From 4ec6e888ec6d12b5255afd685b05c8fee1f7fc73 Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Fri, 19 Aug 2011 20:46:54 +0000
Subject: [PATCH] Thumb assembly parsing and encoding for MOV.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138076 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMInstrFormats.td         |  2 +-
 lib/Target/ARM/ARMInstrThumb.td           |  5 +++++
 lib/Target/ARM/AsmParser/ARMAsmParser.cpp |  2 +-
 test/MC/ARM/basic-thumb-instructions.s    | 22 ++++++++++++++++++++++
 test/MC/ARM/thumb-diagnostics.s           |  8 +++++---
 5 files changed, 34 insertions(+), 5 deletions(-)

diff --git a/lib/Target/ARM/ARMInstrFormats.td b/lib/Target/ARM/ARMInstrFormats.td
index 17a82b1024e..0f4b2648cf1 100644
--- a/lib/Target/ARM/ARMInstrFormats.td
+++ b/lib/Target/ARM/ARMInstrFormats.td
@@ -148,7 +148,7 @@ def iflags_op : Operand<i32> {
 // ARM Predicate operand. Default to 14 = always (AL). Second part is CC
 // register whose default is 0 (no register).
 def CondCodeOperand : AsmOperandClass { let Name = "CondCode"; }
-def pred : PredicateOperand<OtherVT, (ops i32imm, CCR),
+def pred : PredicateOperand<OtherVT, (ops i32imm, i32imm),
                                      (ops (i32 14), (i32 zero_reg))> {
   let PrintMethod = "printPredicateOperand";
   let ParserMatchClass = CondCodeOperand;
diff --git a/lib/Target/ARM/ARMInstrThumb.td b/lib/Target/ARM/ARMInstrThumb.td
index b19cccbd992..5825f9bedef 100644
--- a/lib/Target/ARM/ARMInstrThumb.td
+++ b/lib/Target/ARM/ARMInstrThumb.td
@@ -1014,6 +1014,11 @@ def tMOVi8 : T1sI<(outs tGPR:$Rd), (ins imm0_255:$imm8), IIC_iMOVi,
   let Inst{10-8} = Rd;
   let Inst{7-0}  = imm8;
 }
+// Because we have an explicit tMOVSr below, we need an alias to handle
+// the immediate "movs" form here. Blech.
+def : InstAlias <"movs $Rdn, $imm",
+                 (tMOVi8 tGPR:$Rdn, CPSR, imm0_255:$imm, 14, 0)>,
+        Requires<[IsThumb]>;
 
 // A7-73: MOV(2) - mov setting flag.
 
diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index 7197b99b25b..33399ec14f8 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -3173,7 +3173,7 @@ unsigned ARMAsmParser::checkTargetMatchPredicate(MCInst &Inst) {
            isARMLowRegister(Inst.getOperand(2).getReg()))
     return Match_RequiresThumb2;
   // Others only require ARMv6 or later.
-  else if (Opc == ARM::tMOVr && isThumbOne() &&
+  else if (Opc == ARM::tMOVr && isThumbOne() && !hasV6Ops() &&
            isARMLowRegister(Inst.getOperand(0).getReg()) &&
            isARMLowRegister(Inst.getOperand(1).getReg()))
     return Match_RequiresV6;
diff --git a/test/MC/ARM/basic-thumb-instructions.s b/test/MC/ARM/basic-thumb-instructions.s
index 0bb528b49d6..c2d6f4290dd 100644
--- a/test/MC/ARM/basic-thumb-instructions.s
+++ b/test/MC/ARM/basic-thumb-instructions.s
@@ -296,3 +296,25 @@ _func:
         lsrs r2, r6
 
 @ CHECK: lsrs	r2, r6                  @ encoding: [0xf2,0x40]
+
+
+@------------------------------------------------------------------------------
+@ MOV (immediate)
+@------------------------------------------------------------------------------
+        movs r2, #0
+        movs r2, #255
+        movs r2, #23
+
+@ CHECK: movs	r2, #0                  @ encoding: [0x00,0x22]
+@ CHECK: movs	r2, #255                @ encoding: [0xff,0x22]
+@ CHECK: movs	r2, #23                 @ encoding: [0x17,0x22]
+
+
+@------------------------------------------------------------------------------
+@ MOV (register)
+@------------------------------------------------------------------------------
+        mov r3, r4
+        movs r1, r3
+
+@ CHECK: mov	r3, r4                  @ encoding: [0x23,0x46]
+@ CHECK: movs	r1, r3                  @ encoding: [0x19,0x00]
diff --git a/test/MC/ARM/thumb-diagnostics.s b/test/MC/ARM/thumb-diagnostics.s
index df8f2262caa..6deccacfbd2 100644
--- a/test/MC/ARM/thumb-diagnostics.s
+++ b/test/MC/ARM/thumb-diagnostics.s
@@ -1,5 +1,7 @@
 @ RUN: not llvm-mc -triple=thumbv6-apple-darwin < %s 2> %t
 @ RUN: FileCheck --check-prefix=CHECK-ERRORS < %t %s
+@ RUN: not llvm-mc -triple=thumbv5-apple-darwin < %s 2> %t
+@ RUN: FileCheck --check-prefix=CHECK-ERRORS-V5 < %t %s
 
 @ Check for various assembly diagnostic messages on invalid input.
 
@@ -15,9 +17,9 @@
 @ CHECK-ERRORS: error: instruction variant requires Thumb2
 @ CHECK-ERRORS:         add r2, r3
 @ CHECK-ERRORS:         ^
-@ CHECK-ERRORS: error: instruction variant requires ARMv6 or later
-@ CHECK-ERRORS:         mov r2, r3
-@ CHECK-ERRORS:         ^
+@ CHECK-ERRORS-V5: error: instruction variant requires ARMv6 or later
+@ CHECK-ERRORS-V5:         mov r2, r3
+@ CHECK-ERRORS-V5:         ^
 
 
 @ Out of range immediates for ASR instruction.
-- 
2.11.0