1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -simplifycfg -S | FileCheck %s
3
4; Reduced from arm_abs_q31() from CMSIS DSP suite.
5; https://reviews.llvm.org/D65148#1629010
6
7define i32 @abs_with_clamp(i32 %arg) {
8; CHECK-LABEL: @abs_with_clamp(
9; CHECK-NEXT:  begin:
10; CHECK-NEXT:    [[IS_POSITIVE:%.*]] = icmp sgt i32 [[ARG:%.*]], 0
11; CHECK-NEXT:    br i1 [[IS_POSITIVE]], label [[END:%.*]], label [[NEGATIVE:%.*]]
12; CHECK:       negative:
13; CHECK-NEXT:    [[IS_INT_MIN:%.*]] = icmp eq i32 [[ARG]], -2147483648
14; CHECK-NEXT:    [[NEGATED:%.*]] = sub nsw i32 0, [[ARG]]
15; CHECK-NEXT:    [[ABS:%.*]] = select i1 [[IS_INT_MIN]], i32 2147483647, i32 [[NEGATED]]
16; CHECK-NEXT:    br label [[END]]
17; CHECK:       end:
18; CHECK-NEXT:    [[TMP6:%.*]] = phi i32 [ [[ARG]], [[BEGIN:%.*]] ], [ [[ABS]], [[NEGATIVE]] ]
19; CHECK-NEXT:    ret i32 [[TMP6]]
20;
21begin:
22  %is_positive = icmp sgt i32 %arg, 0
23  br i1 %is_positive, label %end, label %negative
24
25negative: ; preds = %begin
26  %is_int_min = icmp eq i32 %arg, -2147483648
27  %negated = sub nsw i32 0, %arg
28  %abs = select i1 %is_int_min, i32 2147483647, i32 %negated
29  br label %end
30
31end:      ; preds = %negative, %begin
32  %tmp6 = phi i32 [ %arg, %begin ], [ %abs, %negative ]
33  ret i32 %tmp6
34}
35