; RUN: llc -O2 -print-after-isel -mtriple=aarch64-linux-gnu %s -o /dev/null 2>&1 | FileCheck %s --check-prefixes=CHECK
; This test function includes a 256-byte buffer. We expect it to require its
; MTE tags to be set to a useful value on entry, and cleared again on exit. At
; the time of writing this test, the pseudo-instructions chosen are
; STGloop_wback and STGloop respectively, but if different pseudos are selected
; in future, that's not a problem. The important thing is that both should
; include that implicit-def of $nzcv, because these pseudo-instructions will
; expand into loops that use the flags for their termination tests.
; CHECK: STGloop_wback 256, {{.*}}, implicit-def dead $nzcv
; CHECK: STGloop 256, {{.*}}, implicit-def dead $nzcv
define i32 @foo(i32 noundef %0) #0 {
%2 = alloca i32, align 4
%3 = alloca [256 x i8], align 1
%4 = alloca i64, align 8
%5 = alloca i32, align 4
%6 = alloca i64, align 8
store i32 %0, ptr %2, align 4
%7 = load i32, ptr %2, align 4
%8 = getelementptr inbounds [256 x i8], ptr %3, i64 0, i64 0
%9 = call i64 @read(i32 noundef %7, ptr noundef %8, i64 noundef 256)
store i64 %9, ptr %4, align 8
store i32 0, ptr %5, align 4
store i64 0, ptr %6, align 8
br label %10
10: ; preds = %21, %1
%11 = load i64, ptr %6, align 8
%12 = load i64, ptr %4, align 8
%13 = icmp ult i64 %11, %12
br i1 %13, label %14, label %24
14: ; preds = %10
%15 = load i64, ptr %6, align 8
%16 = getelementptr inbounds [256 x i8], ptr %3, i64 0, i64 %15
%17 = load i8, ptr %16, align 1
%18 = zext i8 %17 to i32
%19 = load i32, ptr %5, align 4
%20 = add nsw i32 %19, %18
store i32 %20, ptr %5, align 4
br label %21
21: ; preds = %14
%22 = load i64, ptr %6, align 8
%23 = add i64 %22, 1
store i64 %23, ptr %6, align 8
br label %10
24: ; preds = %10
%25 = load i32, ptr %5, align 4
%26 = srem i32 %25, 251
ret i32 %26
}
declare i64 @read(i32 noundef, ptr noundef, i64 noundef)
attributes #0 = { sanitize_memtag "target-features"="+mte" }
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