Added tests for math utility functions; fixed another test's header comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68249 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 105 insertions, 1 deletions

diff --git a/unittests/Support/MathExtrasTest.cpp b/unittests/Support/MathExtrasTest.cpp
new file mode 100644
index 0000000000..55b3613dff
--- /dev/null
+++ b/unittests/Support/MathExtrasTest.cpp
@@ -0,0 +1,104 @@
+//===- llvm/unittest/Support/MathExtrasTest.cpp - math utils tests --------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "gtest/gtest.h"
+#include "llvm/Support/MathExtras.h"
+
+using namespace llvm;
+
+namespace {
+
+TEST(MathExtras, isPowerOf2_32) {
+  EXPECT_TRUE(isPowerOf2_32(1 << 6));
+  EXPECT_TRUE(isPowerOf2_32(1 << 12));
+  EXPECT_FALSE(isPowerOf2_32((1 << 19) + 3));
+  EXPECT_FALSE(isPowerOf2_32(0xABCDEF0));
+}
+
+TEST(MathExtras, isPowerOf2_64) {
+  EXPECT_TRUE(isPowerOf2_64(1LL << 46));
+  EXPECT_TRUE(isPowerOf2_64(1LL << 12));
+  EXPECT_FALSE(isPowerOf2_64((1LL << 53) + 3));
+  EXPECT_FALSE(isPowerOf2_64(0xABCDEF0ABCDEF0));
+}
+
+TEST(MathExtras, ByteSwap_32) {
+  EXPECT_EQ(0x44332211u, ByteSwap_32(0x11223344));
+  EXPECT_EQ(0xDDCCBBAAu, ByteSwap_32(0xAABBCCDD));
+}
+
+TEST(MathExtras, ByteSwap_64) {
+  EXPECT_EQ(0x8877665544332211ULL, ByteSwap_64(0x1122334455667788));
+  EXPECT_EQ(0x1100FFEEDDCCBBAAULL, ByteSwap_64(0xAABBCCDDEEFF0011));
+}
+
+TEST(MathExtras, CountLeadingZeros_32) {
+  EXPECT_EQ(8u, CountLeadingZeros_32(0x00F000FF));
+  EXPECT_EQ(8u, CountLeadingZeros_32(0x00F12345));
+  for (unsigned i = 0; i <= 30; ++i) {
+    EXPECT_EQ(31 - i, CountLeadingZeros_32(1 << i));
+  }
+}
+
+TEST(MathExtras, CountLeadingZeros_64) {
+  EXPECT_EQ(8u, CountLeadingZeros_64(0x00F1234500F12345));
+  EXPECT_EQ(1u, CountLeadingZeros_64(1LL << 62));
+  for (unsigned i = 0; i <= 62; ++i) {
+    EXPECT_EQ(63 - i, CountLeadingZeros_64(1LL << i));
+  }
+}
+
+TEST(MathExtras, CountLeadingOnes_32) {
+  for (int i = 30; i >= 0; --i) {
+    // Start with all ones and unset some bit.
+    EXPECT_EQ(31u - i, CountLeadingOnes_32(0xFFFFFFFF ^ (1 << i)));
+  }
+}
+
+TEST(MathExtras, CountLeadingOnes_64) {
+  for (int i = 62; i >= 0; --i) {
+    // Start with all ones and unset some bit.
+    EXPECT_EQ(63u - i, CountLeadingOnes_64(0xFFFFFFFFFFFFFFFF ^ (1LL << i)));
+  }
+  for (int i = 30; i >= 0; --i) {
+    // Start with all ones and unset some bit.
+    EXPECT_EQ(31u - i, CountLeadingOnes_32(0xFFFFFFFF ^ (1 << i)));
+  }
+}
+
+TEST(MathExtras, FloatBits) {
+  static const float kValue = 5632.34;
+  EXPECT_FLOAT_EQ(kValue, BitsToFloat(FloatToBits(kValue)));
+}
+
+TEST(MathExtras, DoubleBits) {
+  static const double kValue = 87987234.983498;
+  EXPECT_FLOAT_EQ(kValue, BitsToDouble(DoubleToBits(kValue)));
+}
+
+TEST(MathExtras, MinAlign) {
+  EXPECT_EQ(1u, MinAlign(2, 3));
+  EXPECT_EQ(2u, MinAlign(2, 4));
+  EXPECT_EQ(1u, MinAlign(17, 64));
+  EXPECT_EQ(256u, MinAlign(256, 512));
+}
+
+TEST(MathExtras, NextPowerOf2) {
+  EXPECT_EQ(4u, NextPowerOf2(3));
+  EXPECT_EQ(16u, NextPowerOf2(15));
+  EXPECT_EQ(256u, NextPowerOf2(128));
+}
+
+TEST(MathExtras, RoundUpToAlignment) {
+  EXPECT_EQ(8u, RoundUpToAlignment(5, 8));
+  EXPECT_EQ(24u, RoundUpToAlignment(17, 8));
+  EXPECT_EQ(0u, RoundUpToAlignment(~0LL, 8));
+}
+
+}
diff --git a/unittests/Support/raw_ostream_test.cpp b/unittests/Support/raw_ostream_test.cpp
index 7b86b2341a..feb0152bbe 100644
--- a/unittests/Support/raw_ostream_test.cpp
+++ b/unittests/Support/raw_ostream_test.cpp
@@ -1,4 +1,4 @@
-//===- llvm/unittest/Support/raw_ostream.cpp - raw_ostream unit tests -----===//
+//===- llvm/unittest/Support/raw_ostream_test.cpp - raw_ostream tests -----===//
 //
 //                     The LLVM Compiler Infrastructure
 //