gcc quite a bit.
This message has no opinion or intention in this topic other than let
know this parameters exist and can be used for experimetation.
gcc --help=param
[...]
max-inline-insns-single The maximum number of instructions in a
single
function eligible for inlining
max-inline-insns-auto The maximum number of instructions when
automatically inlining
max-inline-insns-recursive The maximum number of instructions inline
function can grow to via recursive inlining
max-inline-insns-recursive-auto The maximum number of instructions
non-inline
function can grow to via recursive inlining
max-inline-recursive-depth The maximum depth of recursive inlining for
inline functions
max-inline-recursive-depth-auto The maximum depth of recursive
inlining for
non-inline functions
min-inline-recursive-probability Inline recursively only when the
probability
of call being executed exceeds the parameter
max-early-inliner-iterations The maximum number of nested indirect
inlining
performed by early inliner
comdat-sharing-probability Probability that COMDAT function will be
shared
with different compilatoin unit
partial-inlining-entry-probability Maximum probability of the entry BB of
split region (in percent relative to
entry BB of
the function) to make partial inlining happen
max-variable-expansions-in-unroller If
-fvariable-expansion-in-unroller is
used, the maximum number of times that an
individual variable will be expanded
during loop
unrolling
[...]
inline-unit-growth How much can given compilation unit grow
because
of the inlining (in percent)
ipcp-unit-growth How much can given compilation unit grow
because
of the interprocedural constant
propagation (in
percent)
early-inlining-insns Maximal estimated growth of function body
caused
by early inlining of single call
large-stack-frame The size of stack frame to be considered
large
large-stack-frame-growth Maximal stack frame growth due to
inlining (in
percent)
[...]
More information about the Development
mailing list