[Alignment][NFC] Move and type functions from MathExtras to Alignment

Summary:
This is patch is part of a series to introduce an Alignment type.
See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2019-July/133851.html
See this patch for the introduction of the type: https://reviews.llvm.org/D64790

Reviewers: courbet

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68942

llvm-svn: 374773

1 files changed, 40 insertions, 2 deletions

diff --git a/llvm/unittests/Support/AlignmentTest.cpp b/llvm/unittests/Support/AlignmentTest.cpp
index a6c053385cb..35fac5e51a1 100644
--- a/llvm/unittests/Support/AlignmentTest.cpp
+++ b/llvm/unittests/Support/AlignmentTest.cpp
@@ -90,6 +90,11 @@ TEST(AlignmentTest, AlignTo) {
     uint64_t alignment;
     uint64_t offset;
     uint64_t rounded;
+    const void *forgedAddr() const {
+      //  A value of any integral or enumeration type can be converted to a
+      //  pointer type.
+      return reinterpret_cast<const void *>(offset);
+    }
   } kTests[] = {
       // MaybeAlign
       {0, 0, 0},
@@ -116,6 +121,7 @@ TEST(AlignmentTest, AlignTo) {
     // Test Align
     if (A) {
       EXPECT_EQ(alignTo(T.offset, A.getValue()), T.rounded);
+      EXPECT_EQ(alignAddr(T.forgedAddr(), A.getValue()), T.rounded);
     }
   }
 }
@@ -174,13 +180,17 @@ TEST(AlignmentTest, Encode_Decode) {
   EXPECT_EQ(Expected, Actual);
 }
 
-TEST(AlignmentTest, isAligned) {
+TEST(AlignmentTest, isAligned_isAddrAligned) {
   struct {
     uint64_t alignment;
     uint64_t offset;
     bool isAligned;
+    const void *forgedAddr() const {
+      //  A value of any integral or enumeration type can be converted to a
+      //  pointer type.
+      return reinterpret_cast<const void *>(offset);
+    }
   } kTests[] = {
-      // MaybeAlign / Align
       {1, 0, true},  {1, 1, true},  {1, 5, true},  {2, 0, true},
       {2, 1, false}, {2, 2, true},  {2, 7, false}, {2, 16, true},
       {4, 0, true},  {4, 1, false}, {4, 4, true},  {4, 6, false},
@@ -192,10 +202,32 @@ TEST(AlignmentTest, isAligned) {
     // Test Align
     if (A) {
       EXPECT_EQ(isAligned(A.getValue(), T.offset), T.isAligned);
+      EXPECT_EQ(isAddrAligned(A.getValue(), T.forgedAddr()), T.isAligned);
     }
   }
 }
 
+TEST(AlignmentTest, offsetToAlignment) {
+  struct {
+    uint64_t alignment;
+    uint64_t offset;
+    uint64_t alignedOffset;
+    const void *forgedAddr() const {
+      //  A value of any integral or enumeration type can be converted to a
+      //  pointer type.
+      return reinterpret_cast<const void *>(offset);
+    }
+  } kTests[] = {
+      {1, 0, 0}, {1, 1, 0},  {1, 5, 0}, {2, 0, 0}, {2, 1, 1}, {2, 2, 0},
+      {2, 7, 1}, {2, 16, 0}, {4, 0, 0}, {4, 1, 3}, {4, 4, 0}, {4, 6, 2},
+  };
+  for (const auto &T : kTests) {
+    const Align A(T.alignment);
+    EXPECT_EQ(offsetToAlignment(T.offset, A), T.alignedOffset);
+    EXPECT_EQ(offsetToAlignedAddr(T.forgedAddr(), A), T.alignedOffset);
+  }
+}
+
 TEST(AlignmentTest, AlignComparisons) {
   std::vector<uint64_t> ValidAlignments = getValidAlignments();
   std::sort(ValidAlignments.begin(), ValidAlignments.end());
@@ -349,6 +381,12 @@ TEST(AlignmentDeathTest, CompareAlignToUndefMaybeAlign) {
   }
 }
 
+TEST(AlignmentDeathTest, AlignAddr) {
+  const void *const unaligned_high_ptr =
+      reinterpret_cast<const void *>(std::numeric_limits<uintptr_t>::max() - 1);
+  EXPECT_DEATH(alignAddr(unaligned_high_ptr, Align(16)), "Overflow");
+}
+
 #endif // NDEBUG
 
 } // end anonymous namespace