1 files changed, 75 insertions, 0 deletions
diff --git a/libc/test/src/math/fminl_test.cpp b/libc/test/src/math/fminl_test.cpp
new file mode 100644
index 000000000000..519c1f33fba6
--- /dev/null
+++ b/libc/test/src/math/fminl_test.cpp
@@ -0,0 +1,75 @@
+//===-- Unittests for fmin -----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#include <vector>
+
+#include "include/math.h"
+#include "src/math/fminl.h"
+#include "utils/FPUtil/FPBits.h"
+#include "utils/UnitTest/Test.h"
+
+using FPBits = __llvm_libc::fputil::FPBits<long double>;
+
+long double nan = static_cast<long double>(FPBits::buildNaN(1));
+long double inf = static_cast<long double>(FPBits::inf());
+long double negInf = static_cast<long double>(FPBits::negInf());
+
+TEST(FminlTest, NaNArg) {
+  EXPECT_EQ(inf, __llvm_libc::fminl(nan, inf));
+  EXPECT_EQ(negInf, __llvm_libc::fminl(negInf, nan));
+  EXPECT_EQ(0.0L, __llvm_libc::fminl(nan, 0.0L));
+  EXPECT_EQ(-0.0L, __llvm_libc::fminl(-0.0L, nan));
+  EXPECT_EQ(-1.2345L, __llvm_libc::fminl(nan, -1.2345L));
+  EXPECT_EQ(1.2345L, __llvm_libc::fminl(1.2345L, nan));
+  EXPECT_NE(isnan(__llvm_libc::fminl(nan, nan)), 0);
+}
+
+TEST(FminlTest, InfArg) {
+  EXPECT_EQ(negInf, __llvm_libc::fminl(negInf, inf));
+  EXPECT_EQ(0.0L, __llvm_libc::fminl(inf, 0.0L));
+  EXPECT_EQ(-0.0L, __llvm_libc::fminl(-0.0L, inf));
+  EXPECT_EQ(1.2345L, __llvm_libc::fminl(inf, 1.2345L));
+  EXPECT_EQ(-1.2345L, __llvm_libc::fminl(-1.2345L, inf));
+}
+
+TEST(FminlTest, NegInfArg) {
+  EXPECT_EQ(negInf, __llvm_libc::fminl(inf, negInf));
+  EXPECT_EQ(negInf, __llvm_libc::fminl(negInf, 0.0L));
+  EXPECT_EQ(negInf, __llvm_libc::fminl(-0.0L, negInf));
+  EXPECT_EQ(negInf, __llvm_libc::fminl(negInf, -1.2345L));
+  EXPECT_EQ(negInf, __llvm_libc::fminl(1.2345L, negInf));
+}
+
+TEST(FminlTest, BothZero) {
+  EXPECT_EQ(0.0L, __llvm_libc::fminl(0.0L, 0.0L));
+  EXPECT_EQ(-0.0L, __llvm_libc::fminl(-0.0L, 0.0L));
+  EXPECT_EQ(-0.0L, __llvm_libc::fminl(0.0L, -0.0L));
+  EXPECT_EQ(-0.0L, __llvm_libc::fminl(-0.0L, -0.0L));
+}
+
+TEST(FminlTest, InLongDoubleRange) {
+  using UIntType = FPBits::UIntType;
+  constexpr UIntType count = 10000000;
+  constexpr UIntType step = UIntType(-1) / count;
+  for (UIntType i = 0, v = 0, w = UIntType(-1); i <= count;
+       ++i, v += step, w -= step) {
+    long double x = FPBits(v), y = FPBits(w);
+    if (isnan(x) || isinf(x))
+      continue;
+    if (isnan(y) || isinf(y))
+      continue;
+    if ((x == 0) && (y == 0))
+      continue;
+
+    if (x < y) {
+      ASSERT_EQ(x, __llvm_libc::fminl(x, y));
+    } else {
+      ASSERT_EQ(y, __llvm_libc::fminl(x, y));
+    }
+  }
+}