Support: More BlockFrequencyTest => BranchProbabilityTest

[oota-llvm.git] / unittests / Support / BlockFrequencyTest.cpp

diff --git a/unittests/Support/BlockFrequencyTest.cpp b/unittests/Support/BlockFrequencyTest.cpp
index bcb88c889507e7ac117da82c024b3f966727aba3..f6e3537de91a979bd9a217aa16011fd7e5c9fdd6 100644 (file)
--- a/unittests/Support/BlockFrequencyTest.cpp
+++ b/unittests/Support/BlockFrequencyTest.cpp
@@ -8,27 +8,24 @@ using namespace llvm;
 
 namespace {
 
-TEST(BlockFrequencyTest, ZeroToZero) {
-  BlockFrequency Freq(0);
+TEST(BlockFrequencyTest, OneToZero) {
+  BlockFrequency Freq(1);
   BranchProbability Prob(UINT32_MAX - 1, UINT32_MAX);
   Freq *= Prob;
   EXPECT_EQ(Freq.getFrequency(), 0u);
 
-  Freq = 1;
-  Freq *= BranchProbability::getZero();
+  Freq = BlockFrequency(1);
+  Freq *= Prob;
   EXPECT_EQ(Freq.getFrequency(), 0u);
 }
 
-TEST(BlockFrequencyTest, OneToZero) {
+TEST(BlockFrequencyTest, OneToOne) {
   BlockFrequency Freq(1);
-  BranchProbability Prob(UINT32_MAX - 1, UINT32_MAX);
+  BranchProbability Prob(UINT32_MAX, UINT32_MAX);
   Freq *= Prob;
   EXPECT_EQ(Freq.getFrequency(), 1u);
-}
 
-TEST(BlockFrequencyTest, OneToOne) {
-  BlockFrequency Freq(1);
-  BranchProbability Prob(UINT32_MAX, UINT32_MAX);
+  Freq = BlockFrequency(1);
   Freq *= Prob;
   EXPECT_EQ(Freq.getFrequency(), 1u);
 }
@@ -38,6 +35,10 @@ TEST(BlockFrequencyTest, ThreeToOne) {
   BranchProbability Prob(3000000, 9000000);
   Freq *= Prob;
   EXPECT_EQ(Freq.getFrequency(), 1u);
+
+  Freq = BlockFrequency(3);
+  Freq *= Prob;
+  EXPECT_EQ(Freq.getFrequency(), 1u);
 }
 
 TEST(BlockFrequencyTest, MaxToHalfMax) {
@@ -45,6 +46,10 @@ TEST(BlockFrequencyTest, MaxToHalfMax) {
   BranchProbability Prob(UINT32_MAX / 2, UINT32_MAX);
   Freq *= Prob;
   EXPECT_EQ(Freq.getFrequency(), 9223372034707292159ULL);
+
+  Freq = BlockFrequency(UINT64_MAX);
+  Freq *= Prob;
+  EXPECT_EQ(Freq.getFrequency(), 9223372034707292159ULL);
 }
 
 TEST(BlockFrequencyTest, BigToBig) {
@@ -54,6 +59,10 @@ TEST(BlockFrequencyTest, BigToBig) {
   BranchProbability Prob(P, P);
   Freq *= Prob;
   EXPECT_EQ(Freq.getFrequency(), Big);
+
+  Freq = BlockFrequency(Big);
+  Freq *= Prob;
+  EXPECT_EQ(Freq.getFrequency(), Big);
 }
 
 TEST(BlockFrequencyTest, MaxToMax) {
@@ -61,35 +70,44 @@ TEST(BlockFrequencyTest, MaxToMax) {
   BranchProbability Prob(UINT32_MAX, UINT32_MAX);
   Freq *= Prob;
   EXPECT_EQ(Freq.getFrequency(), UINT64_MAX);
+
+  // This additionally makes sure if we have a value equal to our saturating
+  // value, we do not signal saturation if the result equals said value, but
+  // saturating does not occur.
+  Freq = BlockFrequency(UINT64_MAX);
+  Freq *= Prob;
+  EXPECT_EQ(Freq.getFrequency(), UINT64_MAX);
+}
+
+TEST(BlockFrequency, Divide) {
+  BlockFrequency Freq(0x3333333333333333ULL);
+  Freq /= BranchProbability(1, 2);
+  EXPECT_EQ(Freq.getFrequency(), 0x6666666666666666ULL);
+}
+
+TEST(BlockFrequencyTest, Saturate) {
+  BlockFrequency Freq(0x3333333333333333ULL);
+  Freq /= BranchProbability(100, 300);
+  EXPECT_EQ(Freq.getFrequency(), 0x9999999999999999ULL);
+  Freq /= BranchProbability(1, 2);
+  EXPECT_EQ(Freq.getFrequency(), UINT64_MAX);
+
+  Freq = 0x1000000000000000ULL;
+  Freq /= BranchProbability(10000, 160000);
+  EXPECT_EQ(Freq.getFrequency(), UINT64_MAX);
+
+  // Try to cheat the multiplication overflow check.
+  Freq = 0x00000001f0000001ull;
+  Freq /= BranchProbability(1000, 0xf000000f);
+  EXPECT_EQ(33506781356485509ULL, Freq.getFrequency());
 }
 
-TEST(BlockFrequencyTest, ProbabilityCompare) {
-  BranchProbability A(4, 5);
-  BranchProbability B(4U << 29, 5U << 29);
-  BranchProbability C(3, 4);
-
-  EXPECT_TRUE(A == B);
-  EXPECT_FALSE(A != B);
-  EXPECT_FALSE(A < B);
-  EXPECT_FALSE(A > B);
-  EXPECT_TRUE(A <= B);
-  EXPECT_TRUE(A >= B);
-
-  EXPECT_FALSE(B == C);
-  EXPECT_TRUE(B != C);
-  EXPECT_FALSE(B < C);
-  EXPECT_TRUE(B > C);
-  EXPECT_FALSE(B <= C);
-  EXPECT_TRUE(B >= C);
-
-  BranchProbability BigZero(0, UINT32_MAX);
-  BranchProbability BigOne(UINT32_MAX, UINT32_MAX);
-  EXPECT_FALSE(BigZero == BigOne);
-  EXPECT_TRUE(BigZero != BigOne);
-  EXPECT_TRUE(BigZero < BigOne);
-  EXPECT_FALSE(BigZero > BigOne);
-  EXPECT_TRUE(BigZero <= BigOne);
-  EXPECT_FALSE(BigZero >= BigOne);
+TEST(BlockFrequencyTest, SaturatingRightShift) {
+  BlockFrequency Freq(0x10080ULL);
+  Freq >>= 2;
+  EXPECT_EQ(Freq.getFrequency(), 0x4020ULL);
+  Freq >>= 20;
+  EXPECT_EQ(Freq.getFrequency(), 0x1ULL);
 }
 
 }