derek.holloway
7502bf64a4
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42 lines
1.9 KiB
LLVM
42 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
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; RUN: opt < %s -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Previously in this case the max backedge count would be computed as 1/0, which
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; is correct but undesirable. It would also not fold as a constant, tripping
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; asserts in SCEV.
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define void @pluto(i32 %arg) {
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; CHECK-LABEL: 'pluto'
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; CHECK-NEXT: Classifying expressions for: @pluto
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; CHECK-NEXT: %tmp = ashr i32 %arg, 31
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; CHECK-NEXT: --> %tmp U: [-1,1) S: [-1,1)
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; CHECK-NEXT: %tmp1 = add nsw i32 %tmp, 2
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; CHECK-NEXT: --> (2 + %tmp)<nsw> U: [1,3) S: [1,3)
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; CHECK-NEXT: %tmp3 = phi i32 [ 0, %bb ], [ %tmp4, %bb2 ]
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; CHECK-NEXT: --> {0,+,(2 + %tmp)<nsw>}<nuw><nsw><%bb2> U: [0,3) S: [0,3) Exits: ((2 + %tmp)<nsw> * (1 /u (2 + %tmp)<nsw>))<nuw> LoopDispositions: { %bb2: Computable }
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; CHECK-NEXT: %tmp4 = add nuw nsw i32 %tmp1, %tmp3
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; CHECK-NEXT: --> {(2 + %tmp)<nsw>,+,(2 + %tmp)<nsw>}<nuw><nsw><%bb2> U: [1,5) S: [1,5) Exits: (2 + ((2 + %tmp)<nsw> * (1 /u (2 + %tmp)<nsw>))<nuw> + %tmp) LoopDispositions: { %bb2: Computable }
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; CHECK-NEXT: Determining loop execution counts for: @pluto
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; CHECK-NEXT: Loop %bb2: backedge-taken count is (1 /u (2 + %tmp)<nsw>)
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; CHECK-NEXT: Loop %bb2: constant max backedge-taken count is i32 1
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; CHECK-NEXT: Loop %bb2: symbolic max backedge-taken count is (1 /u (2 + %tmp)<nsw>)
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; CHECK-NEXT: Loop %bb2: Trip multiple is 1
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;
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bb:
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%tmp = ashr i32 %arg, 31
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%tmp1 = add nsw i32 %tmp, 2
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br label %bb2
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bb2: ; preds = %bb2, %bb
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%tmp3 = phi i32 [ 0, %bb ], [ %tmp4, %bb2 ]
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%tmp4 = add nuw nsw i32 %tmp1, %tmp3
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%tmp5 = icmp ult i32 %tmp4, 2
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br i1 %tmp5, label %bb2, label %bb6
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bb6: ; preds = %bb2
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ret void
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}
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