Until we have a "ALIGN" pseudo instruction, have asm printer emitted a .align

to ensure the instruction that follows a TBB (when the number of table entries
is odd) is 2-byte aligned.
Patch by Sandeep Patel.

llvm-svn: 77705

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp b/llvm/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
index a80a88e1d35..5feafb42977 100644
--- a/llvm/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
+++ b/llvm/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
@@ -988,6 +988,13 @@ void ARMAsmPrinter::printJT2BlockOperand(const MachineInstr *MI, int OpNum) {
     if (i != e-1)
       O << '\n';
   }
+
+  // Make sure the instruction that follows TBB is 2-byte aligned.
+  // FIXME: Constant island pass should insert an "ALIGN" instruction instead.
+  if (ByteOffset && (JTBBs.size() & 1)) {
+    O << '\n';
+    EmitAlignment(1);
+  }
 }
 
 void ARMAsmPrinter::printTBAddrMode(const MachineInstr *MI, int OpNum) {