Merge commit 'a662a9862501fc86904e90054f7c1519101d9126'

Conflicts:
	include/llvm/CodeGen/IntrinsicLowering.h
	include/llvm/MC/MCAssembler.h
	include/llvm/MC/MCObjectStreamer.h
	lib/LLVMBuild.txt
	lib/Linker/LinkArchives.cpp
	lib/MC/MCAssembler.cpp
	lib/MC/MCELFStreamer.cpp
	lib/MC/MCParser/AsmParser.cpp
	lib/MC/MCPureStreamer.cpp
	lib/MC/WinCOFFStreamer.cpp
	lib/Makefile
	lib/Support/Unix/Memory.inc
	lib/Support/Unix/Process.inc
	lib/Support/Unix/Program.inc
	lib/Target/ARM/ARM.h
	lib/Target/ARM/ARMFastISel.cpp
	lib/Target/ARM/ARMISelLowering.cpp
	lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
	lib/Target/Mips/MipsInstrFPU.td
	lib/Target/X86/CMakeLists.txt
	lib/Target/X86/X86ISelLowering.cpp
	lib/Target/X86/X86TargetMachine.cpp
	lib/Target/X86/X86TargetObjectFile.cpp
	lib/Transforms/InstCombine/InstCombineCalls.cpp
	test/CodeGen/X86/fast-isel-x86-64.ll
	tools/llc/llc.cpp
	tools/lto/LTOModule.cpp
	utils/TableGen/EDEmitter.cpp

1 files changed, 28 insertions, 6 deletions

diff --git a/lib/Object/ELFObjectFile.cpp b/lib/Object/ELFObjectFile.cpp
index 663b84ec8b..2c8c1b16d1 100644
--- a/lib/Object/ELFObjectFile.cpp
+++ b/lib/Object/ELFObjectFile.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Object/ELF.h"
+#include "llvm/Support/MathExtras.h"
 
 namespace llvm {
 
@@ -22,16 +23,37 @@ ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) {
   std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object);
   error_code ec;
 
+  std::size_t MaxAlignment =
+    1ULL << CountTrailingZeros_64(uintptr_t(Object->getBufferStart()));
+
   if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB)
-    return new ELFObjectFile<support::little, false>(Object, ec);
+    if (MaxAlignment >= 4)
+      return new ELFObjectFile<support::little, 4, false>(Object, ec);
+    else if (MaxAlignment >= 2)
+      return new ELFObjectFile<support::little, 2, false>(Object, ec);
+    else
+      llvm_unreachable("Invalid alignment for ELF file!");
   else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB)
-    return new ELFObjectFile<support::big, false>(Object, ec);
+    if (MaxAlignment >= 4)
+      return new ELFObjectFile<support::big, 4, false>(Object, ec);
+    else if (MaxAlignment >= 2)
+      return new ELFObjectFile<support::big, 2, false>(Object, ec);
+    else
+      llvm_unreachable("Invalid alignment for ELF file!");
   else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB)
-    return new ELFObjectFile<support::big, true>(Object, ec);
+    if (MaxAlignment >= 8)
+      return new ELFObjectFile<support::big, 8, true>(Object, ec);
+    else if (MaxAlignment >= 2)
+      return new ELFObjectFile<support::big, 2, true>(Object, ec);
+    else
+      llvm_unreachable("Invalid alignment for ELF file!");
   else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) {
-    ELFObjectFile<support::little, true> *result =
-          new ELFObjectFile<support::little, true>(Object, ec);
-    return result;
+    if (MaxAlignment >= 8)
+      return new ELFObjectFile<support::little, 8, true>(Object, ec);
+    else if (MaxAlignment >= 2)
+      return new ELFObjectFile<support::little, 2, true>(Object, ec);
+    else
+      llvm_unreachable("Invalid alignment for ELF file!");
   }
 
   report_fatal_error("Buffer is not an ELF object file!");