1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
2; RUN: opt -passes=indvars -S %s | FileCheck %s
3
4target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128-Fn32"
5
6define void @rewrite_preserve_add_nsw(i32 %a) {
7; CHECK-LABEL: define void @rewrite_preserve_add_nsw(
8; CHECK-SAME: i32 [[A:%.*]]) {
9; CHECK-NEXT:  entry:
10; CHECK-NEXT:    [[ADD:%.*]] = add nsw i32 [[A]], 4
11; CHECK-NEXT:    call void @use(i32 noundef [[ADD]])
12; CHECK-NEXT:    [[PRE:%.*]] = icmp sgt i32 [[A]], -4
13; CHECK-NEXT:    br i1 [[PRE]], label [[LOOP_PREHEADER:%.*]], label [[EXIT:%.*]]
14; CHECK:       loop.preheader:
15; CHECK-NEXT:    [[TMP0:%.*]] = add i32 [[A]], 5
16; CHECK-NEXT:    br label [[LOOP:%.*]]
17; CHECK:       loop:
18; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ]
19; CHECK-NEXT:    call void @clobber()
20; CHECK-NEXT:    [[IV_NEXT]] = add nuw i32 [[IV]], 1
21; CHECK-NEXT:    [[EC:%.*]] = icmp ne i32 [[IV_NEXT]], [[TMP0]]
22; CHECK-NEXT:    br i1 [[EC]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
23; CHECK:       exit.loopexit:
24; CHECK-NEXT:    br label [[EXIT]]
25; CHECK:       exit:
26; CHECK-NEXT:    ret void
27;
28entry:
29  %add = add nsw i32 %a, 4
30  call void @use(i32 noundef %add)
31  %pre = icmp sgt i32 %a, -4
32  br i1 %pre, label %loop, label %exit
33
34loop:
35  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
36  call void @clobber()
37  %iv.next = add i32 %iv, 1
38  %ec = icmp slt i32 %iv, %add
39  br i1 %ec, label %loop, label %exit
40
41exit:
42  ret void
43}
44
45declare void @clobber()
46declare void @use(i32)
47