From 0c2ff8cbfd13804ae7a965960a35c51ac7fb4a0d Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Tue, 11 Feb 2014 20:48:39 +0000
Subject: [PATCH] ARM: Thumb2 LDR(literal) can target SP.

Fix a slightly overzealous destination register restriction for the
'without .w' alias. Add some explicit testcases.

rdar://16033140

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201173 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMInstrThumb2.td        | 2 +-
 test/MC/ARM/basic-thumb2-instructions.s | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td
index dd53ff6ccf0..e0bed42051d 100644
--- a/lib/Target/ARM/ARMInstrThumb2.td
+++ b/lib/Target/ARM/ARMInstrThumb2.td
@@ -4365,7 +4365,7 @@ def : t2InstAlias<"ldrsh${p} $Rt, $addr",
                   (t2LDRSHs rGPR:$Rt, t2addrmode_so_reg:$addr, pred:$p)>;
 
 def : t2InstAlias<"ldr${p} $Rt, $addr",
-                  (t2LDRpci rGPR:$Rt, t2ldrlabel:$addr, pred:$p)>;
+                  (t2LDRpci GPRnopc:$Rt, t2ldrlabel:$addr, pred:$p)>;
 def : t2InstAlias<"ldrb${p} $Rt, $addr",
                   (t2LDRBpci rGPR:$Rt, t2ldrlabel:$addr, pred:$p)>;
 def : t2InstAlias<"ldrh${p} $Rt, $addr",
diff --git a/test/MC/ARM/basic-thumb2-instructions.s b/test/MC/ARM/basic-thumb2-instructions.s
index 3a5f48832c1..d1f7c449cee 100644
--- a/test/MC/ARM/basic-thumb2-instructions.s
+++ b/test/MC/ARM/basic-thumb2-instructions.s
@@ -800,11 +800,14 @@ _func:
 @------------------------------------------------------------------------------
         ldr.w r5, _foo
         ldr   lr, (_strcmp-4)
+        ldr sp, _foo
 
 @ CHECK: ldr.w	r5, _foo                @ encoding: [0x5f'A',0xf8'A',A,0x50'A']
 @ CHECK: @   fixup A - offset: 0, value: _foo, kind: fixup_t2_ldst_pcrel_12
 @ CHECK: ldr.w	lr, _strcmp-4           @ encoding: [0x5f'A',0xf8'A',A,0xe0'A']
 @ CHECK: @   fixup A - offset: 0, value: _strcmp-4, kind: fixup_t2_ldst_pcrel_12
+@ CHECK: ldr.w sp, _foo                 @ encoding: [0x5f'A',0xf8'A',A,0xd0'A']
+@ CHECK: @   fixup A - offset: 0, value: _foo, kind: fixup_t2_ldst_pcrel_12
 
         ldr r7, [pc, #8]
         ldr.n r7, [pc, #8]
@@ -818,6 +821,7 @@ _func:
         ldr r8, [pc, #132]
         ldr pc, [pc, #256]
         ldr pc, [pc, #-400]
+        ldr sp, [pc, #4]
 
 @ CHECK: ldr	r7, [pc, #8]            @ encoding: [0x02,0x4f]
 @ CHECK: ldr	r7, [pc, #8]            @ encoding: [0x02,0x4f]
@@ -831,6 +835,7 @@ _func:
 @ CHECK: ldr.w	r8, [pc, #132]        @ encoding: [0xdf,0xf8,0x84,0x80]
 @ CHECK: ldr.w	pc, [pc, #256]          @ encoding: [0xdf,0xf8,0x00,0xf1]
 @ CHECK: ldr.w	pc, [pc, #-400]         @ encoding: [0x5f,0xf8,0x90,0xf1]
+@ CHECK: ldr.w  sp, [pc, #4]            @ encoding: [0xdf,0xf8,0x04,0xd0]
 
         ldrb  r9, [pc, #-0]
         ldrsb r11, [pc, #-0]