https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127693
--- Comment #25 from Thiago Macieira <thiago at kde dot org> ---
AI came up with a different testcase still producing problems:
#include <QtCore/qbitarray.h>
#include <QtCore/qstringview.h>
#include <cstdio>
// Reduced from NumericPattern::Scanner in
qtbase/src/corelib/time/qtimezoneprivate.cpp
struct Scanner
{
QStringView given;
QBitArray mask;
explicit Scanner(QStringView t) : given(t), mask(t.size()) {}
bool scanForToken(QStringView sought)
{
const qsizetype n = sought.size();
qsizetype idx = -n;
qsizetype tokensMatched = 0;
while ((idx = given.indexOf(sought, idx + n)) >= 0) {
for (qsizetype i = 0; i < n; ++i)
mask.setBit(idx + i);
++tokensMatched;
}
return tokensMatched > 0;
}
Q_NEVER_INLINE bool scanForSigns()
{
return scanForToken(u"\u2212"); // Canonical minus sign
}
};
int main()
{
Scanner s(u"1\u22122-3");
std::printf("%d\n", s.scanForSigns()); // expected: 1
}
Assembly is still:
_ZN7Scanner12scanForSignsEv:
.LFB7754:
.cfi_startproc
ud2
.cfi_endproc
