Currently there is a pattern for the thumb-2 MOV 16-bit immediate instruction. That instruction cannot write the flags so it should use T2I instead of T2sI.

Also, added a pattern for the thumb-2 MOV of shifted immediate since that can encode immediates not encodable by the 16-bit immediate.

llvm-svn: 74288

llvm/lib/Target/ARM/ARMInstrThumb2.td

@@ -409,9 +409,14 @@ def t2MOVr : T2sI<(outs GPR:$dst), (ins GPR:$src),
                    "mov", " $dst, $src", []>;
 
 let isReMaterializable = 1, isAsCheapAsAMove = 1 in
-def t2MOVi16 : T2sI<(outs GPR:$dst), (ins i32imm:$src),
-                    "movw", " $dst, $src",
-                    [(set GPR:$dst, imm0_65535:$src)]>;
+def t2MOVi : T2sI<(outs GPR:$dst), (ins t2_so_imm:$src),
+                   "mov", " $dst, $src",
+                   [(set GPR:$dst, t2_so_imm:$src)]>;
+
+let isReMaterializable = 1, isAsCheapAsAMove = 1 in
+def t2MOVi16 : T2I<(outs GPR:$dst), (ins i32imm:$src),
+                   "movw", " $dst, $src",
+                   [(set GPR:$dst, imm0_65535:$src)]>;
 
 // FIXME: Also available in ARM mode.
 let Constraints = "$src = $dst" in

llvm/test/CodeGen/Thumb2/thumb2-mov3.ll

@@ -0,0 +1,33 @@
+; RUN: llvm-as < %s | llc | grep {mov\\W*r\[0-9\],\\W*#\[0-9\]*} | grep {#171\\|#1179666\\|#872428544\\|#1448498774\\|#66846720} | Count 5
+
+target triple = "thumbv7-apple-darwin"
+
+; 171 = 0x000000ab
+define i32 @f1(i32 %a) {
+    %tmp = add i32 0, 171
+    ret i32 %tmp
+}
+
+; 1179666 = 0x00120012
+define i32 @f2(i32 %a) {
+    %tmp = add i32 0, 1179666
+    ret i32 %tmp
+}
+
+; 872428544 = 0x34003400
+define i32 @f3(i32 %a) {
+    %tmp = add i32 0, 872428544
+    ret i32 %tmp
+}
+
+; 1448498774 = 0x56565656
+define i32 @f4(i32 %a) {
+    %tmp = add i32 0, 1448498774
+    ret i32 %tmp
+}
+
+; 66846720 = 0x03fc0000
+define i32 @f5(i32 %a) {
+    %tmp = add i32 0, 66846720
+    ret i32 %tmp
+}

llvm/test/CodeGen/Thumb2/thumb2-mov4.ll

@@ -0,0 +1,8 @@
+; RUN: llvm-as < %s | llc | grep {movw\\W*r\[0-9\],\\W*#\[0-9\]*} | grep {#65535} | Count 1
+
+target triple = "thumbv7-apple-darwin"
+
+define i32 @f6(i32 %a) {
+    %tmp = add i32 0, 65535
+    ret i32 %tmp
+}