1; ModuleID = 'test1.c'
2; RUN: opt -S -instcombine < %s | FileCheck %s
3target triple = "x86_64-apple-macosx10.6.6"
4
5define zeroext i16 @foo1(i32 %on_off) nounwind uwtable ssp {
6entry:
7  %on_off.addr = alloca i32, align 4
8  %a = alloca i32, align 4
9  store i32 %on_off, i32* %on_off.addr, align 4
10  %tmp = load i32, i32* %on_off.addr, align 4
11  %sub = sub i32 1, %tmp
12; CHECK-NOT: mul i32
13  %mul = mul i32 %sub, -2
14; CHECK: shl
15; CHECK-NEXT: add
16  store i32 %mul, i32* %a, align 4
17  %tmp1 = load i32, i32* %a, align 4
18  %conv = trunc i32 %tmp1 to i16
19  ret i16 %conv
20}
21
22define zeroext i16 @foo2(i32 %on_off, i32 %q) nounwind uwtable ssp {
23entry:
24  %on_off.addr = alloca i32, align 4
25  %q.addr = alloca i32, align 4
26  %a = alloca i32, align 4
27  store i32 %on_off, i32* %on_off.addr, align 4
28  store i32 %q, i32* %q.addr, align 4
29  %tmp = load i32, i32* %q.addr, align 4
30  %tmp1 = load i32, i32* %on_off.addr, align 4
31  %sub = sub i32 %tmp, %tmp1
32; CHECK-NOT: mul i32
33  %mul = mul i32 %sub, -4
34; CHECK: sub i32
35; CHECK-NEXT: shl
36  store i32 %mul, i32* %a, align 4
37  %tmp2 = load i32, i32* %a, align 4
38  %conv = trunc i32 %tmp2 to i16
39  ret i16 %conv
40}
41
42define zeroext i16 @foo3(i32 %on_off) nounwind uwtable ssp {
43entry:
44  %on_off.addr = alloca i32, align 4
45  %a = alloca i32, align 4
46  store i32 %on_off, i32* %on_off.addr, align 4
47  %tmp = load i32, i32* %on_off.addr, align 4
48  %sub = sub i32 7, %tmp
49; CHECK-NOT: mul i32
50  %mul = mul i32 %sub, -4
51; CHECK: shl
52; CHECK-NEXT: add
53  store i32 %mul, i32* %a, align 4
54  %tmp1 = load i32, i32* %a, align 4
55  %conv = trunc i32 %tmp1 to i16
56  ret i16 %conv
57}
58