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- ; 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], [4 x i8]* @0, i32 0, i32 0), i32 %t18) nounwind
- ret i32 0
- }
- declare i32 @printf(i8* noalias nocapture, ...) nounwind
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