Simplify now that we always use an alignment of 2 for ELF files.

This saves 123144 bytes out of llvm-nm on powerpc64le.

llvm-svn: 238824

1 files changed, 18 insertions, 42 deletions

diff --git a/llvm/lib/Object/ELFObjectFile.cpp b/llvm/lib/Object/ELFObjectFile.cpp
index 8ccb2538ac7..8847a20d96e 100644
--- a/llvm/lib/Object/ELFObjectFile.cpp
+++ b/llvm/lib/Object/ELFObjectFile.cpp
@@ -27,51 +27,27 @@ ObjectFile::createELFObjectFile(MemoryBufferRef Obj) {
   std::size_t MaxAlignment =
       1ULL << countTrailingZeros(uintptr_t(Obj.getBufferStart()));
 
+  if (MaxAlignment < 2)
+    return object_error::parse_failed;
+
   std::error_code EC;
   std::unique_ptr<ObjectFile> R;
-  if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB)
-#if !LLVM_IS_UNALIGNED_ACCESS_FAST
-    if (MaxAlignment >= 4)
-      R.reset(new ELFObjectFile<ELFType<support::little, 4, false>>(Obj, EC));
-    else
-#endif
-    if (MaxAlignment >= 2)
-      R.reset(new ELFObjectFile<ELFType<support::little, 2, false>>(Obj, EC));
-    else
-      return object_error::parse_failed;
-  else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB)
-#if !LLVM_IS_UNALIGNED_ACCESS_FAST
-    if (MaxAlignment >= 4)
-      R.reset(new ELFObjectFile<ELFType<support::big, 4, false>>(Obj, EC));
-    else
-#endif
-    if (MaxAlignment >= 2)
-      R.reset(new ELFObjectFile<ELFType<support::big, 2, false>>(Obj, EC));
-    else
-      return object_error::parse_failed;
-  else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB)
-#if !LLVM_IS_UNALIGNED_ACCESS_FAST
-    if (MaxAlignment >= 8)
-      R.reset(new ELFObjectFile<ELFType<support::big, 8, true>>(Obj, EC));
-    else
-#endif
-    if (MaxAlignment >= 2)
-      R.reset(new ELFObjectFile<ELFType<support::big, 2, true>>(Obj, EC));
-    else
-      return object_error::parse_failed;
-  else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) {
-#if !LLVM_IS_UNALIGNED_ACCESS_FAST
-    if (MaxAlignment >= 8)
-      R.reset(new ELFObjectFile<ELFType<support::little, 8, true>>(Obj, EC));
-    else
-#endif
-    if (MaxAlignment >= 2)
-      R.reset(new ELFObjectFile<ELFType<support::little, 2, true>>(Obj, EC));
-    else
-      return object_error::parse_failed;
+  if (Ident.first == ELF::ELFCLASS32) {
+    if (Ident.second == ELF::ELFDATA2LSB)
+      R.reset(new ELFObjectFile<ELFType<support::little, false>>(Obj, EC));
+    else if (Ident.second == ELF::ELFDATA2MSB)
+      R.reset(new ELFObjectFile<ELFType<support::big, false>>(Obj, EC));
+    else
+      llvm_unreachable("Buffer is not an ELF object file!");
+  } else {
+    assert(Ident.first == ELF::ELFCLASS64);
+    if (Ident.second == ELF::ELFDATA2LSB)
+      R.reset(new ELFObjectFile<ELFType<support::little, true>>(Obj, EC));
+    else if (Ident.second == ELF::ELFDATA2MSB)
+      R.reset(new ELFObjectFile<ELFType<support::big, true>>(Obj, EC));
+    else
+      llvm_unreachable("Buffer is not an ELF object file!");
   }
-  else
-    llvm_unreachable("Buffer is not an ELF object file!");
 
   if (EC)
     return EC;