1 ; RUN: llc -O2 -print-after-isel -mtriple=aarch64-linux-gnu %s -o /dev/null 2>&1 | FileCheck %s --check-prefixes=CHECK
3 ; This test function includes a 256-byte buffer. We expect it to require its
4 ; MTE tags to be set to a useful value on entry, and cleared again on exit. At
5 ; the time of writing this test, the pseudo-instructions chosen are
6 ; STGloop_wback and STGloop respectively, but if different pseudos are selected
7 ; in future, that's not a problem. The important thing is that both should
8 ; include that implicit-def of $nzcv, because these pseudo-instructions will
9 ; expand into loops that use the flags for their termination tests.
11 ; CHECK: STGloop_wback 256, {{.*}}, implicit-def dead $nzcv
12 ; CHECK: STGloop 256, {{.*}}, implicit-def dead $nzcv
14 define i32 @foo(i32 noundef %0) #0 {
15 %2 = alloca i32, align 4
16 %3 = alloca [256 x i8], align 1
17 %4 = alloca i64, align 8
18 %5 = alloca i32, align 4
19 %6 = alloca i64, align 8
20 store i32 %0, ptr %2, align 4
21 %7 = load i32, ptr %2, align 4
22 %8 = getelementptr inbounds [256 x i8], ptr %3, i64 0, i64 0
23 %9 = call i64 @read(i32 noundef %7, ptr noundef %8, i64 noundef 256)
24 store i64 %9, ptr %4, align 8
25 store i32 0, ptr %5, align 4
26 store i64 0, ptr %6, align 8
30 %11 = load i64, ptr %6, align 8
31 %12 = load i64, ptr %4, align 8
32 %13 = icmp ult i64 %11, %12
33 br i1 %13, label %14, label %24
36 %15 = load i64, ptr %6, align 8
37 %16 = getelementptr inbounds [256 x i8], ptr %3, i64 0, i64 %15
38 %17 = load i8, ptr %16, align 1
39 %18 = zext i8 %17 to i32
40 %19 = load i32, ptr %5, align 4
41 %20 = add nsw i32 %19, %18
42 store i32 %20, ptr %5, align 4
46 %22 = load i64, ptr %6, align 8
48 store i64 %23, ptr %6, align 8
52 %25 = load i32, ptr %5, align 4
53 %26 = srem i32 %25, 251
57 declare i64 @read(i32 noundef, ptr noundef, i64 noundef)
59 attributes #0 = { sanitize_memtag "target-features"="+mte" }