From 191d33fd6d0a91e89f2a8f719e5adbdccf9effa9 Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Thu, 15 Sep 2011 20:54:14 +0000
Subject: [PATCH] Thumb2 assembly parsing and encoding for RSB.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139839 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMInstrThumb2.td        | 13 ++++++++++++
 test/MC/ARM/basic-thumb2-instructions.s | 27 +++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td
index 60435977612..3b4a69bd344 100644
--- a/lib/Target/ARM/ARMInstrThumb2.td
+++ b/lib/Target/ARM/ARMInstrThumb2.td
@@ -3845,3 +3845,16 @@ def : t2InstAlias<"pop${p} $regs", (t2LDMIA_UPD SP, pred:$p, reglist:$regs)>;
 def : t2InstAlias<"rev${p} $Rd, $Rm", (t2REV rGPR:$Rd, rGPR:$Rm, pred:$p)>;
 def : t2InstAlias<"rev16${p} $Rd, $Rm", (t2REV16 rGPR:$Rd, rGPR:$Rm, pred:$p)>;
 def : t2InstAlias<"revsh${p} $Rd, $Rm", (t2REVSH rGPR:$Rd, rGPR:$Rm, pred:$p)>;
+
+
+// Alias for RSB without the ".w" optional width specifier, and with optional
+// implied destination register.
+def : t2InstAlias<"rsb${s}${p} $Rd, $Rn, $imm",
+           (t2RSBri rGPR:$Rd, rGPR:$Rn, t2_so_imm:$imm, pred:$p, cc_out:$s)>;
+def : t2InstAlias<"rsb${s}${p} $Rdn, $imm",
+           (t2RSBri rGPR:$Rdn, rGPR:$Rdn, t2_so_imm:$imm, pred:$p, cc_out:$s)>;
+def : t2InstAlias<"rsb${s}${p} $Rdn, $Rm",
+           (t2RSBrr rGPR:$Rdn, rGPR:$Rdn, rGPR:$Rm, pred:$p, cc_out:$s)>;
+def : t2InstAlias<"rsb${s}${p} $Rdn, $ShiftedRm",
+           (t2RSBrs rGPR:$Rdn, rGPR:$Rdn, t2_so_reg:$ShiftedRm, pred:$p,
+                    cc_out:$s)>;
diff --git a/test/MC/ARM/basic-thumb2-instructions.s b/test/MC/ARM/basic-thumb2-instructions.s
index d9dc3bba5cf..671a5aa5523 100644
--- a/test/MC/ARM/basic-thumb2-instructions.s
+++ b/test/MC/ARM/basic-thumb2-instructions.s
@@ -1526,6 +1526,33 @@ _func:
 @ CHECK: rrxlt	r9, r12                 @ encoding: [0x4f,0xea,0x3c,0x09]
 @ CHECK: rrxsge	r8, r3                  @ encoding: [0x5f,0xea,0x33,0x08]
 
+@------------------------------------------------------------------------------
+@ RSB (immediate)
+@------------------------------------------------------------------------------
+        rsb r2, r5, #0xff000
+        rsbs r3, r12, #0xf
+        rsb r1, #0xff
+        rsb r1, r1, #0xff
+
+@ CHECK: rsb.w	r2, r5, #1044480        @ encoding: [0xc5,0xf5,0x7f,0x22]
+@ CHECK: rsbs.w	r3, r12, #15            @ encoding: [0xdc,0xf1,0x0f,0x03]
+@ CHECK: rsb.w	r1, r1, #255            @ encoding: [0xc1,0xf1,0xff,0x01]
+@ CHECK: rsb.w	r1, r1, #255            @ encoding: [0xc1,0xf1,0xff,0x01]
+
+
+@------------------------------------------------------------------------------
+@ RSB (register)
+@------------------------------------------------------------------------------
+        rsb r4, r8
+        rsb r4, r9, r8
+        rsb r1, r4, r8, asr #3
+        rsbs r2, r1, r7, lsl #1
+
+@ CHECK: rsb	r4, r4, r8              @ encoding: [0xc4,0xeb,0x08,0x04]
+@ CHECK: rsb	r4, r9, r8              @ encoding: [0xc9,0xeb,0x08,0x04]
+@ CHECK: rsb	r1, r4, r8, asr #3      @ encoding: [0xc4,0xeb,0xe8,0x01]
+@ CHECK: rsbs	r2, r1, r7, lsl #1      @ encoding: [0xd1,0xeb,0x47,0x02]
+
 
 @------------------------------------------------------------------------------
 @ SUB (register)