Add various coarse bit-width architecture predicates to llvm::Triple.

These are very useful for frontends and other utilities reasoning about
or selecting between triples.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149353 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 125 insertions, 0 deletions

diff --git a/include/llvm/ADT/Triple.h b/include/llvm/ADT/Triple.h
index d998ddd..6299e14 100644
--- a/include/llvm/ADT/Triple.h
+++ b/include/llvm/ADT/Triple.h
@@ -241,6 +241,25 @@ public:
   /// @name Convenience Predicates
   /// @{
 
+  /// \brief Test whether the architecture is 64-bit
+  ///
+  /// Note that this tests for 64-bit pointer width, and nothing else. Note
+  /// that we intentionally expose only three predicates, 64-bit, 32-bit, and
+  /// 16-bit. The inner details of pointer width for particular architectures
+  /// is not summed up in the triple, and so only a coarse grained predicate
+  /// system is provided.
+  bool isArch64Bit() const;
+
+  /// \brief Test whether the architecture is 32-bit
+  ///
+  /// Note that this tests for 32-bit pointer width, and nothing else.
+  bool isArch32Bit() const;
+
+  /// \brief Test whether the architecture is 16-bit
+  ///
+  /// Note that this tests for 16-bit pointer width, and nothing else.
+  bool isArch16Bit() const;
+
   /// isOSVersionLT - Helper function for doing comparisons against version
   /// numbers included in the target triple.
   bool isOSVersionLT(unsigned Major, unsigned Minor = 0,
diff --git a/lib/Support/Triple.cpp b/lib/Support/Triple.cpp
index e69d438..d726fa3 100644
--- a/lib/Support/Triple.cpp
+++ b/lib/Support/Triple.cpp
@@ -665,3 +665,52 @@ void Triple::setEnvironmentName(StringRef Str) {
 void Triple::setOSAndEnvironmentName(StringRef Str) {
   setTriple(getArchName() + "-" + getVendorName() + "-" + Str);
 }
+
+static unsigned getArchPointerBitWidth(llvm::Triple::ArchType Arch) {
+  switch (Arch) {
+  case llvm::Triple::UnknownArch:
+  case llvm::Triple::InvalidArch:
+    return 0;
+
+  case llvm::Triple::msp430:
+    return 16;
+
+  case llvm::Triple::amdil:
+  case llvm::Triple::arm:
+  case llvm::Triple::cellspu:
+  case llvm::Triple::hexagon:
+  case llvm::Triple::le32:
+  case llvm::Triple::mblaze:
+  case llvm::Triple::mips:
+  case llvm::Triple::mipsel:
+  case llvm::Triple::ppc:
+  case llvm::Triple::ptx32:
+  case llvm::Triple::sparc:
+  case llvm::Triple::tce:
+  case llvm::Triple::thumb:
+  case llvm::Triple::x86:
+  case llvm::Triple::xcore:
+    return 32;
+
+  case llvm::Triple::mips64:
+  case llvm::Triple::mips64el:
+  case llvm::Triple::ppc64:
+  case llvm::Triple::ptx64:
+  case llvm::Triple::sparcv9:
+  case llvm::Triple::x86_64:
+    return 64;
+  }
+  llvm_unreachable("Invalid architecture value");
+}
+
+bool Triple::isArch64Bit() const {
+  return getArchPointerBitWidth(getArch()) == 64;
+}
+
+bool Triple::isArch32Bit() const {
+  return getArchPointerBitWidth(getArch()) == 32;
+}
+
+bool Triple::isArch16Bit() const {
+  return getArchPointerBitWidth(getArch()) == 16;
+}
diff --git a/unittests/ADT/TripleTest.cpp b/unittests/ADT/TripleTest.cpp
index 160b692..28bb928 100644
--- a/unittests/ADT/TripleTest.cpp
+++ b/unittests/ADT/TripleTest.cpp
@@ -267,4 +267,61 @@ TEST(TripleTest, MutateName) {
 
 }
 
+TEST(TripleTest, BitWidthPredicates) {
+  Triple T;
+  EXPECT_FALSE(T.isArch16Bit());
+  EXPECT_FALSE(T.isArch32Bit());
+  EXPECT_FALSE(T.isArch64Bit());
+
+  T.setArch(Triple::InvalidArch);
+  EXPECT_FALSE(T.isArch16Bit());
+  EXPECT_FALSE(T.isArch32Bit());
+  EXPECT_FALSE(T.isArch64Bit());
+
+  T.setArch(Triple::arm);
+  EXPECT_FALSE(T.isArch16Bit());
+  EXPECT_TRUE(T.isArch32Bit());
+  EXPECT_FALSE(T.isArch64Bit());
+
+  T.setArch(Triple::hexagon);
+  EXPECT_FALSE(T.isArch16Bit());
+  EXPECT_TRUE(T.isArch32Bit());
+  EXPECT_FALSE(T.isArch64Bit());
+
+  T.setArch(Triple::mips);
+  EXPECT_FALSE(T.isArch16Bit());
+  EXPECT_TRUE(T.isArch32Bit());
+  EXPECT_FALSE(T.isArch64Bit());
+
+  T.setArch(Triple::mips64);
+  EXPECT_FALSE(T.isArch16Bit());
+  EXPECT_FALSE(T.isArch32Bit());
+  EXPECT_TRUE(T.isArch64Bit());
+
+  T.setArch(Triple::msp430);
+  EXPECT_TRUE(T.isArch16Bit());
+  EXPECT_FALSE(T.isArch32Bit());
+  EXPECT_FALSE(T.isArch64Bit());
+
+  T.setArch(Triple::ppc);
+  EXPECT_FALSE(T.isArch16Bit());
+  EXPECT_TRUE(T.isArch32Bit());
+  EXPECT_FALSE(T.isArch64Bit());
+
+  T.setArch(Triple::ppc64);
+  EXPECT_FALSE(T.isArch16Bit());
+  EXPECT_FALSE(T.isArch32Bit());
+  EXPECT_TRUE(T.isArch64Bit());
+
+  T.setArch(Triple::x86);
+  EXPECT_FALSE(T.isArch16Bit());
+  EXPECT_TRUE(T.isArch32Bit());
+  EXPECT_FALSE(T.isArch64Bit());
+
+  T.setArch(Triple::x86_64);
+  EXPECT_FALSE(T.isArch16Bit());
+  EXPECT_FALSE(T.isArch32Bit());
+  EXPECT_TRUE(T.isArch64Bit());
+}
+
 }