1 files changed, 12 insertions, 6 deletions

diff --git a/unittests/Support/BlockFrequencyTest.cpp b/unittests/Support/BlockFrequencyTest.cpp
index 0eac8bb8811b..c1f5671815bd 100644
--- a/unittests/Support/BlockFrequencyTest.cpp
+++ b/unittests/Support/BlockFrequencyTest.cpp
@@ -19,7 +19,7 @@ namespace {
 
 TEST(BlockFrequencyTest, OneToZero) {
   BlockFrequency Freq(1);
-  BranchProbability Prob(UINT32_MAX - 1, UINT32_MAX);
+  BranchProbability Prob(UINT32_MAX / 3, UINT32_MAX);
   Freq *= Prob;
   EXPECT_EQ(Freq.getFrequency(), 0u);
 
@@ -54,11 +54,11 @@ TEST(BlockFrequencyTest, MaxToHalfMax) {
   BlockFrequency Freq(UINT64_MAX);
   BranchProbability Prob(UINT32_MAX / 2, UINT32_MAX);
   Freq *= Prob;
-  EXPECT_EQ(Freq.getFrequency(), 9223372034707292159ULL);
+  EXPECT_EQ(Freq.getFrequency(), 9223372036854775807ULL);
 
   Freq = BlockFrequency(UINT64_MAX);
   Freq *= Prob;
-  EXPECT_EQ(Freq.getFrequency(), 9223372034707292159ULL);
+  EXPECT_EQ(Freq.getFrequency(), 9223372036854775807ULL);
 }
 
 TEST(BlockFrequencyTest, BigToBig) {
@@ -88,6 +88,12 @@ TEST(BlockFrequencyTest, MaxToMax) {
   EXPECT_EQ(Freq.getFrequency(), UINT64_MAX);
 }
 
+TEST(BlockFrequencyTest, Subtract) {
+  BlockFrequency Freq1(0), Freq2(1);
+  EXPECT_EQ((Freq1 - Freq2).getFrequency(), 0u);
+  EXPECT_EQ((Freq2 - Freq1).getFrequency(), 1u);
+}
+
 TEST(BlockFrequency, Divide) {
   BlockFrequency Freq(0x3333333333333333ULL);
   Freq /= BranchProbability(1, 2);
@@ -97,18 +103,18 @@ TEST(BlockFrequency, Divide) {
 TEST(BlockFrequencyTest, Saturate) {
   BlockFrequency Freq(0x3333333333333333ULL);
   Freq /= BranchProbability(100, 300);
-  EXPECT_EQ(Freq.getFrequency(), 0x9999999999999999ULL);
+  EXPECT_EQ(Freq.getFrequency(), 0x9999999866666668ULL);
   Freq /= BranchProbability(1, 2);
   EXPECT_EQ(Freq.getFrequency(), UINT64_MAX);
 
   Freq = 0x1000000000000000ULL;
-  Freq /= BranchProbability(10000, 160000);
+  Freq /= BranchProbability(10000, 170000);
   EXPECT_EQ(Freq.getFrequency(), UINT64_MAX);
 
   // Try to cheat the multiplication overflow check.
   Freq = 0x00000001f0000001ull;
   Freq /= BranchProbability(1000, 0xf000000f);
-  EXPECT_EQ(33506781356485509ULL, Freq.getFrequency());
+  EXPECT_EQ(33527736066704712ULL, Freq.getFrequency());
 }
 
 TEST(BlockFrequencyTest, SaturatingRightShift) {