[llvm] APFloat: Add minimumnum and maximumnum (PR #96304)

[Matt Arsenault via llvm-commits]

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@@ -631,6 +631,54 @@ TEST(APFloatTest, Maximum) {
   EXPECT_TRUE(std::isnan(maximum(nan, f1).convertToDouble()));
 }
 
+TEST(APFloatTest, MinimumNumber) {
+  APFloat f1(1.0);
+  APFloat f2(2.0);
+  APFloat zp(0.0);
+  APFloat zn(-0.0);
+  APFloat nan = APFloat::getNaN(APFloat::IEEEdouble());
+  APFloat snan = APFloat::getSNaN(APFloat::IEEEdouble());
+
+  EXPECT_EQ(1.0, minimumnum(f1, f2).convertToDouble());
+  EXPECT_EQ(1.0, minimumnum(f2, f1).convertToDouble());
+  EXPECT_EQ(-0.0, minimumnum(zp, zn).convertToDouble());
+  EXPECT_EQ(-0.0, minimumnum(zn, zp).convertToDouble());
+  EXPECT_TRUE(minimumnum(zn, zp).isNegative());
+  EXPECT_TRUE(minimumnum(zp, zn).isNegative());
+  EXPECT_TRUE(minimumnum(zn, zn).isNegative());
+  EXPECT_FALSE(minimumnum(zp, zp).isNegative());
+  EXPECT_FALSE(std::isnan(minimumnum(f1, nan).convertToDouble()));
+  EXPECT_FALSE(std::isnan(minimumnum(nan, f1).convertToDouble()));
+  EXPECT_FALSE(std::isnan(minimumnum(f1, snan).convertToDouble()));
+  EXPECT_FALSE(std::isnan(minimumnum(snan, f1).convertToDouble()));
+  EXPECT_FALSE(minimumnum(snan, nan).isSignaling());
+  EXPECT_FALSE(minimumnum(snan, snan).isSignaling());
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arsenm wrote:

Add some tests for nan payloads 

https://github.com/llvm/llvm-project/pull/96304