1; RUN: opt -S -instcombine < %s | FileCheck %s
2
3target triple = "x86_64-apple-macosx10.6.6"
4
5define zeroext i16 @foo1(i32 %on_off) {
6; CHECK-LABEL: @foo1(
7; CHECK-NEXT:    [[ON_OFF_TR:%.*]] = trunc i32 %on_off to i16
8; CHECK-NEXT:    [[TMP1:%.*]] = shl i16 [[ON_OFF_TR]], 1
9; CHECK-NEXT:    [[CONV:%.*]] = add i16 [[TMP1]], -2
10; CHECK-NEXT:    ret i16 [[CONV]]
11;
12  %on_off.addr = alloca i32, align 4
13  %a = alloca i32, align 4
14  store i32 %on_off, i32* %on_off.addr, align 4
15  %tmp = load i32, i32* %on_off.addr, align 4
16  %sub = sub i32 1, %tmp
17  %mul = mul i32 %sub, -2
18  store i32 %mul, i32* %a, align 4
19  %tmp1 = load i32, i32* %a, align 4
20  %conv = trunc i32 %tmp1 to i16
21  ret i16 %conv
22}
23
24define zeroext i16 @foo2(i32 %on_off, i32 %q) {
25; CHECK-LABEL: @foo2(
26; CHECK-NEXT:    [[SUBA:%.*]] = sub i32 %on_off, %q
27; CHECK-NEXT:    [[SUBA_TR:%.*]] = trunc i32 [[SUBA]] to i16
28; CHECK-NEXT:    [[CONV:%.*]] = shl i16 [[SUBA_TR]], 2
29; CHECK-NEXT:    ret i16 [[CONV]]
30;
31  %on_off.addr = alloca i32, align 4
32  %q.addr = alloca i32, align 4
33  %a = alloca i32, align 4
34  store i32 %on_off, i32* %on_off.addr, align 4
35  store i32 %q, i32* %q.addr, align 4
36  %tmp = load i32, i32* %q.addr, align 4
37  %tmp1 = load i32, i32* %on_off.addr, align 4
38  %sub = sub i32 %tmp, %tmp1
39  %mul = mul i32 %sub, -4
40  store i32 %mul, i32* %a, align 4
41  %tmp2 = load i32, i32* %a, align 4
42  %conv = trunc i32 %tmp2 to i16
43  ret i16 %conv
44}
45
46define zeroext i16 @foo3(i32 %on_off) {
47; CHECK-LABEL: @foo3(
48; CHECK-NEXT:    [[ON_OFF_TR:%.*]] = trunc i32 %on_off to i16
49; CHECK-NEXT:    [[TMP1:%.*]] = shl i16 [[ON_OFF_TR]], 2
50; CHECK-NEXT:    [[CONV:%.*]] = add i16 [[TMP1]], -28
51; CHECK-NEXT:    ret i16 [[CONV]]
52;
53  %on_off.addr = alloca i32, align 4
54  %a = alloca i32, align 4
55  store i32 %on_off, i32* %on_off.addr, align 4
56  %tmp = load i32, i32* %on_off.addr, align 4
57  %sub = sub i32 7, %tmp
58  %mul = mul i32 %sub, -4
59  store i32 %mul, i32* %a, align 4
60  %tmp1 = load i32, i32* %a, align 4
61  %conv = trunc i32 %tmp1 to i16
62  ret i16 %conv
63}
64
65