From f6bc4ae4a1a2dbf986099ab7b74106e8d273cbe1 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Tue, 14 Jul 2009 01:49:27 +0000
Subject: [PATCH] 1. In Thumb mode, select tBx instead of ARM variants. 2. BX
 does not "use" the link register, it defines it. 3. Fix a couple more places
 in thumb td file that still uses pre-UAL syntax.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75585 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMInstrInfo.td  | 32 ++++++++++++++------------------
 lib/Target/ARM/ARMInstrThumb.td |  4 ++--
 2 files changed, 16 insertions(+), 20 deletions(-)

diff --git a/lib/Target/ARM/ARMInstrInfo.td b/lib/Target/ARM/ARMInstrInfo.td
index 17e7365962b..e53abefd72e 100644
--- a/lib/Target/ARM/ARMInstrInfo.td
+++ b/lib/Target/ARM/ARMInstrInfo.td
@@ -617,15 +617,13 @@ let isCall = 1, Itinerary = IIC_Br,
     let Inst{27-20} = 0b00010010;
   }
 
-  let Uses = [LR] in {
-    // ARMv4T
-    def BX : ABXIx2<(outs), (ins GPR:$func, variable_ops),
-                     "mov lr, pc\n\tbx $func",
-                    [(ARMcall_nolink GPR:$func)]>, Requires<[IsNotDarwin]> {
-      let Inst{7-4}   = 0b0001;
-      let Inst{19-8}  = 0b111111111111;
-      let Inst{27-20} = 0b00010010;
-    }
+  // ARMv4T
+  def BX : ABXIx2<(outs), (ins GPR:$func, variable_ops),
+                   "mov lr, pc\n\tbx $func",
+                  [(ARMcall_nolink GPR:$func)]>, Requires<[IsNotDarwin]> {
+    let Inst{7-4}   = 0b0001;
+    let Inst{19-8}  = 0b111111111111;
+    let Inst{27-20} = 0b00010010;
   }
 }
 
@@ -650,15 +648,13 @@ let isCall = 1, Itinerary = IIC_Br,
     let Inst{27-20} = 0b00010010;
   }
 
-  let Uses = [LR] in {
-    // ARMv4T
-    def BXr9 : ABXIx2<(outs), (ins GPR:$func, variable_ops),
-                     "mov lr, pc\n\tbx $func",
-                    [(ARMcall_nolink GPR:$func)]>, Requires<[IsDarwin]> {
-      let Inst{7-4}   = 0b0001;
-      let Inst{19-8}  = 0b111111111111;
-      let Inst{27-20} = 0b00010010;
-    }
+  // ARMv4T
+  def BXr9 : ABXIx2<(outs), (ins GPR:$func, variable_ops),
+                   "mov lr, pc\n\tbx $func",
+                  [(ARMcall_nolink GPR:$func)]>, Requires<[IsARM, IsDarwin]> {
+    let Inst{7-4}   = 0b0001;
+    let Inst{19-8}  = 0b111111111111;
+    let Inst{27-20} = 0b00010010;
   }
 }
 
diff --git a/lib/Target/ARM/ARMInstrThumb.td b/lib/Target/ARM/ARMInstrThumb.td
index f2c5a4654ad..b1b97ad6ae6 100644
--- a/lib/Target/ARM/ARMInstrThumb.td
+++ b/lib/Target/ARM/ARMInstrThumb.td
@@ -180,7 +180,7 @@ let isCall = 1,
                   [(ARMtcall tGPR:$func)]>, Requires<[HasV5T]>;
   // ARMv4T
   def tBX : T1Ix2<(outs), (ins tGPR:$func, variable_ops),
-                  "cpy lr, pc\n\tbx $func",
+                  "mov lr, pc\n\tbx $func",
                   [(ARMcall_nolink tGPR:$func)]>;
 }
 
@@ -196,7 +196,7 @@ let isBranch = 1, isTerminator = 1 in {
 
   def tBR_JTr : T1JTI<(outs),
                       (ins tGPR:$target, jtblock_operand:$jt, i32imm:$id),
-                      "cpy pc, $target \n\t.align\t2\n$jt",
+                      "mov pc, $target \n\t.align\t2\n$jt",
                       [(ARMbrjt tGPR:$target, tjumptable:$jt, imm:$id)]>;
   }
 }