Add support for letting the client choose different flavors of NaNs. Testcase to be
added in clang.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72606 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/APFloat.cpp b/lib/Support/APFloat.cpp
index 4c79ba6..3b03c54 100644
--- a/lib/Support/APFloat.cpp
+++ b/lib/Support/APFloat.cpp
@@ -598,12 +598,18 @@
/* Make this number a NaN, with an arbitrary but deterministic value
for the significand. If double or longer, this is a signalling NaN,
- which may not be ideal. */
+ which may not be ideal. If float, this is QNaN(0). */
void
-APFloat::makeNaN(void)
+APFloat::makeNaN(unsigned type)
{
category = fcNaN;
- APInt::tcSet(significandParts(), ~0U, partCount());
+ // FIXME: Add double and long double support for QNaN(0).
+ if (semantics->precision == 24 && semantics->maxExponent == 127) {
+ type |= 0x7fc00000U;
+ type &= ~0x80000000U;
+ } else
+ type = ~0U;
+ APInt::tcSet(significandParts(), type, partCount());
}
APFloat &
@@ -662,16 +668,16 @@
}
APFloat::APFloat(const fltSemantics &ourSemantics,
- fltCategory ourCategory, bool negative)
+ fltCategory ourCategory, bool negative, unsigned type)
{
assertArithmeticOK(ourSemantics);
initialize(&ourSemantics);
category = ourCategory;
sign = negative;
- if(category == fcNormal)
+ if (category == fcNormal)
category = fcZero;
else if (ourCategory == fcNaN)
- makeNaN();
+ makeNaN(type);
}
APFloat::APFloat(const fltSemantics &ourSemantics, const char *text)