Remove host endianness info from TargetData and

put it in a new header System/Host.h instead.
Instead of getting the endianness from configure,
calculate it directly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44959 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 36 insertions, 10 deletions

diff --git a/include/llvm/Config/config.h.in b/include/llvm/Config/config.h.in
index 64858f26b9..32e154a695 100644
--- a/include/llvm/Config/config.h.in
+++ b/include/llvm/Config/config.h.in
@@ -494,9 +494,6 @@
 /* Installation prefix directory */
 #undef LLVM_PREFIX
 
-/* Define if this target is little endian */
-#undef LSB_FIRST
-
 /* Define if the OS needs help to load dependent libraries for dlopen(). */
 #undef LTDL_DLOPEN_DEPLIBS
 
@@ -514,9 +511,6 @@
 /* Define to the system default library search path. */
 #undef LTDL_SYSSEARCHPATH
 
-/* Define if this target is big endian */
-#undef MSB_FIRST
-
 /* Define if /dev/zero should be used when mapping RWX memory, or undefine if
    its not necessary */
 #undef NEED_DEV_ZERO_FOR_MMAP
diff --git a/include/llvm/System/Host.h b/include/llvm/System/Host.h
new file mode 100644
index 0000000000..df46b25527
--- /dev/null
+++ b/include/llvm/System/Host.h
@@ -0,0 +1,36 @@
+//===- llvm/System/Host.h - Host machine characteristics --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Duncan Sands and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Methods for querying the nature of the host machine.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_HOST_H
+#define LLVM_SYSTEM_HOST_H
+
+namespace llvm {
+namespace sys {
+
+  inline bool littleEndianHost() {
+    union {
+      int i;
+      char c;
+    };
+    i = 1;
+    return c;
+  }
+
+  inline bool bigEndianHost() {
+    return !littleEndianHost();
+  }
+
+}
+}
+
+#endif
diff --git a/include/llvm/Target/TargetData.h b/include/llvm/Target/TargetData.h
index fcc57a1b2a..3136a38ac0 100644
--- a/include/llvm/Target/TargetData.h
+++ b/include/llvm/Target/TargetData.h
@@ -142,10 +142,6 @@ public:
   bool          isLittleEndian()       const { return     LittleEndian; }
   bool          isBigEndian()          const { return    !LittleEndian; }
 
-  /// Host endianness.
-  bool hostIsLittleEndian() const;
-  bool hostIsBigEndian() const { return !hostIsLittleEndian(); }
-
   /// getStringRepresentation - Return the string representation of the
   /// TargetData.  This representation is in the same format accepted by the
   /// string constructor above.