[X86][Haswell][SchedModel] Add architecture specific scheduling models.

[oota-llvm.git] / lib / Support / APFloat.cpp

diff --git a/lib/Support/APFloat.cpp b/lib/Support/APFloat.cpp
index f9fe09541dbe22c73eeafaab9441052863740f9f..7989e30afae62d4cdbf4b4f552b648387f78448e 100644 (file)
--- a/lib/Support/APFloat.cpp
+++ b/lib/Support/APFloat.cpp
@@ -1372,7 +1372,9 @@ APFloat::addOrSubtractSpecials(const APFloat &rhs, bool subtract)
   case PackCategoriesIntoKey(fcZero, fcNaN):
   case PackCategoriesIntoKey(fcNormal, fcNaN):
   case PackCategoriesIntoKey(fcInfinity, fcNaN):
-    sign = false;
+    // We need to be sure to flip the sign here for subtraction because we
+    // don't have a separate negate operation so -NaN becomes 0 - NaN here.
+    sign = rhs.sign ^ subtract;
     category = fcNaN;
     copySignificand(rhs);
     return opOK;