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ctype_members.cc (do_is(mask, wchar_t)): Speed-up for the common case of mask == ctype_base::space...

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2005-07-18  Paolo Carlini  <pcarlini@suse.de>

	* config/locale/gnu/ctype_members.cc (do_is(mask, wchar_t)):
	Speed-up for the common case of mask == ctype_base::space;
	otherwise, exit the loop earlier if the mask is one of the
	elementary ones.

From-SVN: r102137
This commit is contained in:
Paolo Carlini 2005-07-18 17:42:32 +00:00 committed by Paolo Carlini
parent eba839f971
commit 39a72a9179
2 changed files with 32 additions and 11 deletions
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7
libstdc++-v3/ChangeLog
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@ -1,3 +1,10 @@
2005-07-18 Paolo Carlini <pcarlini@suse.de>
* config/locale/gnu/ctype_members.cc (do_is(mask, wchar_t)):
Speed-up for the common case of mask == ctype_base::space;
otherwise, exit the loop earlier if the mask is one of the
elementary ones.
2005-07-14 Paolo Carlini <pcarlini@suse.de>
PR libstdc++/21193 (float, double, long double)

36
libstdc++-v3/config/locale/gnu/ctype_members.cc
View File

@ -134,20 +134,34 @@ namespace std
ctype<wchar_t>::
do_is(mask __m, wchar_t __c) const
{
// Highest bitmask in ctype_base == 10, but extra in "C"
// library for blank.
// The case of __m == ctype_base::space is particularly important,
// due to its use in many istream functions. Therefore we deal with
// it first, exploiting the knowledge that on GNU systems _M_bit[5]
// is the mask corresponding to ctype_base::space. NB: an encoding
// change would not affect correctness!
bool __ret = false;
const size_t __bitmasksize = 11;
for (size_t __bitcur = 0; __bitcur <= __bitmasksize; ++__bitcur)
if (__m & _M_bit[__bitcur]
&& __iswctype_l(__c, _M_wmask[__bitcur], _M_c_locale_ctype))
{
__ret = true;
break;
}
if (__m == _M_bit[5])
__ret = __iswctype_l(__c, _M_wmask[5], _M_c_locale_ctype);
else
{
// Highest bitmask in ctype_base == 10, but extra in "C"
// library for blank.
const size_t __bitmasksize = 11;
for (size_t __bitcur = 0; __bitcur <= __bitmasksize; ++__bitcur)
if (__m & _M_bit[__bitcur])
{
if (__iswctype_l(__c, _M_wmask[__bitcur], _M_c_locale_ctype))
{
__ret = true;
break;
}
else if (__m == _M_bit[__bitcur])
break;
}
}
return __ret;
}
const wchar_t*
ctype<wchar_t>::
do_is(const wchar_t* __lo, const wchar_t* __hi, mask* __vec) const