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raw_ostream: [PR6745] Tweak formatting (double)%e for Windows hosts.

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On MSVCRT and compatible, output of %e is incompatible to Posix by default. Number of exponent digits should be at least 2. "%+03d"

FIXME: Implement our formatter in future!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127872 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
NAKAMURA Takumi 2011-03-18 09:30:10 +00:00
parent f09a8b533d
commit d4f4e6ee2c
2 changed files with 30 additions and 1 deletions
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30
lib/Support/raw_ostream.cpp
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@ -220,6 +220,36 @@ raw_ostream &raw_ostream::operator<<(const void *P) {
}
raw_ostream &raw_ostream::operator<<(double N) {
#ifdef _WIN32
// On MSVCRT and compatible, output of %e is incompatible to Posix
// by default. Number of exponent digits should be at least 2. "%+03d"
// FIXME: Implement our formatter to here or Support/Format.h!
int fpcl = _fpclass(N);
// negative zero
if (fpcl == _FPCLASS_NZ)
return *this << "-0.000000e+00";
char buf[16];
unsigned len;
len = snprintf(buf, sizeof(buf), "%e", N);
if (len <= sizeof(buf) - 2) {
if (len >= 5 && buf[len - 5] == 'e' && buf[len - 3] == '0') {
int cs = buf[len - 4];
if (cs == '+' || cs == '-') {
int c1 = buf[len - 2];
int c0 = buf[len - 1];
if (isdigit(c1) && isdigit(c0)) {
// Trim leading '0': "...e+012" -> "...e+12\0"
buf[len - 3] = c1;
buf[len - 2] = c0;
buf[--len] = 0;
}
}
}
return this->operator<<(buf);
}
#endif
return this->operator<<(format("%e", N));
}

1
utils/lit/lit/TestingConfig.py
View File

@ -17,7 +17,6 @@ class TestingConfig:
'PATHEXT' : os.environ.get('PATHEXT',''),
'SYSTEMROOT' : os.environ.get('SYSTEMROOT',''),
'LLVM_DISABLE_CRT_DEBUG' : '1',
'PRINTF_EXPONENT_DIGITS' : '2',
'PYTHONUNBUFFERED' : '1',
}