Re: mbcel module for Gnulib?

[Bruno Haible]

I wrote:
> So, clearly, the struct-as-return-value approach nowadays generates
> more efficient code than when mbiter was designed (in 2001-2005).
> 
> I will thus create new variants of mbiter, mbuiter, called mbitern, mbuitern
> ('n' for "new"), that allow better optimization by current GCC.

I've called these variants 'mbiterf' and 'mbuiterf'. The benchmarks
now show decent performance for ASCII text (tests a and b):

$ ./gnulib-tool --create-testdir --dir=../testdir1 --single-configure --symlink 
mbuiterf-bench-tests mbiterf-bench-tests mbrtoc32-regular
$ cd ../testdir1
$ patch -p1 < .../y.diff

    mbiterf mbcel   mbuiterf
a    0.226  0.220    0.206
b    0.231  0.221    0.205
c    1.145  0.670    1.179
d    0.850  0.715    0.882
e    0.894  0.720    0.939
f   13.028  5.714   14.654
g    8.855  6.694    9.601
h    8.618  6.596   10.072
i    3.955  2.828    4.631
j    4.169  3.027    4.756

Thanks Paul for the insights!

Bruno