| ; RUN: opt < %s -S -indvars | grep "= icmp" | count 3 |
| ; PR4914.ll |
| |
| ; Indvars should be able to do range analysis and eliminate icmps. |
| ; There are two here which cannot be eliminated. |
| ; There's one that icmp which can be eliminated and which indvars currently |
| ; cannot eliminate, because it requires analyzing more than just the |
| ; range of the induction variable. |
| |
| @0 = private constant [4 x i8] c"%d\0A\00", align 1 ; <[4 x i8]*> [#uses=1] |
| |
| define i32 @main() nounwind { |
| bb: |
| br label %bb1 |
| |
| bb1: ; preds = %bb14, %bb |
| %t = phi i32 [ 0, %bb ], [ %t19, %bb14 ] ; <i32> [#uses=5] |
| %t2 = phi i32 [ 0, %bb ], [ %t18, %bb14 ] ; <i32> [#uses=1] |
| %t3 = icmp slt i32 %t, 0 ; <i1> [#uses=1] |
| br i1 %t3, label %bb7, label %bb4 |
| |
| bb4: ; preds = %bb1 |
| %t5 = icmp sgt i32 %t, 255 ; <i1> [#uses=1] |
| %t6 = select i1 %t5, i32 255, i32 %t ; <i32> [#uses=1] |
| br label %bb7 |
| |
| bb7: ; preds = %bb4, %bb1 |
| %t8 = phi i32 [ %t6, %bb4 ], [ 0, %bb1 ] ; <i32> [#uses=1] |
| %t9 = sub i32 0, %t ; <i32> [#uses=3] |
| %t10 = icmp slt i32 %t9, 0 ; <i1> [#uses=1] |
| br i1 %t10, label %bb14, label %bb11 |
| |
| bb11: ; preds = %bb7 |
| %t12 = icmp sgt i32 %t9, 255 ; <i1> [#uses=1] |
| %t13 = select i1 %t12, i32 255, i32 %t9 ; <i32> [#uses=1] |
| br label %bb14 |
| |
| bb14: ; preds = %bb11, %bb7 |
| %t15 = phi i32 [ %t13, %bb11 ], [ 0, %bb7 ] ; <i32> [#uses=1] |
| %t16 = add nsw i32 %t2, 255 ; <i32> [#uses=1] |
| %t17 = add nsw i32 %t16, %t8 ; <i32> [#uses=1] |
| %t18 = add nsw i32 %t17, %t15 ; <i32> [#uses=2] |
| %t19 = add nsw i32 %t, 1 ; <i32> [#uses=2] |
| %t20 = icmp slt i32 %t19, 1000000000 ; <i1> [#uses=1] |
| br i1 %t20, label %bb1, label %bb21 |
| |
| bb21: ; preds = %bb14 |
| %t22 = call i32 (i8*, ...)* @printf(i8* noalias getelementptr inbounds ([4 x i8]* @0, i32 0, i32 0), i32 %t18) nounwind |
| ret i32 0 |
| } |
| |
| declare i32 @printf(i8* noalias nocapture, ...) nounwind |
