[clang] [llvm] [APFloat] Add APFloat support for FP6 data types (PR #94735)

[Matt Arsenault via cfe-commits]

================
@@ -1881,6 +1890,20 @@ TEST(APFloatTest, getSmallest) {
   EXPECT_TRUE(test.isFiniteNonZero());
   EXPECT_TRUE(test.isDenormal());
   EXPECT_TRUE(test.bitwiseIsEqual(expected));
+
+  test = APFloat::getSmallest(APFloat::Float6E3M2FN(), false);
+  expected = APFloat(APFloat::Float6E3M2FN(), "0x0.1p0");
+  EXPECT_FALSE(test.isNegative());
+  EXPECT_TRUE(test.isFiniteNonZero());
+  EXPECT_TRUE(test.isDenormal());
+  EXPECT_TRUE(test.bitwiseIsEqual(expected));
+
+  test = APFloat::getSmallest(APFloat::Float6E2M3FN(), false);
+  expected = APFloat(APFloat::Float6E2M3FN(), "0x0.2p0");
+  EXPECT_FALSE(test.isNegative());
+  EXPECT_TRUE(test.isFiniteNonZero());
+  EXPECT_TRUE(test.isDenormal());
+  EXPECT_TRUE(test.bitwiseIsEqual(expected));
 }
 
----------------
arsenm wrote:

Should also test getZero and the other special case constructors 

https://github.com/llvm/llvm-project/pull/94735
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