From fe3b2995aa38b25bada9fa2e850590b3988668b5 Mon Sep 17 00:00:00 2001
From: Arnold Schwaighofer <aschwaighofer@apple.com>
Date: Fri, 5 Jul 2013 18:57:49 +0000
Subject: [PATCH] ARM: Add a pack pattern for matching arithmetic shift right

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185714 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMInstrInfo.td |  3 +++
 test/CodeGen/ARM/pack.ll       | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/lib/Target/ARM/ARMInstrInfo.td b/lib/Target/ARM/ARMInstrInfo.td
index 75d3de94059..9eba5534238 100644
--- a/lib/Target/ARM/ARMInstrInfo.td
+++ b/lib/Target/ARM/ARMInstrInfo.td
@@ -4016,6 +4016,9 @@ def PKHTB : APKHI<0b01101000, 1, (outs GPRnopc:$Rd),
 def : ARMV6Pat<(or (and GPRnopc:$src1, 0xFFFF0000),
                    (srl GPRnopc:$src2, imm16:$sh)),
                (PKHTB GPRnopc:$src1, GPRnopc:$src2, imm16:$sh)>;
+def : ARMV6Pat<(or (and GPRnopc:$src1, 0xFFFF0000),
+                   (sra GPRnopc:$src2, imm16_31:$sh)),
+               (PKHTB GPRnopc:$src1, GPRnopc:$src2, imm16_31:$sh)>;
 def : ARMV6Pat<(or (and GPRnopc:$src1, 0xFFFF0000),
                    (and (srl GPRnopc:$src2, imm1_15:$sh), 0xFFFF)),
                (PKHTB GPRnopc:$src1, GPRnopc:$src2, imm1_15:$sh)>;
diff --git a/test/CodeGen/ARM/pack.ll b/test/CodeGen/ARM/pack.ll
index b94414328ca..f6cc75e04f0 100644
--- a/test/CodeGen/ARM/pack.ll
+++ b/test/CodeGen/ARM/pack.ll
@@ -99,3 +99,13 @@ entry:
     %tmp3 = or i32 %tmp, %tmp2
     ret i32 %tmp3
 }
+
+; CHECK: test10:
+; CHECK: pkhtb r0, r0, r1, asr #17
+define i32 @test10(i32 %src1, i32 %src2) {
+entry:
+    %tmp = and i32 %src1, -65536
+    %tmp2 = ashr i32 %src2, 17
+    %tmp3 = or i32 %tmp, %tmp2
+    ret i32 %tmp3
+}
-- 
2.34.1