1
; RUN: opt < %s -S -indvars | grep "= icmp" | count 3
4
; Indvars should be able to do range analysis and eliminate icmps.
5
; There are two here which cannot be eliminated.
6
; There's one that icmp which can be eliminated and which indvars currently
7
; cannot eliminate, because it requires analyzing more than just the
8
; range of the induction variable.
10
@0 = private constant [4 x i8] c"%d\0A\00", align 1 ; <[4 x i8]*> [#uses=1]
12
define i32 @main() nounwind {
16
bb1: ; preds = %bb14, %bb
17
%t = phi i32 [ 0, %bb ], [ %t19, %bb14 ] ; <i32> [#uses=5]
18
%t2 = phi i32 [ 0, %bb ], [ %t18, %bb14 ] ; <i32> [#uses=1]
19
%t3 = icmp slt i32 %t, 0 ; <i1> [#uses=1]
20
br i1 %t3, label %bb7, label %bb4
23
%t5 = icmp sgt i32 %t, 255 ; <i1> [#uses=1]
24
%t6 = select i1 %t5, i32 255, i32 %t ; <i32> [#uses=1]
27
bb7: ; preds = %bb4, %bb1
28
%t8 = phi i32 [ %t6, %bb4 ], [ 0, %bb1 ] ; <i32> [#uses=1]
29
%t9 = sub i32 0, %t ; <i32> [#uses=3]
30
%t10 = icmp slt i32 %t9, 0 ; <i1> [#uses=1]
31
br i1 %t10, label %bb14, label %bb11
34
%t12 = icmp sgt i32 %t9, 255 ; <i1> [#uses=1]
35
%t13 = select i1 %t12, i32 255, i32 %t9 ; <i32> [#uses=1]
38
bb14: ; preds = %bb11, %bb7
39
%t15 = phi i32 [ %t13, %bb11 ], [ 0, %bb7 ] ; <i32> [#uses=1]
40
%t16 = add nsw i32 %t2, 255 ; <i32> [#uses=1]
41
%t17 = add nsw i32 %t16, %t8 ; <i32> [#uses=1]
42
%t18 = add nsw i32 %t17, %t15 ; <i32> [#uses=2]
43
%t19 = add nsw i32 %t, 1 ; <i32> [#uses=2]
44
%t20 = icmp slt i32 %t19, 1000000000 ; <i1> [#uses=1]
45
br i1 %t20, label %bb1, label %bb21
48
%t22 = call i32 (i8*, ...) @printf(i8* noalias getelementptr inbounds ([4 x i8], [4 x i8]* @0, i32 0, i32 0), i32 %t18) nounwind
52
declare i32 @printf(i8* noalias nocapture, ...) nounwind