1; RUN: opt -analyze -scalar-evolution < %s | FileCheck %s
2
3; CHECK: Loop %bb1: backedge-taken count is ((2 * %a.promoted) /u 2)
4
5target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
6target triple = "x86_64-apple-macosx10.10.0"
7
8@a = global i8 -127, align 1
9@b = common global i32 0, align 4
10
11declare void @use(i32)
12
13define i32 @main() {
14bb:
15  %a.promoted = load i8, i8* @a
16  br label %bb1
17
18bb1:                                              ; preds = %bb1, %bb
19  %tmp = phi i8 [ %tmp2, %bb1 ], [ %a.promoted, %bb ]
20  %tmp2 = add i8 %tmp, -1
21  %tmp3 = sext i8 %tmp to i32
22  %tmp4 = xor i32 %tmp3, -1
23  %tmp5 = sext i8 %tmp2 to i32
24  %tmpf = sub nsw i32 %tmp4, %tmp5
25  %tmp6 = trunc i32 %tmpf to i8
26  %tmp7 = icmp eq i8 %tmp6, 0
27  br i1 %tmp7, label %bb8, label %bb1
28
29bb8:                                              ; preds = %bb1
30  store i8 %tmp2, i8* @a
31  store i32 %tmp4, i32* @b
32  %tmp9 = sext i8 %tmp2 to i32
33  call void @use(i32 %tmp9)
34  ret i32 0
35}
36