From 4db7dec70b06a1d50a265c3666e126065e09f396 Mon Sep 17 00:00:00 2001
From: Eric Christopher <echristo@apple.com>
Date: Tue, 24 May 2011 23:27:13 +0000
Subject: [PATCH] Implement the arm 'L' asm modifier.

Part of rdar://9119939


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132024 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMAsmPrinter.cpp | 6 +++++-
 test/CodeGen/ARM/arm-modifier.ll | 8 ++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/lib/Target/ARM/ARMAsmPrinter.cpp b/lib/Target/ARM/ARMAsmPrinter.cpp
index f1edc55120b..02263ee45e9 100644
--- a/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -415,13 +415,17 @@ bool ARMAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
         (((Reg % 2) == 1) ? "[0]" : "[1]");
         return false;
       }
-      // Fallthrough to unsupported.
+      return true;
     case 'B': // Bitwise inverse of integer or symbol without a preceding #.
       if (!MI->getOperand(OpNum).isImm())
         return true;
       O << ~(MI->getOperand(OpNum).getImm());
       return false;
     case 'L': // The low 16 bits of an immediate constant.
+      if (!MI->getOperand(OpNum).isImm())
+        return true;
+      O << (MI->getOperand(OpNum).getImm() & 0xffff);
+      return false;
     case 'm': // The base register of a memory operand.
     case 'M': // A register range suitable for LDM/STM.
     case 'p': // The high single-precision register of a VFP double-precision
diff --git a/test/CodeGen/ARM/arm-modifier.ll b/test/CodeGen/ARM/arm-modifier.ll
index 6b0da44ed55..91629a9ab24 100644
--- a/test/CodeGen/ARM/arm-modifier.ll
+++ b/test/CodeGen/ARM/arm-modifier.ll
@@ -21,3 +21,11 @@ entry:
 call void asm sideeffect ".word ${0:B} \0A\09", "i"(i32 0) nounwind, !srcloc !0
 ret void
 }
+
+define void @f1() nounwind ssp {
+entry:
+; CHECK: f1
+; CHECK: .word 65535
+call void asm sideeffect ".word ${0:L} \0A\09", "i"(i32 -1) nounwind, !srcloc !0
+ret void
+}