diff options
Diffstat (limited to 'lib/Support/APFloat.cpp')
| -rw-r--r-- | lib/Support/APFloat.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Support/APFloat.cpp b/lib/Support/APFloat.cpp index 686f91b087..5b68fbb270 100644 --- a/lib/Support/APFloat.cpp +++ b/lib/Support/APFloat.cpp @@ -1913,6 +1913,12 @@ APFloat::convert(const fltSemantics &toSemantics, *losesInfo = (fs != opOK); } else if (category == fcNaN) { *losesInfo = lostFraction != lfExactlyZero || X86SpecialNan; + + // For x87 extended precision, we want to make a NaN, not a special NaN if + // the input wasn't special either. + if (!X86SpecialNan && semantics == &APFloat::x87DoubleExtended) + APInt::tcSetBit(significandParts(), semantics->precision - 1); + // gcc forces the Quiet bit on, which means (float)(double)(float_sNan) // does not give you back the same bits. This is dubious, and we // don't currently do it. You're really supposed to get |