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author | Linus Torvalds <torvalds@linux-foundation.org> | 2024-07-29 06:24:12 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2024-07-29 06:24:12 +0300 |
commit | dc1c8034e31b14a2e5e212104ec508aec44ce1b9 (patch) | |
tree | 64dded44727b68ac11ae8951597b3cb7d5a2a736 /drivers/char/ip2 | |
parent | cb04e8b1d2f24c4c2c92f7b7529031fc35a16fed (diff) | |
download | linux-dc1c8034e31b14a2e5e212104ec508aec44ce1b9.tar.xz |
minmax: simplify min()/max()/clamp() implementation
Now that we no longer have any C constant expression contexts (ie array
size declarations or static initializers) that use min() or max(), we
can simpify the implementation by not having to worry about the result
staying as a C constant expression.
So now we can unconditionally just use temporary variables of the right
type, and get rid of the excessive expansion that used to come from the
use of
__builtin_choose_expr(__is_constexpr(...), ..
to pick the specialized code for constant expressions.
Another expansion simplification is to pass the temporary variables (in
addition to the original expression) to our __types_ok() macro. That
may superficially look like it complicates the macro, but when we only
want the type of the expression, expanding the temporary variable names
is much simpler and smaller than expanding the potentially complicated
original expression.
As a result, on my machine, doing a
$ time make drivers/staging/media/atomisp/pci/isp/kernels/ynr/ynr_1.0/ia_css_ynr.host.i
goes from
real 0m16.621s
user 0m15.360s
sys 0m1.221s
to
real 0m2.532s
user 0m2.091s
sys 0m0.452s
because the token expansion goes down dramatically.
In particular, the longest line expansion (which was line 71 of that
'ia_css_ynr.host.c' file) shrinks from 23,338kB (yes, 23MB for one
single line) to "just" 1,444kB (now "only" 1.4MB).
And yes, that line is still the line from hell, because it's doing
multiple levels of "min()/max()" expansion thanks to some of them being
hidden inside the uDIGIT_FITTING() macro.
Lorenzo has a nice cleanup patch that makes that driver use inline
functions instead of macros for sDIGIT_FITTING() and uDIGIT_FITTING(),
which will fix that line once and for all, but the 16-fold reduction in
this case does show why we need to simplify these helpers.
Cc: David Laight <David.Laight@aculab.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/ip2')
0 files changed, 0 insertions, 0 deletions