| Eric Christopher | cee313d | 2019-04-17 04:52:47 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -S -indvars | FileCheck %s |
| 2 | ; PR4914.ll |
| 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. |
| 9 | |
| 10 | @0 = private constant [4 x i8] c"%d\0A\00", align 1 ; <[4 x i8]*> [#uses=1] |
| 11 | |
| 12 | define i32 @main() nounwind { |
| 13 | ; CHECK-LABEL: @main( |
| 14 | ; CHECK: = icmp |
| 15 | ; CHECK: = icmp |
| 16 | ; CHECK: = icmp |
| 17 | ; CHECK-NOT: = icmp |
| 18 | bb: |
| 19 | br label %bb1 |
| 20 | |
| 21 | bb1: ; preds = %bb14, %bb |
| 22 | %t = phi i32 [ 0, %bb ], [ %t19, %bb14 ] ; <i32> [#uses=5] |
| 23 | %t2 = phi i32 [ 0, %bb ], [ %t18, %bb14 ] ; <i32> [#uses=1] |
| 24 | %t3 = icmp slt i32 %t, 0 ; <i1> [#uses=1] |
| 25 | br i1 %t3, label %bb7, label %bb4 |
| 26 | |
| 27 | bb4: ; preds = %bb1 |
| 28 | %t5 = icmp sgt i32 %t, 255 ; <i1> [#uses=1] |
| 29 | %t6 = select i1 %t5, i32 255, i32 %t ; <i32> [#uses=1] |
| 30 | br label %bb7 |
| 31 | |
| 32 | bb7: ; preds = %bb4, %bb1 |
| 33 | %t8 = phi i32 [ %t6, %bb4 ], [ 0, %bb1 ] ; <i32> [#uses=1] |
| 34 | %t9 = sub i32 0, %t ; <i32> [#uses=3] |
| 35 | %t10 = icmp slt i32 %t9, 0 ; <i1> [#uses=1] |
| 36 | br i1 %t10, label %bb14, label %bb11 |
| 37 | |
| 38 | bb11: ; preds = %bb7 |
| 39 | %t12 = icmp sgt i32 %t9, 255 ; <i1> [#uses=1] |
| 40 | %t13 = select i1 %t12, i32 255, i32 %t9 ; <i32> [#uses=1] |
| 41 | br label %bb14 |
| 42 | |
| 43 | bb14: ; preds = %bb11, %bb7 |
| 44 | %t15 = phi i32 [ %t13, %bb11 ], [ 0, %bb7 ] ; <i32> [#uses=1] |
| 45 | %t16 = add nsw i32 %t2, 255 ; <i32> [#uses=1] |
| 46 | %t17 = add nsw i32 %t16, %t8 ; <i32> [#uses=1] |
| 47 | %t18 = add nsw i32 %t17, %t15 ; <i32> [#uses=2] |
| 48 | %t19 = add nsw i32 %t, 1 ; <i32> [#uses=2] |
| 49 | %t20 = icmp slt i32 %t19, 1000000000 ; <i1> [#uses=1] |
| 50 | br i1 %t20, label %bb1, label %bb21 |
| 51 | |
| 52 | bb21: ; preds = %bb14 |
| 53 | %t22 = call i32 (i8*, ...) @printf(i8* noalias getelementptr inbounds ([4 x i8], [4 x i8]* @0, i32 0, i32 0), i32 %t18) nounwind |
| 54 | ret i32 0 |
| 55 | } |
| 56 | |
| 57 | declare i32 @printf(i8* noalias nocapture, ...) nounwind |