Fix a bug that APFloat::fusedMultiplyAdd() mistakenly evaluate "14.5f * -14.5f + 225.0f" to 225.0f.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181715 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/ADT/APFloatTest.cpp b/unittests/ADT/APFloatTest.cpp
index 2789835..099f6db 100644
--- a/unittests/ADT/APFloatTest.cpp
+++ b/unittests/ADT/APFloatTest.cpp
@@ -33,6 +33,29 @@
namespace {
+TEST(APFloatTest, FMA) {
+ APFloat::roundingMode rdmd = APFloat::rmNearestTiesToEven;
+
+ {
+ APFloat f1(14.5f);
+ APFloat f2(-14.5f);
+ APFloat f3(225.0f);
+ f1.fusedMultiplyAdd(f2, f3, APFloat::rmNearestTiesToEven);
+ EXPECT_EQ(14.75f, f1.convertToFloat());
+ }
+
+ {
+ APFloat Val2(2.0f);
+ APFloat f1((float)1.17549435e-38F);
+ APFloat f2((float)1.17549435e-38F);
+ f1.divide(Val2, rdmd);
+ f2.divide(Val2, rdmd);
+ APFloat f3(12.0f);
+ f1.fusedMultiplyAdd(f2, f3, APFloat::rmNearestTiesToEven);
+ EXPECT_EQ(12.0f, f1.convertToFloat());
+ }
+}
+
TEST(APFloatTest, Denormal) {
APFloat::roundingMode rdmd = APFloat::rmNearestTiesToEven;