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