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1; RUN: llc < %s -march=thumb -mattr=+v6 | FileCheck %s
2
3define i32 @test1(i32 %X) nounwind {
4; CHECK: test1
5; CHECK: rev16 r0, r0
6        %tmp1 = lshr i32 %X, 8
7        %X15 = bitcast i32 %X to i32
8        %tmp4 = shl i32 %X15, 8
9        %tmp2 = and i32 %tmp1, 16711680
10        %tmp5 = and i32 %tmp4, -16777216
11        %tmp9 = and i32 %tmp1, 255
12        %tmp13 = and i32 %tmp4, 65280
13        %tmp6 = or i32 %tmp5, %tmp2
14        %tmp10 = or i32 %tmp6, %tmp13
15        %tmp14 = or i32 %tmp10, %tmp9
16        ret i32 %tmp14
17}
18
19define i32 @test2(i32 %X) nounwind {
20; CHECK: test2
21; CHECK: revsh r0, r0
22        %tmp1 = lshr i32 %X, 8
23        %tmp1.upgrd.1 = trunc i32 %tmp1 to i16
24        %tmp3 = trunc i32 %X to i16
25        %tmp2 = and i16 %tmp1.upgrd.1, 255
26        %tmp4 = shl i16 %tmp3, 8
27        %tmp5 = or i16 %tmp2, %tmp4
28        %tmp5.upgrd.2 = sext i16 %tmp5 to i32
29        ret i32 %tmp5.upgrd.2
30}
31
32; rdar://9147637
33define i32 @test3(i16 zeroext %a) nounwind {
34entry:
35; CHECK: test3:
36; CHECK: revsh r0, r0
37  %0 = tail call i16 @llvm.bswap.i16(i16 %a)
38  %1 = sext i16 %0 to i32
39  ret i32 %1
40}
41
42declare i16 @llvm.bswap.i16(i16) nounwind readnone
43
44define i32 @test4(i16 zeroext %a) nounwind {
45entry:
46; CHECK: test4:
47; CHECK: revsh r0, r0
48  %conv = zext i16 %a to i32
49  %shr9 = lshr i16 %a, 8
50  %conv2 = zext i16 %shr9 to i32
51  %shl = shl nuw nsw i32 %conv, 8
52  %or = or i32 %conv2, %shl
53  %sext = shl i32 %or, 16
54  %conv8 = ashr exact i32 %sext, 16
55  ret i32 %conv8
56}
57