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

[Matt Arsenault via llvm-commits]

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@@ -631,6 +631,100 @@ 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);
+  APInt intPayload_89ab(64, 0x89ab);
+  APInt intPayload_cdef(64, 0xcdef);
+  APFloat nan_0123[2] = {APFloat::getNaN(APFloat::IEEEdouble(), false, 0x0123),
+                         APFloat::getNaN(APFloat::IEEEdouble(), false, 0x0123)};
+  APFloat mnan_4567[2] = {APFloat::getNaN(APFloat::IEEEdouble(), true, 0x4567),
+                          APFloat::getNaN(APFloat::IEEEdouble(), true, 0x4567)};
+  APFloat nan_89ab[2] = {
+      APFloat::getSNaN(APFloat::IEEEdouble(), false, &intPayload_89ab),
+      APFloat::getNaN(APFloat::IEEEdouble(), false, 0x89ab)};
+  APFloat mnan_cdef[2] = {
+      APFloat::getSNaN(APFloat::IEEEdouble(), true, &intPayload_cdef),
+      APFloat::getNaN(APFloat::IEEEdouble(), true, 0xcdef)};
+
+  EXPECT_EQ(1.0, minimumnum(f1, f2).convertToDouble());
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arsenm wrote:

Can compare to f1 and avoid the convertToDouble 

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